Complementary circuit device returnable to normal operation from

Abstract

A complementary circuit device which cancels a latch-up phenomenon to return to normal operation includes a complementary circuit, a latch-up detection circuit and a reset circuit. The complementary circuit, which is normally started from a prescribed logic state in response to an initial power application of power to the circuit, is susceptible to erroneous restart when the same is resupplied with power immediately after occurrence of a latch-up phenomenon. The latch-up detection circuit detects a latch-up phenomenon occurring in the complementary circuit. The reset circuit resets the complementary circuit to the prescribed logic state in response to an output from the latch-up detection circuit. The complementary circuit is reset again to the prescribed state in a manner similar to the case of initial application of power. The invention facilitates a normal return to operation of a complementary circuit upon cancellation of the latch-up phenomenon.