Hi George,
The AUC family of products can detect input changes at greater than 200 MHz for a 1.2-V supply, please see this FAQ for details on why I got the below table from a related flip-flop, and the below image from the SN74AUC74 datasheet for the clock speeds that the AUC family generally supports:
It's very important that you understand what "open-drain" means for your system though - it is very unlikely that you will be able to operate at 200 MHz with an open-drain part.
The output of an open-drain device can only pull the output low. In the 'high' state, the device's output is just in the high-impedance state (it has no positive driver, like what a push-pull output would provide).
In this case, you are counting on a pull-up resistor to charge the output load. Assuming a light load of 15 pF, and the smallest reasonable pull-up resistor to use (267 Ω), we can estimate the minimum rise time for the low to high transition:
t_r ~= 2.2 * R * C = 8.8 ns
Given that the desired bit width is 2.5 ns (for 200 MHz operation), this would obviously not work.
