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GATE 2023 CS – Question 21

Digital Logic · Sequential Circuits · 1 mark · Multiple choice

The output of a 2-input multiplexer is connected back to one of its inputs as shown in the figure. [Figure: 2-input MUX with inputs 0 and 1, select S, output Q; Q is fed back to input 0.] Match the functional equivalence of this circuit to one of the following options.

Diagram for GATE 2023 CS question 21
  1. D Flip-flop
  2. D Latch
  3. Half-adder
  4. Demultiplexer

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Show answer and explanation

Correct answer: (B) D Latch

Explanation

With Q fed back, the output equals the data input when S selects it (transparent) and holds its value otherwise. This is level-sensitive storage, i.e. a D latch.