US 20060033216 A1
A stacked chip assembly includes individual units having chips mounted on dielectric layers and traces on the dielectric layers interconnecting the contacts of the chips with terminals disposed in peripheral regions of the dielectric layers. At least some of the traces are multi-branched traces which connect chip select contacts to chip select terminals. The units are stacked one above the other with corresponding terminals of the different units being connected to one another by solder balls or other conductive elements so as to form vertical buses. Prior to stacking, the multi-branched traces of the individual units are selectively connected, as by forming solder bridges, so as to leave chip select contacts of chips in different units connected to different chip select terminals and thereby connect these chips to different vertical buses. The individual units desirably are thin and directly abut one another so as to provide a low-height assembly with good heat transfer from chips within the stack.
1. A method of making semiconductor chip assembly comprising the steps of:
(a) stacking a plurality of units each including at least one semiconductor chip having at least one chip select contact and a plurality of other contacts and a circuit panel having a plurality of chip select terminals, a plurality of other terminals, and traces extending on or in the panel connected to said terminals, said traces of each panel including a plurality of traces connecting said other contacts with said other terminals, at least one trace of each said panel being a multi-branched trace associated with plurality of said chip select terminals on such panel, each such multi-branched trace including a common section and a plurality of branches, each one of the plurality of branches being associated with one said chip select terminals, each one of said branches defining a gap intervening between the common section of the trace incorporating such branch and the terminal associated with such branch;
(b) selectively connecting a bridging conductive element across the gap defined by at least one branch, but less than all branches, of each such multi-branched trace, whereby the common section of each multi-branched trace is connected to less than all of the chip select terminals associated with the branches of such multi-branched trace; and
(c) interconnecting terminals of different units to one another to form vertical buses, said selectively connecting and interconnecting steps being performed so that the chip select contacts of chips in different units are connected to different ones of said vertical buses.
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17. A method of making connections between conductive elements on a circuit panel comprising the steps:
(a) squeezing a mass of an electrically conductive material between a tool and a pair of electrically conductive elements exposed at a top surface of the circuit panel and defining a gap therebetween while applying sonic energy to said mass so as to bond said mass to both of said conductive elements; and then
(b) retracting said tool so as to leave said mass bridging the gap between said conductive elements.
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This application is divisional application of U.S. patent application Ser. No. 10/454,029, filed Jun. 4, 2003, which application is a continuation-in-part of U.S. patent application Ser. No. 10/267,450, filed Oct. 9, 2002, now U.S. Pat. No. 6,897,565, which in turn claims benefit of the filing date of U.S. Provisional Patent Application Ser. No. 60/328,038 filed Oct. 9, 2001. The disclosures of the aforementioned applications are hereby incorporated by reference herein.
The present application relates to microelectronic assemblies and, in particular, to stacked packages, and to components and methods useful in making such assemblies.
Semiconductor chips typically are thin and flat, with relatively large front and rear surfaces and small edge surfaces. The chips have contacts on their front surfaces. Typically, chips are provided as packaged chips having terminals suitable for connection to an external circuit. Packaged chips typically are also in the form of flat bodies. Ordinarily, the packaged chips are arranged in an array on a surface of a circuit board. The circuit board has electrical conductors, normally referred to as “traces” extending in horizontal directions parallel to the surface of the circuit board and also has contact pads or other electrically conductive elements connected to the traces. The packaged chips are mounted with their terminal-bearing faces confronting the surface of the circuit board and the terminals on each packaged chip are electrically connected to the contact pads of the circuit board.
Memory chips typically are mounted in this manner. An unpackaged memory chip typically has numerous data contacts and one or a few select contacts. The chip is arranged to ignore data or commands appearing at the data terminals unless the appropriate signals are applied to the select contact or contacts. A conventional packaged memory chip has data terminals connected to the data contacts and has select terminals connected to the select contacts. In a conventional system, numerous identical packaged memory chips can be connected in an array with the corresponding data terminals of the various packaged chips connected to common traces and with the select terminals of the various chips connected to unique conductors, so that each conductor is associated with one, and only one, chip. Data can be written onto an individual chip by supplying the data on the common traces and by applying a selection signal on the unique trace associated with the particular chip where the data is to be written. The remaining chips will ignore the data. The reverse process is employed to read data from a particular chip. Such a circuit can be built readily using the conventional horizontal chip array and using identical chip packages for all of the chips in the array.
In the conventional arrangement, the theoretical minimum area of the circuit board is equal to the aggregate areas of all of the terminal-bearing surfaces of the individual chip packages. In practice, the circuit board must be somewhat larger than this theoretical minimum. The traces on the circuit board typically have significant length and impedance so that appreciable time is required for propagation of signals along the traces. This limits the speed of operation of the circuit.
Various approaches have been proposed for alleviating these drawbacks. One such approach is to “stack” plural chips one above the other in a common package. The package itself has vertically-extending conductors that are connected to the contact pads of the circuit board. The individual chips within the package are connected to these vertically-extending conductors. Because the thickness of a chip is substantially smaller than its horizontal dimensions, the internal conductors can be shorter than the traces on a circuit board that would be required to connect the same number of chips in a conventional arrangement. Examples of stacked packages are shown, for example, in U.S. Pat. Nos. 5,861,666; 5,198,888; 4,956,694; 6,072,233; and 6,268,649. The stacked packages shown in certain embodiments of these patents are made by providing individual units, each including a single chip and a package element having unit terminals. Within each unit, the contacts of the chip are connected to the unit terminals. The units are stacked one atop the other. Unit terminals of each unit are connected to the corresponding unit terminals of other units. The connected unit terminals form vertical conductors of the stacked package, also referred to as buses.
