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In an SR latch built from two cross-coupled NOR gates, which input combination is not allowed?

2112Medium DSSSB TGT Computer Science 0 replies 1 views

AS = 1, R = 1
BS = 0, R = 1
CS = 1, R = 0
DS = 0, R = 0

Correct answer: A

Explanation

With S = R = 1 both NOR outputs are forced to 0, so Q and Q' are no longer complements and the next state is unpredictable when the inputs return to 0.

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