Question

Which of the circuits below are synchronous sequential circuits? Explain.

A) Circuit 1
B) Circuit 2
C) Circuit 3
D) Circuits 2 and 3

Answer 1

D. Circuit 2 and Circuit 3 are synchronous sequential circuits because they contain flip-flops and the changes in their logic states occur at discrete time intervals.

Step-by-step explanation:

A synchronous sequential circuit is a digital circuit that has a feedback path and, in which, the logic states of its flip-flops or memory elements change at discrete intervals of time in a synchronized manner.

Circuit 1 is not a synchronous sequential circuit because it does not have any flip-flops or memory elements that change state at discrete time intervals.

Circuit 2 is a synchronous sequential circuit because it contains flip-flops and the changes in their logic states occur at discrete time intervals.

Circuit 3 is also a synchronous sequential circuit because it contains flip-flops and the changes in their logic states occur at discrete time intervals.

Therefore, the circuits that are synchronous sequential circuits are Circuit 2 and Circuit 3, which means the correct answer is D) Circuits 2 and 3.