SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit capable of improving a withstand voltage to a power source surge even in an IC having a relatively small circuit scale without sacrificing the acceleration of a circuit operation or a reduction in a chip area. SOLUTION: The semiconductor integrated circuit comprises a MOSFET M4 for hysteresis connected so that a power source voltage VCC-GND is always applied between a source and a well. The integrated circuit further comprises a MOSFET M5 for surge protection connected so that a supply terminal of one power source voltage VCC and a drain of the MOSFET M4 for hysteresis is always on. Thus, the MOSFET M4 can be protected against a power source surge.