Patent ID: 6900688

Claim:
A switch circuit comprising: an input terminal which receives an input signal; an internal circuit which executes a predetermined function; a first MOS transistor of a first conductivity type which is coupled between the input terminal and the internal circuit, and which has a control gate receiving a control signal, a first electrode coupled to the input terminal, and a second electrode; a second MOS transistor of a second conductivity type that is opposite the first conductivity type, the second MOS transistor being coupled between the input terminal and the internal circuit, and having a control gate receiving a signal having a phase opposite the control signal, a first electrode coupled to the second electrode of the first MOS transistor, and a second electrode coupled to the internal circuit; another internal circuit which executes another predetermined function; and a switch element which is coupled between the input terminal and the another internal circuit, and which has a control gate receiving the control signal, a first electrode coupled to the input terminal, and a second electrode coupled to the another internal circuit, wherein the internal circuit is an analog circuit and the another internal circuit is a digital circuit.