This reminds me of a laser control system I built about 35 years ago, when I had to build a counter that would measure the frequency of a very small signal from 0.1 to 500MHz. Getting an ECL-logic divide-by-10 counter that would clock at 500MHz was no problem, but converting the signal to a square wave was hard. Originally I was going to use a tunnel diode, but it took weeks to arrive. So I ended up building a non-saturating Schmitt trigger that worked over the full frequency range.
If you want to cover DC-200MHz, then converting the signal to a square wave (when the frequency is too low for the counter to accept a sine wave) is also something that you need to look at carefully. Using a gate with hyteresis is a good idea, however the one that you linked to has a propagation delay of up to 5.1ns @ 5V. The datasheet doesn't specify a maximum frequency, but with a propagation delay that high, there is a possibility that it may not pass 200MHz very well.
Thank you. I will have to check that out on the scope and see what it looks like. I have obtained an old Tek 2465B 400 MHz scope so I should be able to check that out at least. I actually need it to go up to 188Mhz, I am just specifying 200Mhz for headroom. If you know of a faster AND gate out there that would be more appropriate, I would love the suggestion. I am getting several of these gates, I can also test them out individually and if there are any that spec out better I can just use the best gate.