To divide by 5 with a '161/'163 counter, connect
the 8's bit output to the /preset enable input.
Then set the input bits to 12. The counter will
count: 12, 13, 14, 15, 0, 12, 13, 14, 15, 0 ...
This is the fastest configuration. It avoids
external gate delay and the slower carry output.
You can only divide by up to 9 this way.
I have been doing this for at least 40 years with
various logic families du jour.
Rick N6RK
On 6/29/2020 3:32 PM, ed breya wrote:
Looks like the AC161 and AC163 are readily available, so they may be
rigged for divide 5. It seems that of the counters surviving into AC,
only binary ones are included, and the oddballs like decade are
considered unnecessary - apparently nobody divides by 10 anymore, except
inside of a processor.
Ed
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