Which of the following is a sequential circuit ?
Counter
A combinational circuit produces outputs that depend only on the present inputs. A sequential circuit has memory: its output depends on the present inputs and on the past history of inputs, which is held in storage elements such as flip-flops and advanced by a clock.
A counter is built from a chain of flip-flops whose stored state changes on every clock pulse; the next count depends on the current stored count, so it needs memory and is a sequential circuit.
A multiplexer only routes one of its data inputs to the output according to the select lines, a decoder only activates one output line for each input code, and a full adder only forms the sum and carry of three input bits. None of these stores any state, so all three are combinational circuits.
Counter option is correct.
Similar Questions
The output of a sequential circuit depends on
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 :
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