Question 1

What is the JK flip-flop truth table?

Accepted Answer

The JK flip-flop has four states: J=0, K=0 → Hold (Q stays same); J=0, K=1 → Reset (Q=0); J=1, K=0 → Set (Q=1); J=1, K=1 → Toggle (Q flips). This makes it the most versatile flip-flop, capable of all operations.

Question 2

Why is JK called the universal flip-flop?

Accepted Answer

JK is universal because it can perform ALL flip-flop operations: Set, Reset, Hold, and Toggle. You can configure a JK to work like a D flip-flop, T flip-flop, or SR flip-flop by connecting its inputs appropriately.

Question 3

How do you convert JK to D flip-flop?

Accepted Answer

Connect D to J, and connect NOT(D) to K. When D=1: J=1, K=0 (Set). When D=0: J=0, K=1 (Reset). This gives you D flip-flop behavior where Q follows D.

Question 4

What is the advantage of JK over SR flip-flop?

Accepted Answer

The JK flip-flop solves the SR flip-flop's forbidden state problem. When J=K=1, instead of an undefined state, the JK flip-flop toggles. This makes JK more reliable and useful in digital circuits.

JK Flip-Flop Truth Table – The Universal Flip-Flop Calculator

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