Discussion
Which of the following is a SEQUENTIAL circuit ?
Answer: C
The sequential circuit is the REGISTER.
A sequential circuit's output depends on its inputs and on stored past state, so it needs memory elements. A register is a group of flip-flops that stores a binary word, clocked to load and hold data, so it is sequential.
Parity generators, adders and multiplexers are combinational circuits: their outputs depend only on the present inputs, and they contain no memory elements.
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