Exam-style question
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Which of the following best describes a key feature that distinguishes a sequential logic circuit from a combinational logic circuit?.
- A.Output depends only on current inputs
- B.Output depends on current inputs and past inputs
- C.Uses only logic gates
- D.Has no memory elements
Model answer
What a good answer should say
- Output depends on current inputs and past inputs
Explanation
Why this works
Define both: a combinational logic circuit produces outputs that are a function of the present inputs only, whereas a sequential logic circuit produces outputs that are a function of the present inputs and the stored past state. Identify key difference: the presence of memory in sequential circuits.
Explain when each applies: combinational circuits are used when no state is required, such as simple arithmetic gates; sequential circuits are used when state must be remembered, such as flip‑flops in registers. Conclude: the option that states the output depends on both current and past inputs correctly identifies the distinguishing feature of sequential logic.
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