Exam-style question
Try this first
Which of the following best describes a latch's response to input changes?.
- A.It changes output only on a clock edge.
- B.It changes output immediately when inputs change.
- C.It never changes output once set.
- D.It changes output only when both inputs are low.
Model answer
What a good answer should say
- It changes output immediately when inputs change.
Explanation
Why this works
Rule: A latch is level‑sensitive, so its output follows the inputs as soon as they change. Substitution: S=1, R=0.
Working: The latch output Q immediately becomes 1. Answer: The latch changes output immediately.
Conclusion: Latches respond instantly to input changes, unlike edge‑triggered flip‑flops.
Common mistake
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