CMOS power-on reset circuit
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United States of America Patent
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Aug 13, 1991
Grant Date -
N/A
app pub date -
Nov 28, 1989
filing date -
Nov 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power-on reset circuit. The reset circuit provides an automatic reset pulse immediately after power-up. The supply voltage is provided to the reset circuit. An RC filter with a variable time constant provides a 'hump' waveform which is coupled to a waveform shaper. The waveform shaper converts the hump voltage output from the RC filter into a reset signal. Latching mechanisms are included to prevent refiring of the reset signal.
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