Question

Which of the following flip-flop is called as universal flip-flop?

• A. D
• B. RS
• C. T
• D. JK

Hint:

The JK flip-flop is the "swiss army knife" of sequential logic. If you have JK flip-flops, you can build any counter or register required by simply changing the input wiring.

Answer 1

The Correct Option is D

In digital logic, a "Universal" component is one that can be configured to mimic the behavior of any other component in its class. 1. The JK Flip-Flop: The JK flip-flop is considered universal because it can be easily converted into an RS, D, or T flip-flop:

• To RS: Use the J and K inputs as S and R respectively (though JK is better because it eliminates the "invalid" state found in RS).

• To D (Delay): Connect J and K together through a NOT gate.

• To T (Toggle): Tie J and K inputs together and apply the same signal to both.

2. Handling the Invalid State: The primary reason the JK is superior to the RS flip-flop is that it handles the "1-1" input condition. While RS becomes "undetermined" or "invalid," the JK flip-flop simply toggles its output, making it the most robust and versatile of the basic flip-flop types.