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Old 08-10-2013, 09:52 AM
Ernst Ernst is offline
Silver Member
Join Date: Jul 2012
Posts: 868
Why not use even more modern stuff such as in attached diagram.
The response time of a 74HC86 is 9 ns. Its output will be pulled low if the inputs are equal, otherwise it will 'float' (open collector). So for as long as the inputs differ pulses can go to the counter. Counting these pulses will give you an indication of the time that the inputs were different.

Just a thought...

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