Published on June 28, 2025 KembaraXtra-Computer Science-JK Flip-Flop Computer Science KembaraXtra-Computer Science - JK Flip-Flop 1. Flip-Flops vs. Latches Flip-Flop: A 1-bit memory device that uses a clock to control state changes. Latch: A memory device without a clock. Changes state immediately based on input. Important Note: Terminology can be inconsistent. This guide uses the definitions above. 2. JK Flip-Flop Overview Purpose: A clocked 1-bit memory element. Analogy to SR Latch: J input acts like S (Set). K input acts like R (Reset). Key Differences from SR Latch: i. Clocked Operation: State changes only occur with a clock pulse. ii. Toggle Functionality: When both J and K are high (1), the output toggles (inverts) its state on each clock pulse. 3. JK Flip-Flop Functionality Table J K Clock Q (Output) Operation 0 0 Pulse Maintain previous value Hold 0 1 Pulse 0 Reset 1 0 Pulse 1 Set 1 1 Pulse Inverse of previous value Toggle (Invert) Understanding the Table: The output Q changes only on the active edge of the clock pulse, and only if J or K (or both) are high. 4. JK Flip-Flop Symbols Positive Edge-Triggered: Changes state on the rising edge of the clock pulse. Negative Edge-Triggered: Changes state on the falling edge of the clock pulse. Indicated by a circle on the clock (CLK) input. 5. Key Concepts to Remember Clocked Operation: The flip-flop only responds to inputs J and K when a clock pulse occurs. Edge-Triggering: Changes happen on a specific edge (rising or falling) of the clock pulse. Toggle: J=1, K=1 inverts the output with each clock pulse.
