Patent ID: 8912688

Claim:
A power supply switch circuit that applies a power supply voltage from a first power supply line to a second power supply line, the power supply switch circuit comprising: a first switch element that is connected between the first power supply line and the second power supply line and switches connection and disconnection between the first power supply line and the second power supply line according to a first enable signal; a second switch element that is connected between the first power supply line and the second power supply line and switches connection and disconnection between the first power supply line and the second power supply line; and a switch control circuit that includes at least one logic gate supplied with power from the second power supply line and controls the second switch element, wherein the switch control circuit controls the second switch element based on a second enable signal supplied to the switch control circuit and on a second power supply voltage, the second power supply voltage being a voltage of the second power supply line, wherein the switch control circuit comprises: a first inverter that is supplied with power from each of the second power supply line and a third power supply line and receives the second enable signal; and a second inverter that is supplied with power from each of the first power supply line and the third power supply line and with an output signal from the first inverter, and outputs a control signal to a gate of the second switch element.