US Patent 7456656 Semiconductor device and method of manufacturing the same

A semiconductor device according to an embodiment of the invention includes: at least a first power supply system and a second power supply system; an input/output circuit capable of controlling an current for an input or output signal; a control signal input circuit that is provided to the first power supply system and receives a control signal for controlling a current of the input/output circuit; and a control circuit that is provided to the second power supply system and controls a current of the input/output circuit in accordance with a power supply voltage of the second power supply system.