[54] DATA OUTPUT CIRCUIT WITH MINIMUM POWER SOURCE NOISE
[75] Inventors: Hiroyuki Hashiguchi; Ituro Iwakiri, both of Miyazaki, Japan
[73] Assignee: Oki Electric Industry Co., Ltd., Tokyo, Japan
[21] Appl. No.: 903,563
[22] Filed: Jun. 24,1992
[30] Foreign Application Priority Data
Jun. 26, 1991 [JP] Japan 3-154225
[51] Int. C1.5 H03K 3/01
[52] U.S. CI 365/206; 365/189.05;
307/473; 307/443; 307/270
[58] Field of Search 365/149, 205, 206, 203,
365/189.05, 270; 307/443, 473, 451, 270, 571,
579, 576
[56] References Cited
U.S. PATENT DOCUMENTS
4,982,380 1/1991 Koike 365/189.05
5,023,472 6/1991 Hashimoto et al 307/443
5,060,196 10/1991 Pae et al 365/189.05
5,097,149 3/1992 Lee 365/443
5,148,048 9/1992 Kawasaki et al 307/443
Primary Examiner—Eugene R. LaRoche
Assistant Examiner—Vu Le
Attorney, Agent, or Firm—Edward D. Manzo
[57] ABSTRACT
A data output circuit suitable for an integrated circuit operable at a high bit rate and having a plurality of bits of outputs. A first output transistor has a conduction path whose one electrode is connected to an output terminal, and a control electrode for controlling the conduction path in response to a first signal. A second output transistor has a conduction path whose one electrode is connected to the output terminal, and a control electrode for controlling the conduction path in response to a second signal complementary to to the first signal. A switch transistor has a conduction path having one electrode connected to the other electrode of the conduction path of the first output transistor and the other electrode connected to a first power source, and a control electrode for rendering the conduction path conductive in response to a switch signal which occurs after the first signal. A capacitor has one electrode connected to the other electrode of the first output transistor and the other electrode connected to a second power source. A plurality of such data output circuits may be mounted on a single integrated circuit, e.g., a semiconductor memory.
11 Claims, 4 Drawing Sheets
