Patent ID: 8421517

Claim:
A semiconductor device comprising: a first input terminal to which a first device driven by a first power supply voltage is connected; a second input terminal to which a second device driven by a second power supply voltage is connected; a first level shifter which is connected to the first input terminal and which performs conversion into a third power supply voltage; a second level shifter which is connected to the second input terminal and which performs conversion into the third power supply voltage; a third level shifter that converts the third power supply voltage into the first power supply voltage; a fourth level shifter that converts the third power supply voltage into the second power supply voltage; a first output terminal that outputs to the first device a signal based on a signal from the third level shifter, wherein the first output terminal is a same terminal as the first input terminal; a second output terminal that outputs to the second device a signal based on a signal from the fourth level shifter; a transistor which is connected between a connection point between the first level shifter and the first input terminal and a reference voltage, and in which a signal of the third level shifter is input to a control terminal; a resistor connected between the first input terminal and the first power supply voltage; and a control portion which is driven by the third power supply voltage and to which an output of the first level shifter and an output of the second level shifter are connected.