Patent ID: 7405732

Claim:
A semiconductor integrated circuit comprising: an input circuit for receiving a pair of differential signals input from outside of the semiconductor integrated circuit device and supplying an output signal according to a voltage difference between the differential signals; an internal logic circuit for receiving the output signal from the input circuit and performing logic operation; and an output circuit for outputting a signal having an amplitude larger than that of a signal of the internal logic circuit to the outside of the semiconductor integrated circuit device, wherein the input circuit comprises: a differential amplification stage for amplifying a differential input signal, the differential amplification stage having: a pair of differential MOS transistors having a common source; a MOS transistor for current coupled between the common source of the pair of differential MOS transistors and a power supply voltage terminal; and an output stage for generating the output signal based on a voltage output from the differential amplification stage, wherein a first power supply voltage is supplied to the internal logic circuit and a second power supply voltage higher than the first power supply voltage is supplied to the differential amplification stage of the input circuit and to the output circuit.