Semiconductor integrated circuit.

摘要

There is disclosed a semiconductor integrated circuit provided with an input circuit including an N-channel MOS transistor (N2) of which threshold voltage is set to a value lower than those of N-channel MOS transistors (N1, N3, N4) constituting other internal circuits of the integrated circuit. Thus, a circuit having a high operating margin for power supply noises is provided. This circuit further comprises a P-channel MOS transistor (P2) constituting a portion of a NOR gate or a NAND gate together with the above-mentioned N-channel MOS transistor (N2).