POWER_UP_POWER_DOWN_RESET

Published:2009/7/2 4:26:00 Author:May | From:SeekIC

Output of circuit goes high at end of time interval RTUCTU, required for charging of CTU by applied 5-VDC inputsignal. When 5-V power fails, Q1, drives Q2, and Q3, off, making output low for time interval determined by RTDCTD. When CTD is discharged, output goes high again. Interruption of power thus produces negative-going pulse having variable width determined by values chosen for resistors and capacitors.-S. Rummel, Reset Circuit Detects Power Drop-Out, EDN Magazine, May 20, 1976, p 94.



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