Discussion
A 'D' Flip-Flop has the following data sheet : Information setup time = 5 nsec; hold time = 10 nsec; propagation time = 15 nsec.
The output will change after the clock edge in a period of :
Answer: C
The output changes after 15 nsec.
The propagation delay is the time from the active clock edge to the change at the output, and the data sheet gives it as 15 ns.
The setup time (5 ns) is how long the D input must be stable before the clock edge, and the hold time (10 ns) is how long it must stay stable after it. Neither is the delay of the output. 20 ns adds the setup and propagation times, which has no meaning here.
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