| 摘要 |
A drain of an n-channel MOS transistor NT1 is connected to an input terminal IN for supplying an input signal to a main circuit MC, and also a source of the transistor NT1 is connected to a reference potential Vss. A source of a p-channel MOS transistor PT1 is connected to the input terminal IN, a current limiting resistor R1 is connected between the drain of the transistor PT1 and the reference potential Vss, and a source voltage Vdd=+5 [V] is supplied to the gate of the transistor PT1. An interconnection point Q1 between the drain of the transistor PT1 and the resistor R1 is connected to the gate of the transistor NT1 directly or via a gate protecting resistor R2.
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