However, providing a circuit with individual select connections in a stacked package introduces additional complexities. Because the vertical conductors extend through the terminals of the various units, the interconnections between the contacts of the chip and the unit terminals of each unit in the stack should be different in order to provide connections to unique vertical conductors. For example, in a four-chip stack having four vertical buses for carrying selection signals, the bottom unit may have a select contact of its chip connected to a unit terminal that forms part of bus number 1; the next unit may have a corresponding select contact of its chip connected to a terminal that forms bus number 2; and so on. This need for customization of the units adds complexity to the manufacturing process. For example, U.S. Pat. No. 4,956,694 describes units having chip carriers with a set of intermediate terminals in each unit. These intermediate terminals are connected to the contacts on the chip and are also connected to the terminals of the unit. The interconnections are made by wire bonds. The pattern of wire bonds differs from unit to unit. This arrangement inherently requires a relatively large chip carrier, which adds to the cost and bulk of the package. Moreover, the manufacturer must handle and stock multiple different wire bonded units. Sugano et al., U.S. Pat. No. 5,198,888, uses individualized chip carriers in the various units. These chip carriers have leads defining different interconnect patterns for the select contacts and the associated terminals. This, again, adds to the cost and complexity of the manufacturing process. U.S. Pat. Nos. 6,268,649 and 6,072,233 use customized units as well. It would be desirable to reduce the cost and complexity associated with providing customized units in a stacked package.
It would also be desirable to provide a compact stacked package and to provide a stacked package with good heat transfer from the chips within the stack to the external environment as, for example, to the circuit board or to a heat spreader overlying the top of the package. Further, it would be desirable to provide such a package using readily-available equipment and using components that can be fabricated readily.
In addition, it would be desirable to provide a stacked package that mitigates signal noise and distortion. As such, it would also be desirable to shield other components external to the stacked package from electromagnetic radiation emanating from the stacked package. Likewise, it would also be desirable to shield the chips, or devices, of a stacked package from external electromagnetic radiation impinging thereon.
One aspect of the invention provides semiconductor chip assemblies incorporating a plurality of units. Each unit desirably includes a semiconductor chip having at least one select contact and a plurality of other contacts and also includes a circuit panel having a plurality of chip select terminals and a plurality of other terminals, as well as traces extending on or in the panel. The traces are electrically connected between the contacts of the chip and the terminals. The trace electrically connected to each chip select contact of the chip desirably is a multi-branched trace including a common section connected to the select contact of the chip and also including a plurality of branches connected to different ones of the chip select terminals on the circuit panel. In the assembly, desirably at least one branch, but less than all of the branches of each such multi-branch trace, have an interruption therein so that the select contact is connected to less than all of the chip select terminals on the panel and most preferably so that each chip select contact is connected to only one chip select terminal of the panel in the unit. The units are disposed one above the other in a stack of superposed units. The assembly further includes vertical conductors, each connecting the corresponding terminals of the units in the stack to one another so as to form a plurality of vertical buses. Due to the selective connections within individual units provided by the multi-branch traces and interrupted branches, the chip select contacts of chips in different units are electrically connected to different ones of the vertical buses. This arrangement provides selective routing of chip select signals and other signals which must be conveyed to individual chips. The remaining contacts on each chip are connected in parallel with corresponding contacts on chips in other units so that signals can be conveyed to the remaining contacts of the various chips in parallel. This provides the required selective routing.
Most preferably, the chips, traces and terminals of different units in the stack are identical to one another, except that different ones of the units have different branches of their multi-branch traces interrupted so that different chip select contacts of different units are connected to different terminals on the circuit panels of such units. Most preferably, the circuit panel of each unit includes a dielectric layer, desirably less than about 100 μm thick. The vertical spacing distance between corresponding features in adjacent ones of the units desirably is no more than about 250 μm and preferably no more than about 200 μm greater than the thickness of the chip in each unit. The assembly, thus, has a relatively low overall height.
The dielectric layer in each circuit panel may have a disconnection aperture or opening, and the interruptions in the branches of the multi-branch traces may be formed at such disconnection apertures. The disconnection apertures can be formed in the dielectric layers when the units are manufactured or when the branches are interrupted, typically at a later stage in the process. In one arrangement, the circuit panel of each unit has edges, and the disconnection apertures are provided in the form of notches extending inwardly from one or more of the edges. The terminals of such a unit may include an outer row disposed adjacent to an edge of the circuit panel and the branches of the multi-branch traces may have portions extending outwardly to or beyond the outer row of terminals. In this instance, the notches need not extend inwardly beyond the outer row of terminals, so that the interruptions in the multi-branch leads can be formed readily.
Alternatively, or in combination with the above, the branches of a multi-branch trace may define gaps such that the gaps intervene between the common section of the multi-branch trace and the select terminals associated with the various branches. Selective connections may be formed across such one or more of the gaps by conductive elements such as wire bonds or solder masses so as to connect one or of the select terminals to the common section. For example, the gaps can be bridged using solder applied in the package assembly plant with the same equipment as is used to form vertical buses between the various units. Here again, the various units may be identical to one another until the time the solder is applied, thus simplifying handling and stocking of the units.
A further aspect of the invention provides methods of making a semiconductor chip assembly. A method according to this aspect of the invention includes the step of providing a plurality of units. Here again, each unit desirably includes at least one semiconductor chip having at least one chip select contact and a plurality of other contacts and also includes a circuit panel having chip select terminals, other terminals and traces extending on or in the panel connected to the terminals. As discussed above, at least one trace of each panel desirably is a multi-branch trace including a common section and plural branches connected to different ones of the chip select terminals, and the contacts of the at least one chip in each unit desirably are connected to the traces of the circuit panel in that unit so that the chip select contacts are connected to the common sections of the multi-branch traces. The method according to this aspect of the invention desirably includes the step of selectively interrupting the branches of the multi-branch traces so that the common section of a multi-branch trace in each unit is connected to less than all of the chip select terminals of that unit. The method preferably includes the step of stacking the units and interconnecting terminals of different units to one another to form vertical buses.
The selectively interrupting step desirably is performed so that the chip select terminals of chips in different units are connected to different ones of the vertical buses. Most preferably, prior to the step of selectively interrupting the multi-branch traces, the units are substantially identical to one another. The step of selectively interrupting the multi-branch traces may be performed at any time during or after formation of the units. In one arrangement, the step of providing the units includes connecting the chips to the traces using a tool such as a thermosonic bonding tool, and the step of selectively interrupting the branches is performed by engaging the same tool with the branches as part of the same processing operation.
