MICROSECONDS_TO_HOURS_1

Published:2009/7/12 23:21:00 Author:May | From:SeekIC

Simple CMOS circuit serves as time-delay switch and generalpurpose timer. Gated oscillator and latch are obtained from CD4001 quad two-input NOR gate, and 14-stage counter uses CD4020. TON is function of oscillator frequency as determined by RXCX and proper 2N output from counter. Pulse applied to latch input enables oscillator and counter. Latch output remains high until counter resets latch at end of count selected by switch. Further decoding is required for count or time variations finer than power of 2.-J.Chin, Low-Power Counter is Programmable over Wide Range, EDN Magazine, March 20, 1974, p 83.



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