You will need a clock shaper to convert the sine to a digital signal, and a 
series of dividers. 

You can look at my page on clock shapers for ideas:

http://www.ko4bb.com/Timing/ClockShaper.html

If you look through the archives, I believe earlier this year there was a 
thread about the respective noise performance of various logic technologies, 
but I am sure someone can recommend the current best-in-class divider for low 
noise. For any but the most demanding applications, I am sure that standard 
CMOS decade counters in the AC, HC, ACT or HCT series would work fine, such as 
the 74ACT162.

Look at this page for comparison of CMOS technologies:

http://www.solarbotics.net/bftgu/starting_elect_ic.html

Didier KO4BB

---- jshank <[EMAIL PROTECTED]> wrote: 
> Hi,
> I would like to convert a 1 MHz sine wave to a 1 pps TTL.  
> 
> Any suggestions?
> 
> Thanks,
> 
> Jeff
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