In another arrangement, the step of selectively interrupting the branches is performed later as, for example, just prior to the stacking step. Thus, the units may be provided as substantially identical elements which may be handled and stocked as mutually interchangeable parts. Here again, the dielectric layers of the various units may include interruption openings extending through the dielectric layers, and the branches of the multi-branch traces may extend across these interruption openings prior to the severing step. The step of selectively interrupting the branches may include breaking the branches at these interruption openings. Alternatively, the interruption openings may be formed at the same time as the branches are broken as, for example, by removing small regions of each multi-branch trace and portions of the dielectric layers underlying these regions, such as by punching the circuit panels to form the interruption openings while also breaking the branches of the traces.
Because the units are substantially identical to one another and can be treated as parts interchangeable with one another up to and including the step of severing the branches, handling and stocking of the units in commerce is substantially simplified. For example, the units can be fabricated at a chip packing plant arranged to handle bare semiconductor chips and to mount the bare semiconductor chips to the circuit panels of the individual units. The stacking operation can be performed in a circuit board stuffing plant having tools and equipment adapted for surface-mounting packaged chips to circuit boards. Indeed, the stacking operation can be performed concomitantly with mounting the assembly to a circuit board. For example, the units can be stacked and the solder balls joining the various units can be reflowed at the same time as the solder balls joining the bottom unit in the stack to the circuit board are reflowed.
A further aspect of the invention provides an in-process collection of interchangeable semi-finished units usable in a stacking process and assembly as discussed above.
Another aspect of the invention provides another method of making a semiconductor chip assembly. A method according to this aspect of the invention includes the step of providing a plurality of units. Here again, each unit desirably includes at least one semiconductor chip having at least one chip select contact and a plurality of other contacts and also includes a circuit panel having chip select terminals, other terminals and traces extending on or in the panel connected to the terminals. As discussed above, at least one trace of each panel desirably is a multi-branch trace including a common section and plural branches. Each of the plural branches is arranged on the circuit panel such that a gap is between each of the branches and a corresponding one of the select terminals. The method according to this aspect of the invention desirably includes the step of selectively connecting one, or more, of the branches of the multi-branch traces so that the common section of a multi-branch trace in each unit is connected to less than all of the chip select terminals of that unit. The method preferably includes the step of stacking the units and interconnecting terminals of different units to one another to form vertical buses.
The selectively connecting step desirably is performed so that the chip select terminals of chips in different units are connected to different ones of the vertical buses. Most preferably, prior to the step of selectively connecting the multi-branch traces, the units are substantially identical to one another. The step of selectively connecting the multi-branch traces may be performed during formation of the units zzz.
A further aspect of the invention provides additional semiconductor chip assemblies. A chip assembly according to this aspect of the invention also includes a plurality of units, each including a semiconductor chip having contacts on a front surface, and including a circuit panel having a central region and a peripheral region. The panel desirably includes a dielectric layer having first and second surfaces and at least one bond window extending between the first and second surfaces in the central region. The panel also includes a plurality of terminals in the peripheral region, the terminals being exposed at both the first and second surfaces. Preferably, the dielectric layer has a plurality of terminal apertures extending between the first and second surfaces in the peripheral region and the terminals are pads aligned with the terminal apertures. The chip is disposed with the front surface of the chip facing toward a surface of the panel in the central region and the contacts of the chip are connected to the traces on the panel in the at least one bond window. The units are superposed on one another in a stack so that the rear surface of a chip in one unit faces toward a surface of the dielectric layer in a next adjacent unit. The units most preferably bear on one another in at least those portions of the central regions occupied by the traces. A plurality of conductive masses are disposed between the terminals of the units and connect the terminals of the adjacent units to one another.
In one arrangement, the traces of each unit extend along the first surface of the dielectric layer in that unit, and the front surface of the chip in each unit faces toward the second surface of the dielectric layer in that unit. In a chip assembly of this type, at least some of the units desirably include heat transfer layers overlying the traces of such units, and these units bear on one another through the heat transfer layers. Thus, the heat transfer layer of each such unit desirably abuts the rear surface of the chip in the next adjacent unit. The heat transfer layers of these units desirably extend across the bond windows in the dielectric layers of these units and are substantially flat, at least in the region extending across the bond windows. Such units desirably further include an encapsulant at least partially filling the bond windows. During manufacture, the heat transfer layers may serve as masking layers which confine the encapsulant so that the encapsulant does not protrude beyond the dielectric layer. As further discussed below, the flat heat transfer layers allow close engagement of the units with one another and good thermal contact between adjoining units. These features contribute to the low height of the assembly and promote effective heat dissipation from chips within the assembly.
In an assembly according to a further aspect of the invention, the heat transfer layer may be present or may be omitted, but the encapsulant defines a surface substantially flush with the first surface of the dielectric layer or recessed relative to such surface. Where the heat transfer layer is omitted, the dielectric layer of each unit may bear directly on the rear surface of the chip in the next adjoining unit.
A chip assembly according to another aspect of the invention also includes a plurality of units. Each unit includes a circuit panel and may include one or more chips. Each circuit panel has a number of terminals and traces extending on or in the panel. The traces are electrically connected between the contacts of the one or more chips and the terminals. The units are superposed on one another in a stack. A plurality of conductive masses are disposed between the terminals of the units and connect the terminals of the adjacent units to one another forming vertical buses. The top-most unit includes one or more termination elements, and desirably an array of plural termination elements, such that one, or more, signals, received from one, or more, of the vertical buses are electrically terminated. The termination elements desirably provide electrical characteristics at the upper ends of the vertical buses which mitigate signal reflection along the buses.
A chip assembly according to another aspect of the invention also includes a plurality of units. Each unit includes a circuit panel and may include one or more chips. Each circuit panel has a number of terminals and traces extending on or in the panel. The traces are electrically connected between the contacts of the one or more chips and the terminals. The units are superposed on one another in a stack. A plurality of conductive masses are disposed between some of the terminals of the units and connect those terminals of the adjacent units to one another forming vertical buses. Additionally, one, or more, passive elements as, for example, resistors, capacitors and inductors are disposed between other terminals of the units such that those terminals of the adjacent units are electrically connected through the passive element or elements.
