Patent ID: 6940332

Claim:
A level shift circuit, comprising: a first conduction type first transistor wherein a first power source voltage is supplied to a source, a first input signal is applied to a gate, and a first terminal is connected to a drain; a first conduction type second transistor wherein a second input signal in reverse relation to the first input signal is applied to a gate, and a drain is connected to a second terminal; a second conduction type third transistor wherein a second power source voltage is supplied to a source, and the first terminal is connected to a drain; a second conduction type fourth transistor wherein the second terminal is connected to a drain; a first gate voltage control circuit connected to the second terminal, input the second input signal, and making said third transistor turn ON when said first transistor is OFF, a maximum driving voltage for the first gate voltage control circuit being lower than the second power source voltage by a voltage drop of the fourth transistor; and a second gate voltage control circuit connected to the first terminal, input the first input signal, and making said fourth transistor turn ON when said second transistor is OFF, a maximum driving voltage for the second gate voltage control circuit being lower than the second power source by a voltage drop of the third transistor.