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In the sequential circuit shown below, if the initial value of the output $Q_1Q_0$ is $00$. What are the next four values of $Q_1Q_0$?

 

  1. $11$, $10$, $01$, $00$
  2. $10$, $11$, $01$, $00$
  3. $10$, $00$, $01$, $11$
  4. $11$, $10$, $00$, $01$
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10 Answers

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Trick method 

As this is an asynchronous circuit containing T flip Flops such circuits are either down counters or up counters

Up Counter

when we have +ve edge triggered clock for next T flip flop i.e T responds if previous output changes from 0-1

Down Counter 

when we have -ve edge triggered clock for next T flip flop i.e T responds if previous output changes from 1-0

here it is a down counter so it will count 3->2->1->0

Option (A) answer

Answer:

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