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In a RS flip-flop the input R=S=1 leads to an indeterminate output. The RS flip-flop circuit may be re-joined if both inputs are 1 than also the outputs are complement of each other as shown in characteristics table below.

Truth Table for JK flip-flop

Input

Output

Clk

J

K

Q

Q^’

0

X

X

Previous or Memory State

1

1

0

1

0

1

0

1

0

1

1

0

0

Previous or Memory State

1

1

1

Toggle State

T flip-flop is known as toggle flip-flop. The T flip-flop is modification of the J-K flip-flop. Both the JK inputs of the JK flip – flop are held at logic 1 and the clock signal continuous to change as shown in table below.

Truth Table of T flip-flop

Clk

T

Q

Q^’

0

1

 

Previous or memory state

0

0

1

0

1

1

Toggle state