A chip assembly according to yet another aspect of the invention also includes a plurality of units. Each unit includes a circuit panel and may include one or more chips. Each circuit panel has a number of terminals and traces extending on or in the panel. The traces are electrically connected between the contacts of the one or more chips and the terminals. The units are superposed on one another in a stack. A plurality of conductive masses are disposed between the terminals of the units and connect the terminals of the adjacent units to one another forming vertical buses. A plurality of the vertical buses around at least a portion of the periphery of the chip assembly are connected to ground or to another source of constant potential. These busses cooperatively define a Faraday cage around at least a part of the periphery of the stacked assembly. Preferably, the top-most unit includes a conductive plane such as a ground plane. These vertical buses constituting elements of the Faraday cage desirably are connected to the conductive plane so that the conductive plane forms a part of the Faraday cage. A stacked assembly in accordance with this aspect of the invention provides economical electromagnetic shielding.
These and other objects, features and advantages of the present invention will be more readily apparent from the detailed description of the preferred embodiments set forth below, taken in conjunction with the accompanying drawings.
A package in accordance with one embodiment of the invention uses a plurality of package elements 20, each such element being in the form of a circuit panel. Each such circuit panel may include a dielectric layer in the form of a thin, flexible dielectric tape as, for example, a layer of reinforced or unreinforced polyimide, BT resin or the like on the order of 25-100 μm thick, most preferably 25-75 μm thick. Alternatively, each panel may include a dielectric such as a fiberglass-reinforced epoxy as, for example, an FR-4 or FR-5 board. The panel has numerous terminals 22 disposed in rows within a peripheral region of the panel, adjacent the edges 24 of the panel. In the embodiment illustrated, rows of terminals are provided along all four edges. However, the terminals can be provided adjacent less than all of the edges as, for example, in two rows adjacent to two opposite edges of the panel. Each terminal 22 may be in the form of a flat, relatively thin disc of copper or other suitable metallic material on a first surface 26 of the panel (the surface visible in
Each panel 20 further has an elongated bond window 32 extending adjacent the center of the panel. The panel further has a large number of leads 36. Each lead includes a trace 38 extending along the first surface 32 of the panel and a connection section 40 formed integrally with the trace projecting from the trace across the bond window. In the unassembled state depicted in
The terminals 22 include a first set of select terminals 22A-22D; a second set of select terminals 22E-22H; as well as other terminals, referred to herein as non-select terminals, as, for example, terminals 22J and 22K. Each trace 38 includes a common section 46 adjacent to and connected to a connection section 40. Some of the traces are connected to the non-select terminals. These traces have common sections 46 which extend all the way to the associated terminals, such as to terminals 22J and 22K, so that the common section 46 of each such trace is connected directly with a non-select terminal.
Those traces 38 associated with the select terminals are multi-branched traces 50. Each such multi-branched trace has a plurality of branches connected to its common section 46 and connected to one of the associated select terminals. For example, trace 38A includes branch 50A connected to select terminal 22A; branch 50B connected to select terminal 22B; branch 50C connected to select terminal 22C; and branch 50D connected to select terminal 22D. Trace 38A also includes a distribution section 52A extending transverse to the common section 46A and interconnecting the various branches 50A-50D with the common section. Trace 38E associated with terminals 22E-22H is also a multi-branched trace and has a similar set of branches 50E-50H and distribution section 52E, so that all of the branches 50E-50H are connected to the common section 46E of the trace and to its connection section 40E. The dielectric of panel 20 has disconnection apertures 54 aligned with the branches 50 of each multi-branched trace 38, so that each such branch extends across a disconnection aperture. The disconnection apertures are disposed adjacent to the select terminals 22A, 22B, etc.
The terminals and the leads, including the traces and connection sections, are formed as a single layer of metallic features on the first surface of the panel. These metallic features desirably are less than about 30 μm thick, typically about 5-25 μm thick as, for example, about 20 μm thick. A thin adhesive layer (not shown) optionally may be provided between the dielectric layer 20 and the metal layer. This adhesive layer should also be as thin as practicable, desirably about 15 μm or less thick. The terminals and traces can be formed by conventional processes used in manufacture of tape automated bonding tapes and the like as, for example, by etching a laminate including a layer of copper or other metal and the dielectric material which forms the panel so as to remove portions of the metallic layer. Alternatively, the terminals and traces can be formed by a deposition process such as electroless plating and/or electroplating. The bond window, the holes associated with the terminals and the disconnection apertures may be formed by etching or ablating the dielectric material.
The stacked chip assembly includes a plurality of units 56 (
A layer of adhesive 68 is disposed between the chip and the panel of each unit. The adhesive layer 68 defines an aperture in alignment with the bond window. Adhesive layer 68 may be provided by applying a liquid or gel material between the chip and the panel at the time of assembly or by providing a porous layer such as an array of small resilient elements between the layers and injecting a flowable material into such layer as taught, for example, in certain embodiments of U.S. Pat. Nos. 5,659,952 and 5,834,339, the disclosures of which are hereby incorporated by reference herein. Preferably, however, the adhesive layer is provided as one or more solid or semi-solid pads having substantially the same horizontal extent as the desired adhesive layer in the final product. These pads are placed between the chip and panel during assembly. For example, the pad may be pre-assembled to the panel or to the chip before the chip is juxtaposed with the panel. Such a solid or semi-solid pad can be placed quite accurately in relation to the chip and the panel. This helps to assure that the pad does not cover terminals 22, even where there is only a small clearance between the nominal position of the pad edge and the terminals. Such a pad may include an uncured or partially cured layer and other adhesion-promoting features as discussed, for example, in U.S. Pat. No. 6,030,856, the disclosure of which is hereby incorporated by reference herein. Alternatively or additionally, the pad may be provided with a thin layer of a flowable adhesive on one or both surfaces, and this layer may be a non-uniform layer as described in U.S. Pat. No. 5,548,091, the disclosure of which is hereby incorporated by reference herein, to help prevent gas entrapment in the layer during assembly. Adhesive layer 68 desirably is as thin as practicable as, for example, about 10-125 μm thick, most preferably about 25-75 μm.
