[time-nuts] 100 MHz decade divider advice needed

[ed breya]

I'd recommend good old ECL and related families for these sorts of 
things. It's a lot more RF-friendly. 116/216 type receivers and small RF 
transformers can work for I/O, the signals are reasonably-sized (<1 V 
pp), can be all differential, can operate over a wide impedance range, 
and is quiet, power supply-wise (no supply or ground glitches on 
transition). The 10H series should be nice for 100 MHz, and there are 
newer series like "EL" that can go much higher, and more functions are 
available.

The downside is powering it up - whether it's regular ECL or PECL for +5 
V, it's pretty power hungry, but can be well worth it. Since it's 
low-gain, non-saturating logic, you can have additional noise issues, 
but operating as ECL with very clean and proper -5.2 V should minimize it.

Ed