Patent ID: 7759976

Claim:
A level shift circuit comprising: a first logic unit, based on an input signal and a first operation control signal indicating a supply state of a first voltage, generating a first control signal in accordance with the input signal when the level shift circuit is supplied with the first voltage and a second voltage, and including a first transistor which clamps the first control signal at a predetermined first level based on the first operation control signal when the level shift circuit is supplied with the second voltage; a second logic unit, based on the first control signal and a second operation control signal indicating the supply state of the first voltage, generating a second control signal in accordance with the first control signal when the level shift circuit is supplied with the first and second voltages, and including a second transistor which clamps the second control signal at a predetermined second level based on the second operation control signal when the level shift circuit is supplied with the second voltage; and a level converter, generating an output signal in response to the first and second control signals.