Semiconductor integrated circuit device

Abstract

In a semiconductor integrated circuit device having a first circuit block operating on a power supply voltage supplied through an external terminal and a second circuit block operating on an internal voltage generated by a power supply circuit, a voltage having an absolute value greater than that of the internal voltage is generated by a charge pump circuit; variable impedance means is provided between the output voltage and the internal voltage; and a reference voltage and the internal voltage are compared by a differential amplifier circuit operating on the output voltage generated by the charge pump circuit and the variable impedance means is controlled such that those voltages agree with each other.

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