Patent ID: 6642757
Filing Date: 2003-11-04
Classification: G11C,H03K

Abstract:
A semiconductor device comprising:an oscillator which starts generating a clock pulse when a power supply voltage supplied from an outside of the semiconductor device becomes higher than a first voltage; a charge pump circuit configured to execute charge pumping operation upon receiving said clock pulse; a voltage monitor configured to generate a power-on reset signal upon receiving an output voltage from said charge pump circuit; an internal power supply terminal configured to supply said power supply voltage as an internal power supply voltage, and a reference voltage generator configured to generate a reference voltage using said output voltage from said charge pump circuit as a power supply, said voltage monitor using said output voltage from said charge pump circuit as a power supply, having a comparator configured to compare a divided voltage of said internal power supply voltage with said reference voltage, and when said internal power supply voltage is higher than a second voltage, outputting a first signal of a first logic level as said power-on reset signal.