The chip 58 of each unit is aligned with the central region of the associated panel, so that the rows of contacts 64 are aligned with the bond window 32 in the panel. The connection section 40 of each lead is connected to a contact 64 of the chip. During this process, the connection section of each lead is detached from the anchor section 44 of the lead by breaking the frangible section 42 of the lead. This process may be performed as described in the aforementioned U.S. Pat. No. 5,489,749 by advancing a tool (not shown) such as a thermal, thermosonic or ultrasonic bonding tool into the bond window of the panel in alignment with each connection section so that the tool captures the connection section and forces it into engagement with the appropriate contact. The common section 46 of the trace 38 in each lead (
Each unit 56 further includes a solder mask layer 70 (
The heat transfer layer, whether formed integrally with the solder mask layer or separately from the solder mask layer, desirably is as thin as practicable as, for example, about 40 μm thick or less, and desirably about 30 μm thick or less. An integral solder mask layer and heat transfer layer may be provided as a conformal coating having a thickness of about 5-20 μm in those regions of the coating overlying the traces and about 10-40 μm thick in those regions disposed between the traces. Such a coating adds only about 5-20 μm to the overall thickness of the unit. As seen in
An encapsulant 33 may be provided in aperture 32, surrounding the connection sections 40 of the leads. The encapsulant may be separate from the adhesive layer 68 and may be introduced using the techniques disclosed in U.S. Pat. Nos. 6,232,152 and 5,834,339, the disclosures of which are incorporated by reference herein. As disclosed in certain preferred embodiments taught in the '152 and '339 patents, the layer attaching the chip to the dielectric layer (adhesive layer 68) may define a channel extending to one or both edges of the chip, and the encapsulant may be introduced into this channel at the edges of the chip. Alternatively, where the adhesive layer is formed in whole or in part by a flowable material introduced between the chip and the dielectric layer as discussed above, the encapsulant may be formed by the flowable material. In either process, the heat transfer layer 76 (or internal heat transfer and solder mask layer) covers the bond window in the dielectric layer so that the encapsulant cannot project beyond the first surface 76 of the dielectric layer.
During assembly of each unit, some of the branches of each multi-branched trace are broken so as to disconnect the terminals associated with those particular branches from the common section of the multi-branched trace. Preferably, all but one branch of each multi-branched trace is broken, leaving only one select terminal connected to the common section of each multi-branched trace. The branches may be broken by advancing a tool into the disconnection apertures 54 associated with the branches to be broken. The tool may be the same tool used to perform the bonding operation on the connection sections of the leads. To facilitate the breaking operation, the branches may be provided with frangible sections weaker than the remainder of the branch, such as narrowed sections (not shown), in alignment with the disconnection apertures. During the breaking process, the terminals 22 adjacent to the branches to be broken serve as anchors for the branches so that the branches tend to break rather than becoming detached from the dielectric of panel 20. The broken ends of the branches are not connected to any portion of the chip. The adhesive layer 68 preferably does not include apertures aligned with the disconnection apertures and the broken ends of the branches become buried in the adhesive. Alternatively, the broken ends of the branches may contact the dielectric passivation layer (not shown) on the surface of the chip.
Different units have different ones of the branches connected to terminals after the breaking step. For example, in the four-unit assembly depicted in
The units are stacked one on top of the other as illustrated in
Prior to assembly of the stack, the individual units can be tested in a test socket having contacts corresponding to the locations of the terminals. Typically, the solder balls are bonded to the terminals of each unit so that they project from the first surface 26 of the panel and the unit is tested with the solder balls in place. For example, the test socket may have openings adapted to engage the solder balls. Because all of the units have terminals and solder balls in the same pattern, the single test socket can be used to test all of the units.
The resulting package may be assembled to a circuit board using conventional surface mounting techniques. The solder balls 78 of the lower most unit 56D can be reflowed and bonded to contact pads 80 of a circuit board 82, partially depicted in
The completed package provides numerous advantages. As discussed above, the select contacts of chips in different units are connected to different select terminals and therefore connected to different vertical buses. By routing selection signals to the contact pads of the circuit board associated with these buses, it is possible to apply a selection signal to a select contact in a chip of only one unit. The vertical buses formed by the interconnected solder pads are quite short and provide low electrical impedance. Also, the traces provide a relatively lower impedance path. Typical traces have an inductance of about 5 nanohenries or less. Moreover, signal propagation delays between the contact pads of the circuit board and the contacts of any given chip are nearly the same as the signal propagation delays between the contact pads of the circuit board and the contacts of any other chip in the package. The units can be made economically, using “single-metal” circuit panels having conductive features on only one side. The entire package has a height which is determined in part by the thicknesses of the individual chips. Merely by way of example, one package which incorporates four units, each having a chip about 125 microns thick, has an overall height of about 1.5 mm.
The low overall height of a package is due in part to the small thickness of the elements other than the chips which determine the spacing between adjacent chips in the stack. As discussed above, within the central region of each unit aligned with the chip of such unit, the unit desirably includes only the adhesive layer 68, the leads or traces 38 and the heat transfer or solder mask layer and, optionally, a further adhesive layer between the dielectric layer and the metallization forming the leads. The distance d between corresponding features of adjacent units as, for example, the distance d between the second surface 30 of the dielectric layer 20 in unit 56A and the corresponding surface of the dielectric layer in unit 56B will be equal to the thickness t of chip 58B disposed between these layers plus the aggregate thickness of the aforementioned layers constituting the central portion of each unit. Most preferably, the distance d between adjacent units is equal to the thickness t of the chip plus about 250 μm or less, most preferably about 200 μm or less. Still smaller distance d can be achieved when the various layers are selected to provide the minimum height.
