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Flip-Flops - Technical MCQs

Q1:

Edge-triggered flip-flops must have:

A very fast response times

B at least two inputs to handle rising and falling edges

C positive edge-detection circuits

D negative edge-detection circuits

ANS:C - positive edge-detection circuits

I think a triangle in the ff means positive edge trigger so for negative edge there is a triangle + a bubble It means that for edge trigger there must be a triangle which means there is, +ve edge trigger is necessary.