- Setup time is the minimum amount of time the data signal should be held steady before the clock event so that the data are reliably sampled by the clock. This applies to synchronous circuits such as the flip-flop.
- In short I can say that the amount of time the Synchronous input (D) must be stable before the active edge of the Clock.
- The Time when input data is available and stable before the clock pulse is applied is called Setup time.
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