THREE_STEP_SEQUENCE_TIMER

Published:2009/7/13 2:34:00 Author:May | From:SeekIC

Provides three different outputs at predetermined time intervals for initializing conditions during startup or for activating test signals in sequence. Uses three Texas Instruments SN52555 or SN72555 timers which are interchangeable with other 555 timers. Values of R and C at output of each timer determine delays (T=1.1RC). With values shown below timers, output A is 5 V for interval of 1.1 s after switch is closed. At end of this interval, output B goes to 5 V for 0.5 s, after which output C goes to 5 V for 1.5 s to complete sequence. Supply can be 5-15 V.- The Linear and Interface Circuits Data Book for Design Engineers, Texas Instruments, Dallas, TX, 1973, p 7-53-7-61.



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