Consider the following statements regarding combinational and sequential circuits. (A) Output of combinational circuits depends on the only current input. (B) Output of combinational circuit depends on the both current input and previous output. (C) Output of sequential circuit depends on the current input. (D) Output of sequential circuit depends on both current input and previous output. Choose the correct answer from the options given below :
(A) and (D) Only
A combinational circuit has no memory elements, so its outputs are a function of the present inputs alone. A sequential circuit contains memory (flip-flops or latches) and feeds its stored state back, so its outputs depend on the present inputs and on the past state, i.e. previous outputs.
(A) is true: the output of a combinational circuit depends only on the current input.
(B) is false: dependence on previous output requires memory and feedback, which combinational circuits lack.
(C) is incomplete and therefore not the correct description: a sequential circuit's output does not depend on the current input alone; it also depends on the stored state.
(D) is true: the output of a sequential circuit depends on both the current input and the previous output (present state).
So the correct description is given by (A) together with (D); the pairs using (B) or (C) misstate one of the circuit types.
(A) and (D) Only option is correct.
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