Modulus understanding — output repetition rate For a modulus-8 (MOD-8) counter, the final output pattern repeats how often relative to the input clock pulses?
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A8 clock pulses
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B16 clock pulses
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C24 clock pulses
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D32 clock pulses
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E4 clock pulses
Answer
Correct Answer: 8 clock pulses
Explanation
Introduction / Context:The modulus (MOD) of a counter indicates how many unique states it cycles through before repeating. Understanding this lets you predict output repetition and design timing divisions without simulating or breadboarding every case.
Given Data / Assumptions:
- A binary counter with modulus 8.
- States advance by one on each active clock edge.
- We consider the full cycle of the counter outputs.
Concept / Approach:A MOD-N counter has N distinct states. Thus, one full cycle of the count requires N clock pulses. When the Nth pulse occurs, the counter returns to the initial state and the output sequence repeats.
Step-by-Step Solution:
MOD-8 ⇒ 8 unique states.One state is produced per clock pulse.Therefore, repetition (final output occurs) once every 8 clock pulses.Verification / Alternative check:Enumerate the binary sequence 000 → 001 → 010 → 011 → 100 → 101 → 110 → 111 → back to 000. Count the transitions: eight pulses are consumed to return to the start.
Why Other Options Are Wrong:
- 16/24/32 pulses: correspond to larger moduli that do not apply.
- 4 pulses: would be MOD-4 behavior, not MOD-8.
Common Pitfalls:
- Confusing edge counts with state counts; each new state needs one clock.
Final Answer:8 clock pulses