[time-nuts] low power divide by 5

[Richard (Rick) Karlquist]

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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