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JK Flip-flop

      A JK flip flop can be formed by D flip flop and some logic gates. Then this flip-flop type is very useful for constructing a register with complete feature such as shift left and right loading or parallel loading. The truth table and the structure is shown in figure below. The truth table is ran under the transition level low to high or high to low clock signal. If the block diagram is like the figure below, truth table is ran under low to high transition of clock signal. For high to low level transition, the block diagram is exist a circle at the input of the clock.

The output equation is

Q=D=JQ'+K'Q

Another advantages of this kind of flip-flop is can be constructed a state transition that can be applied as state machine.

 Figure 1. JK flip-flop and the truth table.

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