Patent ID: 7352227

Claim:
A level conversion circuit comprising: a first inverter circuit having first and second transistors of first and second conductive types, one end of a current path of the first transistor being grounded, the other end thereof being connected to one end of a current path of the second transistor of the second conducive type, and a first input signal constituted of one of a ground potential and a first voltage higher than the ground potential being supplied to gates of the first and second transistors; a third transistor of a second conductive type connected between the other end of the current path of the second transistor and a second voltage higher than the first voltage, a control signal constituted of one of the ground potential and the second voltage being supplied to a gate of the third transistor behind a change of the first input signal, wherein a first output signal constituted of one of the ground potential and the second voltage is output from an output end of the first inverter circuit; and a control circuit whose input end is connected to the gates of the first and second transistors and whose output end is connected to the gate of the third transistor, wherein the control circuit outputs the control signal in accordance with the first input signal, the control circuit comprising: a fourth inverter circuit driven by the first voltage, the first input signal being supplied to an input end of the fourth inverter circuit; a fifth inverter circuit driven by the first voltage, an output signal of the fourth inverter circuit being supplied to an input end of the fifth inverter circuit; a differential amplifier circuit driven by the second voltage to amplify and output a difference voltage between input and output signals of the fifth inverter circuit; and a sixth inverter circuit driven by the second voltage, an output signal of the differential amplifier circuit being supplied to an input end of the sixth inverter circuit, and the control signal being output from an output end thereof.