Semiconductor integrated circuit, liquid crystal drive device, and liquid crystal display system

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.