This flip flop is a combination of a gated R-S flip flop and a clocked signal input. JK flip flop or JK-FF for short, is basically an improved R-S flip flop. The only difference is the JK flip flop has no forbidden input combination. The sequential logic operation of this JK flip flop is the same with the R-S flip flop with the same SET and RESET logic inputs. The J and K stand for Jack Kilby as this flip flop type inventor. This flip flop’s inputs are labelled with “J” and “K” just like “S” for SET and “R” for RESET in S-R flip flop. This basic JK flip flop is the most mainly used of all the flip flop circuits and is known as a universal flip flop. J and K is used to give honor to Jack Kilby as the inventor of this flip flop type. If the J and K input are different, the output Q will have the value of J at the next clock edge cycle. This flip flop uses two inputs labelled with J and K. We can say that the JK flip flop is the most versatile flip flop, because it has inputs like D flip flop with clock input.
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