Flip‑Flops & Sequential Logic — A/L Physics

How do I practise Flip‑Flops & Sequential Logic?

1 question with a worked solution

1. In digital electronics, what fundamental characteristic distinguishes sequential logic circuits (such as flip-flops and registers) from combinational logic circuits?
   1. A) Sequential circuits can only be constructed using vacuum tubes rather than semiconductor transistors
   2. B) Sequential circuits contain memory elements whose current output depends on both current inputs and past states
   3. C) Sequential circuits have zero propagation delay and infinite frequency response
   4. D) Sequential circuits depend solely on present instantaneous inputs without any feedback or clock signals
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   Correct answer: B) Sequential circuits contain memory elements whose current output depends on both current inputs and past states

   Combinational circuits have outputs determined entirely by the instantaneous values of their present inputs (memoryless). Sequential circuits incorporate memory elements (flip-flops) and feedback loops, so that their present output depends on both current inputs and the internal stored past history (states).

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   Step 1: Combinational logic: Output = f(Present Inputs). Step 2: Sequential logic: Output = f(Present Inputs, Past States) using memory elements. Answer: Sequential circuits contain memory elements whose current output depends on both current inputs and past states.
   Modelled on: the A/L Physics examination pattern

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Where does Flip‑Flops & Sequential Logic fit in the syllabus?

Unit 9.8 · Year 2 · Term 2