Question:
The basic sequential logic building block in which the output follows the data input as long as the ENABLE input is active, is
The basic sequential logic building block in which the output follows the data input as long as the ENABLE input is active, is
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Latch $=$ Level-triggered (Transparent).
Flip-Flop $=$ Edge-triggered (Non-transparent).
Flip-Flop $=$ Edge-triggered (Non-transparent).
Updated On: Mar 12, 2026
- J-K flip flop
- D flip flop
- T flip flop
- D latch
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
A transparent device is one where the output is a direct reflection of the input during the active period of the control signal. Latches are level-triggered, whereas flip-flops are edge-triggered.
Step 2: Detailed Explanation:
- D Flip-Flop: Only changes state at the clock edge. Between edges, it maintains its state regardless of input changes.
- D Latch: When the Enable (or Clock) signal is high, the output $Q$ follows the input $D$ continuously. If $D$ changes while Enable is high, $Q$ changes with it. This is known as transparency.
Step 3: Final Answer:
The building block described is a D latch.
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