Which statement describes a JK flip-flop's behavior?

Which statement describes a JK flip-flop's behavior?

• A. It is a simple latch with no clock input.
• B. It toggles the output on every clock edge regardless of inputs.
• C. It toggles the output when both J and K inputs are high.
• D. It only sets or resets based on J or K independently of clock.

Answer: (C)

The essential idea is how a JK flip-flop updates its output at the clock edge based on J and K. On a clock transition, if both J and K are high, the output toggles its value (if Q was 0 it becomes 1, and if Q was 1 it becomes 0). This edge-triggered toggle is what defines the JK behavior: the toggle happens only when both inputs are high at the clock edge, while other input combinations drive set (J=1, K=0), reset (J=0, K=1), or hold (J=0, K=0). The other statements mischaracterize the device: a simple latch has no clock input; toggling on every clock edge regardless of inputs isn’t how JK works; and acting independently of the clock ignores the edge-triggered nature of the flip-flop.

The essential idea is how a JK flip-flop updates its output at the clock edge based on J and K. On a clock transition, if both J and K are high, the output toggles its value (if Q was 0 it becomes 1, and if Q was 1 it becomes 0). This edge-triggered toggle is what defines the JK behavior: the toggle happens only when both inputs are high at the clock edge, while other input combinations drive set (J=1, K=0), reset (J=0, K=1), or hold (J=0, K=0). The other statements mischaracterize the device: a simple latch has no clock input; toggling on every clock edge regardless of inputs isn’t how JK works; and acting independently of the clock ignores the edge-triggered nature of the flip-flop.