This is a simple power on switching circuit.
This type of reset pulse is ideally provided by this circuit. Because
of the high input impedance of the Schmidt trigger, long reset pulse
times may be achieved without the excess dissipation that results when
both output devices are on simultaneously, as in an ordinary gate device
(B). A reset pulse is often required at power-on in a digital system.
See circuit diagram below.
Simple Power On Reset Circuit Diagram
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