ISRO Electronics & Communication (ECE) 2017-2 - Question 27

Topic: Digital Electronics

The following CMOS transistor based circuit with A, B, C as input and X, Y as output represents which circuit?

• A. Positive edge trigger J-K Flip-Flop
• B. Negative edge trigger J-K Flip-Flop
• C. Positive edge trigger S-R Flip-Flop
• D. None of the above

Answer: C. Positive edge trigger S-R Flip-Flop

Explanation: When $C=1$ and $A=1$, $B=1 \Rightarrow X=0$ and $Y=0$. Thus it represents an SR flip-flop with positive edge trigger.