| 摘要 |
A dummy circuit (303) is basically configured in the same manner as level shift circuits (203a, 203b), but an HVNMOS (311) of the dummy circuit is always set at a non-conducting state. A mask circuit (403) removes noise in signals (S200a, S200b) outputted from the level shift circuits (203a, 203b), respectively, using a signal (S300) outputted from the dummy circuit (303). Control signals (S100a, S100b) include iterative pulses that are transmitted to S and R inputs of an RS flip-flop (502). PMOSs (215, 225) bring current paths (210, 220) into a non-conducting state in response to an output signal (S500) from the RS flip-flop (502) to thereby suspend one of the level shift circuits (203a, 203b).
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