Shift Registers

Q1: A modulus-12 ring counter requires a minimum of ________.

A 2 flip-flops

B 6 flip-flops

C 12 flip-flops

D 10 flip-flops

ANS:B - 12 flip-flops

The right answer is 12. Because in ring counter n ff's generate n states. In johnson n ff's generate 2n states. What you guys answering is for mod N counter it needs n ff's (N<=2^n).

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