[time-nuts] low power divide by 5

[Tom Van Baak]

Ed,

For division, there's less need for a dedicated divide-by-10 counter 
since the '161 and '163 are *presettable* synchronous binary counters. 
As such you can wire them to divide by anything from 2 to 16, which 
includes 10. In addition they are *cascadable*, which means that you can 
create synchronous 8- or 12- or 16- or 20-bit or even larger dividers. 
The datasheets for these counters sometimes show examples of multi-chip 
dividers.

Attached is a photo of a 'LS00 plus 3 'LS161 counters configured as 
divide-by-1173 counter. The 2nd photo is a divide-by-3295 count. You can 
see it's just a matter of changing the jumpers on the preset pins.

/tvb


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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