Patent ID: 6556058
Filing Date: 2003-04-29
Classification: H03K

Abstract:
A power on reset circuit incorporated in a semiconductor device and generating a reset signal for resetting said semiconductor device when power is turned on, comprising:an inverter driving said reset signal to an activated level in response to reception of a power supply potential and a reference potential, and driving said reset signal to an inactivated level in response to a potential of an input node of the inverter exceeding a predetermined threshold potential; a first resistance element having one electrode receiving said power supply potential and another electrode connected to the input node of said inverter; a first transistor of a first conductivity type having a first electrode receiving said reference potential and a second electrode connected to the input node of said inverter, and rendered conductive in response to said reset signal attaining the activated level; and a second transistor of the first conductivity type having a first electrode receiving said power supply potential and a second electrode connected to the input node of said inverter; a second resistance element having one electrode receiving said power supply potential and another electrode connected to an input electrode of said second transistor; and a capacitor having one electrode receiving said reference potential and another electrode connected to the input electrode of said second transistor.