Patent ID: 7859322

Claim:
An internal power-supply circuit for generating an internal voltage based on a reference voltage, the internal power-supply circuit comprising: a reference-voltage generating unit for generating the reference voltage from an external power-supply voltage which is applied externally, the reference-voltage generating unit receiving a burn-in control signal which is asserted during a burn-in test and negated during a normal operation; and an internal-voltage generating unit for generating, upon receiving the reference voltage, the internal voltage based on the reference voltage, wherein during the normal operation, the reference-voltage generating unit generates a normal reference voltage that is independent of variation in the external power-supply voltage and the external power-supply voltage has a first potential, wherein during the burn-in acceleration test, the reference-voltage generating unit generates a first burn-in reference voltage that is dependent on variation in the external power-supply voltage and a second burn-in reference voltage that has the same potential as the normal reference voltage, and the external power-supply voltage has a second potential that is higher than the first potential during the burn-in acceleration test, wherein the reference-voltage generating unit includes a normal-reference-voltage generating circuit that is activated during the normal operation to generate the normal reference voltage, a first burn-in reference voltage generating circuit that is activated during the burn-in acceleration test to generate the first burn-in reference voltage, and a second burn-in reference voltage generating circuit that is activated during the burn-in acceleration test to generate the second burn-in reference voltage.