Question

Given a 7474 flip-flop with output Q = 0. How long can it take for Q...

Given a 7474 flip-flop with output Q = 0. How long can it take for Q to go HIGH when a PGT occurs at the CLK input? Give your answer as a number in ns (nanoseconds) without the units.

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Answer #1

If we refer the timing table for the 7474 flip flop as shown below

we see that when input is low and goes high on a clock we are intereted in time which in this case is 25 nano seconds.

Note: This table is taken from the text book "Digital Systems: Principles and Applications".

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