Question

Race Around condition can be avoided in Digital logic circuits using?

• A. Shift Register
• B. Master-Slave JK Flip Flop
• C. Full Adder
• D. AND Gate

Hint:

In a Master-Slave setup, the "Master" is active during the high level of the clock, and the "Slave" transfers the value on the falling edge, ensuring only one change per cycle.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The Race Around condition occurs in JK flip-flops when $J=1$, $K=1$, and the clock pulse width is larger than the propagation delay of the gates. This causes the output to toggle multiple times during a single clock pulse, leading to an unpredictable final state.
Step 2: Detailed Explanation:
There are three main ways to avoid this:
1. Making the clock pulse width smaller than the propagation delay (practically difficult).
2. Using edge-triggered flip-flops instead of level-triggered ones.
3. Using a Master-Slave JK flip-flop configuration, where the state is sampled during one part of the clock pulse and output during another, preventing multiple transitions.
Step 3: Final Answer:
The correct method listed is the Master-Slave JK Flip Flop.