Patent ID: 7491986

Claim:
A semiconductor integrated circuit device, comprising: an inner logic circuit for operating with a first electric power source voltage; an input and output circuit of the inner circuit for operating with a second electric power source voltage; a first voltage line for providing the first electric power source voltage; a second voltage line for providing the second electric power source voltage; and a power source voltage supply circuit for supplying the first electric power source voltage for the inner logic circuit and the second electric power source voltage for the input and output circuit, wherein the power source voltage supply circuit comprises: a first input section for inputting the first electric power source voltage from the first voltage line, a second input section for inputting the second electric power source voltage from the second voltage line, a first output section for outputting the first electric power source voltage to the inner logic circuit, a second output section for outputting the second electric power source voltage to the input and output circuit, and a surge protection circuit for protecting the inner logic circuit and the input and output circuit from surge voltage of the first electric power source voltage and the second electric power source voltage, which is connected to the first input section and the second input section.