Patent ID: 6140834
Filing Date: 2000-10-31
Classification: H03K

Abstract:
A semiconductor integrated circuit device formed on one semiconductor substrate comprising:an input circuit coupled to an input terminal which receives an input signal;an output circuit coupled to an output terminal which outputs an output signal, said output circuit being assigned to said input circuit;an internal circuit coupled to said input circuit and said output circuit; anda power supply line which supplies said input circuit and said output circuit with a power supply voltage in common,wherein said input circuit includes:a first MOSFET of a first conductivity type which has a gate receiving the input signal;a second MOSFET of the first conductivity type which has a gate receiving a reference voltage;load elements provided to the drains of said first and said second MOSFETs, respectively;a current element provided to the sources of said first and said second MOSFETs, respectively;an electrostatic protection circuit coupled to the input terminal which receives said input signal, anda first circuit coupled to the gate of said second MOSFET and adapted to transmit substantially the same noise as a noise on the power supply line transmitted to the gate of said first MOSFET through said electrostatic protection circuit to the gate of said second MOSFET.