| 摘要 |
A variable voltage tolerant input/output circuit, wherein a leakage current is not produced while having high reliability, characterized in that the circuit includes a clamping circuit for clamping the N-well potential of M1. When the supply voltage VCC is higher than or equal to the input/output voltage VI/O, the N-well potential of M1 is clamped to the supply voltage VCC; when the supply voltage VCC is lower than the input/output voltage VI/O, the N-well potential of M1 is clamped to the input/output voltage VI/O.
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