Because the heat transfer layer or combined solder mask layer and heat transfer layer is substantially flat, it can make good, intimate contact with the rear surface of the chip. This helps to provide both a low overall height and good heat transfer between units. Heat evolved in the chips of units in the middle of the stack can be dissipated by heat transfer to adjacent units through the top or bottom of the stack and from the top or bottom of the stack to the environment as, for example, to the circuit board 82 or to the surrounding atmosphere. To assure good heat transfer, and to provide the minimum overall height, it is desirable to assure that the central region of each unit is brought into abutting contact with the chip in the next adjacent unit during the stacking and reflow operations. It is also desirable to assure that the units align with one another in the horizontal direction during the stacking and reflow process, using the self-centering action provided by the surface tension effects of the solder balls. If the height of the solder balls is selected to provide a nominal clearance of about 10-15 μm prior to reflowing, then upon reflowing the solder balls will initially align the units with one another and, additionally, the solder will collapse to bring the units into abutment with one another. Alternatively or additionally, the units may be pressed together during reflow to assure abutment, and may be aligned with one another using appropriate fixturing or robotic systems as, for example, systems equipped with robotic vision components.
In a variant of the assembly method discussed above, the units can be fabricated without breaking the branches 50 of the multi-branched traces. These units can be handled and stocked as interchangeable parts prior to assembly with one another and with the circuit board. The branches are broken in a separate operation, desirably immediately prior to assembly. Thus, the step of selectively interrupting the branches desirably is performed in the same production plant or facility as the step of stacking the units. The separate branch-breaking operation does not require the same degree of precision required for bonding the connection sections of the leads and hence can be performed by less-precise equipment. Moreover, the ability to handle and stock only one type of unit throughout the entire supply chain up to assembly simplifies handling and distribution. Thus, units having identical chips, traces and terminals, prior to breaking the branches, are interchangeable with one another and can be provided in bulk, as a collection of interchangeable semi-finished articles. As used in this context, the term “identical” refers to the nominal configuration of the chips, traces and terminals, without regard for unit-to-unit variations which necessarily occur in any manufactured article.
The stacking and branch-breaking operations desirably are performed in a production plant adapted for attaching packaged semiconductor chips, modules and other components to the circuit board, an operation commonly referred to in the industry as “board stuffing.” Board stuffing plants which employ surface mounting technology are commonly equipped with facilities for handling and placing components onto the circuit board, and with reflow equipment for momentarily heating the circuit board with the components thereon to fuse solder or otherwise activate bonding materials between the components and the contacts of the circuit board. The stacking operation can be performed using substantially the same techniques and procedures used for mounting elements to circuit panels. Only the minimal additional operation of breaking the branches is required.
In yet another variant, the stacking operation can be performed concomitantly with assembly of the stack to the board. That is, the individual units can be stacked on the circuit board, one above the other and temporarily held in place on the board as, for example, by a temporary clamping fixture, gravity, by adhesion between units, by flux at the terminals, or by some combination of these. In this assembled condition, the solder balls or conductive elements 78 associated with the bottom unit 56 d overly the contact pads of the circuit board and the solder balls of the other units overlies the terminals of the next lower unit in the stack. After stacking, the entire stack and circuit panel are subjected to a reflow operation sufficient to fuse the bottom solder balls to the contact pads of the circuit board and to fuse the solder balls of the other units to the terminals of the adjacent units. This reflow operation may be performed in conjunction with the reflow operation used to attach other components to the board.
A package according to a further embodiment of the invention depicted in
A thermal spreader 190 is mounted to the top unit 156A, in contact with the heat transfer layer 176A of the top unit. The thermal spreader 190 may be formed from a metal or other thermally conductive material and may incorporate features such as ribs or fins (not shown) for dissipating heat into the surroundings. Also, the thermal spreader may have walls extending downwardly adjacent the edges of the package toward the circuit board 182 to promote the heat transfer between the spreader and the circuit board. The heat transfer layer 176 provided on the first or chip-remote surface 126 of the top most unit 156A conforms closely to the surface of the panel 120 in such unit and to the traces 156. As discussed above, this layer may be a dielectric layer to maintain electrical insulation between the traces of the top unit and the spreader. Alternatively or additionally, the solder mask layer 174 of the top-most unit may extend over the traces, into the central region of the panel to provide electrical insulation for the traces. Similar thermal conductive layers 176 are provided over the central regions of the panels in the other units. Here again, the solder mask layer or other dielectric layer can be used to insulate the traces if the heat transfer layer is electrically conductive. As discussed above in connection with
Where solder balls 178 are provided on the same side of the tape as the chip, the solder balls may be surrounded wholly or partially by a stiffening layer (not shown) as disclosed in a co-pending, commonly assigned U.S. Patent Application Ser. No. 60/314,042, filed Aug. 22, 2001, and in the PCT international application claiming priority of same, Serial No. PCT/US02/26805, the disclosures of which are hereby incorporated by reference herein. As disclosed in the '042 application, a stiffening layer can be formed by a flowable material as, for example, an epoxy or encapsulant such as an epoxy or encapsulant injected between the chip and the panel of a unit to form the adhesive layer 168. The stiffening layer extends towards the periphery of the panel and desirably surrounds the solder balls where the stiffening layer reinforces the panels for ease of handling during assembly. Because this layer is disposed outside of the central region, beyond the area occupied by the chips, it does not add to the height of the stack.
The rear surface 162 of the chip in the bottom unit 156D faces toward the circuit board 182. Rear surface 162 may be physically attached to the circuit board and placed in more intimate thermal communication with the circuit board by a thermal layer 192 provided between the rear surface of the chip and the board. Such a thermal layer may be formed from a thermally conductive material such as a gel or grease with a conductive filler or from a solder which is reflowed when the solder balls of the bottom unit are reflowed to attach the terminals to the contact pads 180 of the circuit board.
