Patent ID: 6927558

Claim:
A semiconductor device comprising: a reference voltage generating circuit which generates reference voltage based on external power supply voltage, the reference voltage generating circuit outputting the generated reference voltage from an output terminal thereof; a voltage generating circuit whose input terminal is connected to the output terminal of the reference voltage generating circuit, the voltage generating circuit lowering the external power supply voltage according to the reference voltage supplied from the reference voltage generating circuit to output internal power supply voltage from an output terminal thereof; and at least one of first and second transistors provided in the semiconductor device, the first transistor having a current path connected between a terminal to which the external power supply voltage is supplied and the output terminal of the voltage generating circuit and a gate supplied with constant voltage and having negative threshold voltage and the second transistor having a current path connected between a terminal to which the external power supply voltage is supplied and the output terminal of the reference voltage generating circuit and a gate supplied with constant voltage and having negative threshold voltage.