Patent ID: 7332896

Claim:
A supply voltage control apparatus comprising: a first voltage adjustment unit adjusting a first supply voltage to a first internal supply voltage used as an operating voltage of an internal circuit and supplying the first internal supply voltage to the internal circuit; a second voltage adjustment unit adjusting a second supply voltage to a second internal supply voltage used as the operating voltage of the internal circuit and supplying the second internal supply voltage to the internal circuit; a first voltage controller detecting the first supply voltage by comparing the first supply voltage with a predetermined first detection voltage and outputting a first control signal as a result of the comparison and, according to the first control signal, either applying the first supply voltage to the first voltage adjustment unit or blocking the first supply voltage from the first voltage adjustment unit; and a second voltage controller detecting the second supply voltage by comparing the second supply voltage with a predetermined second detection voltage and outputting a second control signal as a result of the comparison and, according to the second control signal, either applying the second supply voltage to the second voltage adjustment unit or blocking the second supply voltage from the second voltage adjustment unit.