The embodiment of
In the embodiment depicted in
The embodiment of
In a further variant, the translator itself may include one or more semiconductor chips. For example, the translator may be a “bottom unit” of the type discussed in certain preferred embodiments of the co-pending, commonly assigned U.S. Provisional Patent Application Ser. No. 60/408,644, entitled “Components, Methods and Assemblies For Stacked Packages,” filed on or about Sep. 6, 2002 and naming Kyong-Mo Bang as inventor, the disclosure of which is hereby incorporated by reference herein. As further discussed in the '644 application, such a bottom unit includes a bottom unit semiconductor chip and also includes top connections adapted to receive additional microelectronic devices. Such a bottom unit also may be mounted to a circuit board in a circuit board stuffing plant and additional microelectronic devices, such as a stacked assembly as discussed herein may be mounted to the top connections of the bottom unit. Merely by way of example, the bottom unit chip may be a microprocessor or other chip, whereas the chips in the stacked assembly mounted to the bottom unit may be memory chips which, in service, cooperate with the bottom unit chip.
The package illustrated in
In a further variant (
In a variant of this approach, the conventional wire bond is replaced by a stud bump. As shown in
The bonding tool 685 is forcibly advanced downwardly until the ball 690 engages pads 680 and 680. To facilitate such engagement, the width Wg of gap 651 or distance between trace portions desirably is less than the diameter of ball 690 as, for example, about 40 μm or less, most preferably about 30-35 μm. Ultrasonic energy is applied though tool 685, and the ball is squeezed between the tool and the pads. Under the influence of the applied energy and force, the ball 690 deforms to form a “bump” 693 depicted schematically in
A unit in accordance with a further embodiment of the invention (
Terminals 722C and 722D form a set of chip select terminals associated with a multi-branched lead 738C having a common section 746C adapted for connection to a chip select contact 764 and also having branches 750C and 750D connected to the common section. Branch 750C connects the common section to a chip select terminal 722C, whereas branch 750D connects the common section 746C to another chip select terminals 722D. As best seen in
As best seen in
Thus, the branches 750 can be selectively broken by inserting a tool into the notch as, for example, a punch 702 (
The unit partially depicted in
As seen in
In yet another variant, the circuit panel 920 has an edge 924 with projections 925 extending outwardly from such edge. A multi-branched lead 938 has branches 950 extending outwardly onto the projections. Individual branches can be interrupted by severing one or more of the projections as, for example, by severing projection 925A so as to interrupt branch 950 a. This operation can be performed using a die or blade having recesses where projections are to remain attached. In the completed, stacked assembly, the remaining projections 925 can be bent out of the plane of the circuit panel, as shown in
Numerous variations and combinations of the features discussed above can be utilized without departing from the present invention. For example, the various circuit panels may include additional features such as ground or power planes or additional layers of traces. The traces and other conductive features of each panel can be placed on the second or chip-facing side of the panel rather than on the first side remote from the chip. For example, as shown in
A further variant in accordance with an aspect of the invention is shown in
Desirably, the gaps in the branches are positioned in the peripheral region of the circuit panel, outside of the region 1158 occupied by the chip (indicated in broken lines in
In a further variant (
This form of solder bridging can be accomplished by selective application of a solder flux (not shown) to the respective portion of branch 1250 and the gap to contact 1222 b. The solder flux enhances wetting by the solder of the solder ball in the molten state, i.e., during reflow. It should be noted that this “bridging” phenomenon is normally regarded as undesirable and to be avoided in electrical circuit fabrication. Yet, and in accordance with an aspect of the invention, solder bridging of electrical connections can be used to selectively connect signals as described herein. Indeed, other selective treatments can be used to selectively connect signals together. For example, a flux or other material which promotes solder flow may be applied selectively in the gap between a branch and a terminal to provide solder flow across the gap only at a selected branch or branches and thereby form bridging conductive elements at only the selected branches. In this embodiment, the pads at the ends of the branches would not be covered by a solder mask when initially manufactured. In a further variant, the circuit panel of each unit can be made with all of the branches having gaps arranged so that the pads at the ends of the branches would be wetted by the bus solder balls on the associated terminals, and conductive bridging elements would be formed at all of the branches, if the unit is used in the as-manufactured condition. Before applying the solder balls, the units are selectively treated, as by selectively applying a solder mask or other material over the pads on some of the branches of each multi-branch trace, so that the applied material inhibits formation of the bridging conductive elements at some, but not all, of the branches of each multi-branch trace. For example, spots of solder mask can be applied by screen printing or dispensing a flowable dielectric and curing the dielectric to form the solder mask where required.
The embodiment shown in
In addition, each of the terminals 1353 also provides support for a solder ball referred to herein as an “auxiliary” solder ball. However, the auxiliary solder balls for use on terminals 1353 are selectively applied to pads 1353 only where bridging conductive elements are to be formed. Thus one or more, of the select terminals 1322 is electrically coupled to the pad 1353 of the associated branch 1350 upon reflow, e.g., in forming the stacked package. In other words, the adjacent bus and main solder balls are joined together upon reflow, thus, selectively bridging one, or more, terminals 1322 to multi-branched trace 1339. As such the distance 1354 between pads 1353 and terminals 1322 is selected such that upon reflow, an auxiliary solder ball (if present) will bridge to an adjacent bus solder ball.
This is further illustrated in
As described above, a stacked assembly comprises a plurality of units, each unit desirably including at least one semiconductor chip arranged on at least one circuit panel. In this stacked assembly, vertical buses and traces on the circuit panels of the individual units convey signals to the various chips of the stacked assembly. For example, in the case of a stacked assembly comprising a vertical array of memory chips, the vertical buses convey signals such as data, address, and control as well as one or more supply voltages and ground paths. An overall signal path for a particular signal includes, e.g., the traces on the circuit board, the vertical busses of a stacked package and the corresponding traces on each of the circuit panels of the stacked package. Such a path may have an appreciable signal propagation time. Consequently, signal reflection from an end of the signal path may become a concern. Signal reflections can arise, for example, in traces ending in a stacked package and at the upper ends of the vertical buses. Signal reflection causes signal distortion and noise, which may lead to errors in operation of the circuit and/or limitations on the speed of operation of the circuit.
