How to Find Propagation Delay
To find propagation delay, you just need a few numbers and a calculator. Propagation delay equals the distance from pin to pin divided by propagation velocity. How do you know propagation velocity? If you’re using FR4, then it is either 5.901425 if you are working in inches or 149.896 if you are working in millimeters. So again, to find propagation delay, just divide the distance for a connection by either of those numbers.
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