Patent ID: 6480053
Filing Date: 2002-11-12
Classification: G05F,G11C,H03K

Abstract:
A semiconductor device comprising:an internal power supply output; a reference voltage generation circuit that provides reference voltages at outputs thereof corresponding to normal and test mode operations for the semiconductor device; a voltage comparison circuit; a selection circuit connected to the outputs of the reference voltage generating circuit, and operative in response to a first control signal to output one of the reference voltages to a first input of the comparison circuit; a second input to the comparison circuit connected to the internal power supply output; an internal power supply control circuit connected to the voltage comparison circuit and operative to adjust and maintain the internal power supply output at a voltage corresponding to the selected reference voltage; and a transistor connected between said internal power supply and the ground and to a gate of which a second signal indicating a test mode is inputted, wherein if said test mode indicates to lower the internal power supply voltage, said second signal goes high for a fixed period of time and turns on said transistor for a fixed period of time.