[time-nuts] low power divide by 5

[jimlux]

On 6/29/20 10:41 AM, ed breya wrote:
> 74AC logic would do it just fine, but needs 5V nominal for full-speed 
> specs. Lower supply voltage should work, but probably not all the way 
> down to 3.3V with 50 MHz clocking. The spec sheets should indicate the 
> possible range.
> 
> The 74AC390 can provide divide by 5 directly, with another divide 5 and 
> two divide 2 sections left over - lots of capability.
> 
> Ed
Couldn't find the AC390 - did find HC390, but it only goes to 35 MHz (at 
room temp, less over temp)

However, you got me started hunting for decade counters, and there's 
things like the 74HC4017 which claims fmax=60 MHz on the data sheet 
front page, but only claims 35 MHz down in the AC specs