TIMER_COUNTER

Published:2009/7/14 2:34:00 Author:May | From:SeekIC

Basic circuit using XR2240 programmable timer/counter acts as programmable mono when S1 is closed, with output pulse width being a multiple in binary of RC seconds. With 8-bit binary counter, time delays range from 1 RC to 255 RC seconds. As an exi ample, if only pin 6 (dividing input frequency by 32) is connected to common output bus, duration of output pulse will be 32 RC seconds. Similarly, with pins 1, 2, 5, and 7 connected to bus, delay is 83 RC seconds. With S1 open for astable operation, output frequency is 1/t hertz where t is multiple of RC from 1 to 255. VCC is 4-15 V. - H. M. Berlin, IC Timer Review, 73 Magazine, Jan. 1978, p 40-45.



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