Does latch require setup time before rising edge?

Thread Starter

dMoser

Joined Aug 25, 2011
30
I learned that setup time for latches is the time before clock's falling edge in which data needs to remain stable.

Say that just as clock's rising edge arrives, data become stable, will Q become valid after Tpdq?

Thanks.
 

MrChips

Joined Oct 2, 2009
21,919
You need to specify the part number.
If it is a transparent latch that latches the data on the falling edge, e.g. SN7475, no setup time on the rising edge is required. Setup time for SN7475 is 20ns prior to falling edge.
 
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