High voltage tolerant input buffer operable in under-drive conditions
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United States of America Patent
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Sep 18, 2007
Grant Date -
Mar 29, 2007
app pub date -
Sep 26, 2005
filing date -
Sep 26, 2005
priority date (Note) -
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Abstract
An input buffer includes a signal passing module for generating a first output signal in response to the input signal based on a comparison between the input signal and a first supply voltage thereof; a regulating module having a first input terminal receiving the input signal and a second input terminal receiving the first output signal for generating a second output signal within a first predetermined voltage range; and a level down module for generating a third output signal within a second predetermined voltage range for the core circuitry in response to the second output signal. The input signal passes through the signal passing module with a substantial voltage drop when a voltage level of the input signal is substantially greater than the first supply voltage, and without a substantial voltage drop when the voltage level of the same is less than or equal to the first supply voltage.
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