In the given sequential circuit if the initial value of Q1Q0 = 00, then what are the next three values of Q1Q0?
In the given sequential circuit if the initial value of Q1Q0 = 00, then what are the next three values of Q1Q0?
Circuit: two T flip-flops in series. The first has T = 1 and is driven by the clock; its output Q0 is the clock input of the second flip-flop, whose T input is also 1 and whose output is Q1.
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Correct answer: (B) 11, 10, 01
Explanation
Q0 toggles on every clock and Q1 toggles whenever Q0 goes 0→1 (it is clocked by Q0). From 00: Q0→1 so Q1 toggles (11); then Q0→0 (10); then Q0→1 so Q1 toggles (01). This is a down counter.