[time-nuts] Generating a solid PPS from 10Mhz source

Nick Sayer nsayer at kfu.com
Fri Jan 15 17:38:14 UTC 2016

> On Jan 14, 2016, at 3:44 PM, Morris Odell <vilgotch at bigpond.net.au> wrote:
> Am I missing something here?
> I understand the ease and fun of programming up an AVR as much as anyone but surely this task could be accomplished  easily with a chain of fast synchronous TTL or CMOS dividers. A resynchronising FF could also be added at the end to  clean up the 1 pps if required. You wouldn't need to worry about the maths or OBOBs either.
> Admittedly you would need more PCB real estate but that shouldn't be a big deal in most cases.

It’s quite a bit more real estate. An ATTiny45 is available as a TSSOP-8 and would need a 10k resistor (!RESET pullup) and a bypass cap (assuming the input was conditioned, which it would need to be for a discrete solution anyway).

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