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Difference between RS flipflop and JK flipflop based on it basic operation.Explain

RS Flip-flop:

The circuit diagram and truth table of RS flip-flop are given below:

SR flip flop

The truth table for SR flip-flops is:

S

R

Q(t)

Q(t + 1)

0

0

0

0

No changes

0

0

1

1

0

1

0

0

reset to 0

0

1

1

0

1

0

0

1

set to 1

1

0

1

1

1

1

0

Invalid

Don’t care

1

1

1

Invalid

S = R = 0 is the normal resting condition of the SR flip-flop.

It has no effect on the output state of the flip-flop. Both Q(t) and Q(t+1) outputs remain in the logic state they were in prior to this input condition.

JK Flip Flop:

The circuit diagram and truth table of JK flip-flop are given below:

JK Flip flop

Truth Table for J-K flip flop is as follows:

J

K

Q

Q̅ 

Description

0

0

0

0

 No Change

0

0

0

1

   No Change

0

1

1

0

Reset to 0

0

1

0

1

   Reset to 0

1

0

0

1

Set to 1

1

0

1

0

      Set to 1

1

1

0

1

Toggle

1

1

1

0

Toggle

Observation:

From the above truth table, if the two inputs are high, then the output of SR flip flop is Don’t care but JK flip flop provides Toggled output.

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