| 摘要 |
PROBLEM TO BE SOLVED: To provide a tolerant input/output circuit in which power consumption can be reduced and made operating frequency can be made high. SOLUTION: The input/output circuit includes: a first logic circuit 14 which drives an output transistor P26; control circuits P25, P22, P23, and 13 which connect the output node N1 of the first logic circuit to the gate of an output transistor P26 and hold the output transistor P26 in an off-state in an input mode irrelevantly to a voltage input to an input/output terminal Tio; a switch circuit P22 disconnects the first logic circuit from a power supply in the input mode when an input signal VIH having a voltage higher than the power supply voltage VDD is input to the input/output terminal; and a back-gate control circuit 15 which supplies a back-gate voltage VB having the same voltage as the input signal VIH to a back gate in the input mode when the input signal having the voltage higher than the source voltage is input to the input/output terminal. COPYRIGHT: (C)2008,JPO&INPIT
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