55_MHz_presettable_counter

Published:2009/7/5 23:34:00 Author:May | From:SeekIC

High-speed four-decade counter with preload switches gives positive output pulse 30 ns long at 55 MHz to ensure that all counters are preset to right digit and transients have died out at end of count. If counters are preset to 5555, input fre-quency is counted until countgets to 9997. Next clock pulse triggers auxiliary flip-flop to initiate load pulse (2 cycles long) and get back tozero Total count is 10,000 minus 5555, or 4445 (10-kHz output for 44.5-MHz input.) Article covers construction and testing. Counter draws less than 300 mA at 5 V. Developed for use in 2-meter frequency synthesizer-H. Cross, HighSpeed Divide-by-N Counters, Ham Radio, March 1976, p 36-38.



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