Therefore, and in accordance with another aspect of the invention, a stacked assembly includes one, or more, terminating elements, preferably electrically connected to the vertical buses or traces at or near the top of the stacked assembly for reducing signal reflection on one, or more, traces or buses of the stacked assembly. As used herein, the top of the stacked assembly is that region opposite the bottom of the stacked assembly, whereas the bottom of the stacked assembly is that region of the assembly which will lie closest to the circuit board or other substrate which receives the stacked assembly when the stacked assembly is mounted on such substrate. Although, the termination elements are preferably at a top of a stacked assembly, this is not required.
A signal line which simply ends at a point unconnected to any other electrical component presents essentially infinite impedance to signals passing along the line and reaching the end point. The term “termination element” as used in this disclosure refers to an element which provides a predetermined electrical characteristic other than a substantially infinite impedance. An illustrative termination element 1110 is shown in
As shown in
Terminals 1111 of termination unit 1193 are arranged in a pattern corresponding to the pattern of terminals 1192 on the operational units 1190, and terminals 1111 are connected to the various vertical buses of the stack. The ground and power buses of the stack provide ground and power potentials to the termination elements 1110 included in the IPOC 1180 of termination unit 1193. For example, as seen in
Other arrangements are possible. For example, the IPOC may be provided with contacts in a pattern matching the pattern of terminals on the operational units, so that contacts of the IPOC may be attached directly to the tops of the vertical buses. In this arrangement, the termination unit may consist solely of the IPOC, with no separate circuit panel. Moreover, it is not essential to provide termination elements connected to all of the vertical buses. For example, in some memory chips the data buses may operate at considerably higher frequencies than buses used to convey addresses or commands, and hence signal reflections in the data buses may be more significant than signal reflections in the address or command buses. In this case, the termination unit may provide termination elements associated only with the data buses. In other arrangements, the termination elements may include discrete elements mounted to the circuit panel 1186, or even integrated within the circuit panel.
Turning now to
The passive elements in
In a further embodiment (
Stacked package assemblies may include one, or more, components, which generate or process signals at high frequencies as, for example, a processing chip, a high-speed memory, a radio frequency power amplifier or receiver. These components may be a source of electromagnetic radiation that can interfere with the operations of other devices or circuits in the vicinity of the radiating components. Also, components of a stacked package assembly may be susceptible to electro-magnetic interference generated externally to the stacked package and impinging thereon.
A stacked package assembly according to a further embodiment of the invention incorporates a Faraday cage for electromagnetic shielding. An operative unit 1501 (
As shown in
The efficacy of the cage in blocking electromagnetic radiation is related to the wavelength of the radiation and to the spacing or distance between the vertical shielding buses 1540 constituting the conductors of the Faraday cage. Generally, a Faraday cage will block those electromagnetic frequencies having a wavelength approximately equal to, or greater than, the distance between adjacent conductors of the cage. A Faraday cage will fail to provide a shield above some cutoff frequency, where the distance between adjacent conductors is substantially greater than the wavelength of the emitted electromagnetic radiation. The distance, DF, between shielding terminals 1524 is selected in accordance with the desired shielding characteristics of the Faraday cage. Preferably, DF is selected to provide shielding up to and above a maximum shielding frequency which in turn is selected based on a principal electrical frequency associated with the electronic components mounted in the operative units 1501 of the stacked assembly. In the case of a digital chip having internal components adapted to operate in synchronism with a clock signal, the principal frequency can be taken as the maximum operating clock frequency of the chip. In the case of analog RF components such as an RF receiver or transmitter, the principal frequency can be taken as the maximum radio frequency used in operation of the components. Desirably, DF is selected to provide effective shielding up to a maximum shielding frequency which is two or more times the principal frequency. As a first approximation, the distance between conductors can be taken as equal to the center-to-center distance DF between adjacent shielding terminals minus the diameter DB of an individual solder ball prior to reflow and accordingly DF can be selected to provide a desired maximum shielding frequency. Using this approximation, the value (DF−DB) is selected to be less than or equal to the wavelength corresponding to the desired maximum shielding frequency.
As shown in
The Faraday cage can be used to shielding other devices or circuits from the electromagnetic radiation of a stacked assembly, or to shield the components of a stacked assembly from electromagnetic radiation impinging on the assembly from the outside. The Faraday cage can be formed economically, and adds little to the overall size of the stacked assembly. The vertical shielding buses typically are connected to ground by the circuit board, and hence connect the conductive plane of the shielding unit to ground. Some or all of the shielding terminals in the operative units can be provided with traces connecting these terminals to the electronic devices in the operative units, so that the vertical shielding buses also serve as ground connections for the electronic devices. Also, although the Faraday cage and the associated conductive plane at the top of the assembly are almost always connected to ground potential, this is not essential; the cage and conductive plane can be connected, for example, to another a power supply or other constant voltage source available on the circuit board. Further, the vertical buses forming the Faraday cage can be used without a ground plane or other conductive plane incorporated in the assembly. For example, in some applications it may not be necessary to provide shielding against electromagnetic radiation at the top of the assembly. Alternatively, other elements such as an overlying circuit board or heat shield may provide shielding at the top of the assembly. If the conductive plane is omitted, the vertical buses included in the Faraday cage desirably are electrically interconnected with one another by other elements of the stacked assembly or by elements in the circuit board to which the assembly is mounted. Similarly, it is not always essential to provide the vertical shielding buses around the entire periphery of the stack. For example, the embodiment of
In the embodiments discussed above, the conductive elements connecting the various units to one another and forming the vertical conductors are conventional solder balls. Other conductive elements may be employed instead. For example, so-called “solid core solder balls” can be used. Solid core solder balls include cores formed from a material having a relatively high melting point and a solder having a melting temperature lower than the melting temperature of the core. Still other conductive elements can be formed from masses of a conductive polymer composition. Further, although the conductors extending between units in a stacked assembly are described above as “vertical”, these conductors need not extend exactly perpendicular to the planes of the circuit panels; the vertical conductors or buses may be sloped so that they extend horizontally as well as vertically.
As these and other variations and combinations of the features set forth above can be utilized, the foregoing description of the preferred embodiment should be taken by way of illustration rather than by limitation of the invention.