Flip-Flops

A gated S-R latch and its associated waveforms are shown below. What, if anything, is wrong and what could be causing the problem?

A The

output is always low; the circuit is defective.

B

The Q output should be the complement of the

output; the S and R terminals are reversed.

C

The Q should be following the R input; the R input is defective.

D

There is nothing wrong with the circuit.

ANS:C -

The Q should be following the R input; the R input is defective.

Even C is replaced with R, Q should be the complement of S when the pulse is enabled because it is an asynchronous SR latch. But in the above Q output following the S input when the pulse is triggered. Why?

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