Question:
Which of the following is NOT a combinational circuit?
Which of the following is NOT a combinational circuit?
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The key difference is memory. If a circuit has memory (like a flip-flop, latch, or register), it is sequential. If its output is purely a function of its current inputs, it is combinational.
Updated On: Jul 2, 2026
- Flip-Flop
- Decoder
- Multiplexer
- Adder
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The Correct Option is A
Solution and Explanation
Digital logic circuits are broadly classified into two types: combinational and sequential.
Combinational circuits are circuits whose output at any given time depends only on the present input values. Examples include Adders, Decoders, Multiplexers, and Demultiplexers.
Sequential circuits are circuits whose output depends on the present input values as well as the past sequence of inputs. They have memory elements to store past states.
A Flip-Flop is a fundamental memory element. Its output depends on its current state (stored value) and the current inputs.
Therefore, a Flip-Flop is a sequential circuit, not a combinational circuit.
Combinational circuits are circuits whose output at any given time depends only on the present input values. Examples include Adders, Decoders, Multiplexers, and Demultiplexers.
Sequential circuits are circuits whose output depends on the present input values as well as the past sequence of inputs. They have memory elements to store past states.
A Flip-Flop is a fundamental memory element. Its output depends on its current state (stored value) and the current inputs.
Therefore, a Flip-Flop is a sequential circuit, not a combinational circuit.
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