MULTIPLIER_DIVIDER

Published:2009/7/5 19:13:00 Author:May | From:SeekIC

Choice of values for R and C determines multiplication or division factor acting on square-wave input frequency. 0utput of 4013 flip-flop sets gates of 4011 to steer input clock pulse of RCA CD4047AE mono MVBR to proper inputs. When rising edge of input triggers mono, Q output of mono goes high and switches flip-flop, preparing mono to accept falling-edge trigger. Since 4047 locks out inputs until ittimes out, mono triggers only on first falling edge occurring after its output goes low. Mono pulse length is about 2.5RC. With 60-Hz input clock, mono pulse length less than 8.33 ms allows triggering on every transition, to give 120-Hz output.-P. A. Lawless, One-Shot Forms Frequency Multiplier, EDN Magazine, Aug. 5, 1978, p 72.



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