Discussion
Which of the given options best describes the truthfulness of the following statements? i) The clock signal is required for sequential circuits. ii) In the sequential circuit, memory elements play an important role and are required.
Answer: A
Both statements are true. A sequential circuit changes state with a clock signal that times the changes, and its memory elements, such as flip-flops, store the state and are essential, since the output depends on past inputs as well as present ones. So the first option, i-True and ii-True, is correct and the other options each mark at least one true statement as false. Examples of memory elements in such circuits are latches and flip-flops, and examples of sequential circuits are counters and registers.
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