Which of the following input combinations is not allowed in an SR flip-flop?

S=0, R=0

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S=0, R=1

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S=1, R=0

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S=1, R=1

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Solution

The correct option is B S=1, R=1
S=1, R=1 input combinations is not allowed in an SR flip-flop.

An SR flip Flop is an arrangement of logic gates that maintains a stable output even after the inputs are turned off. This simple flip flop circuit has a set input (S) and a reset input (R). The set input causes the output of 0 (top output) and 1 (bottom output).
S=1, R=1 is state forbidden in SR flip flop. The flip flop does not get damaged in forbidden state (S=R=1). It is called forbidden because there is no definitive gurantee of a fixed output.

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