Questions about Differential Line Receivers

I have a detector with pairs of output lines: Q and Q NOT. I am told that I need to look for a 5V difference between Q and Q NOT in order to record an event; just watching for Q going high is not good enough, Q NOT has to go low at the same time. This is in order to separate signal from noise. These pulses should last for 2us give or take a us.

I am told that a Differential Line Receiver should be able to do this; however, the data sheet for one such:

...leads me to believe that the output goes high whenever A goes higher than B, not when A is some threshold higher than B. Can one of these be jiggered to use a fixed voltage threshold, i.e., the output goes high only when A is 4 volts higher than B?

The other approach would involve op-amps used as a differential amplifier and a schmidt trigger. Can anyone recommend an op amp that would respond quickly enough? Single supply would be nice, though not absolutely necessary.

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