A level shifter has at least one of either a pull up or a pull down circuit. The circuit is made of electronic components with reliability limits less than a maximum signal level output by the level shifter. The level shifter also has a timing circuit coupled to at least on of either the pull up or pull...http://www.google.com/patents/US8106699?utm_source=gb-gplus-sharePatent US8106699 - High signal level compliant input/output circuits
