### Flip flop Conversion – SR flip-flop to JK flip-flop

Here you would see how to implement a JK flip-flop from SR flip-flop step by step – “Flip flop Conversion – SR flip-flop to JK flip-flop”.

## Flip flop Conversion – SR flip-flop to JK flip-flop

### Step 1: Write the truth table of the required flip-flop

Here the required flip-flop is JK flip-flop

Hence you need to write the truth table of JK flip-flop which is

 J K QN QN+1 0 0 0 0 0 0 1 1 0 1 0 0 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 0

### Step 2: Write the excitation table of the given flip-flop

In this case the given flip-flop is SR flip-flop

Therefore you need to write the excitation table of SR flip-flop which is

 QN QN+1 S R 0 0 0 X 0 1 1 0 1 0 0 1 1 1 X 0

### Step 3: Write the conversion table

The conversion table, which is a combination of truth table and excitation table, to implement a JK flip-flop from SR flip-flop is as follows

 J K QN QN+1 S R 0 0 0 0 0 X 0 0 1 1 X 0 0 1 0 0 0 X 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 1 X 0 1 1 0 1 1 0 1 1 1 0 0 1

### Step 4: Find the Boolean expressions for the inputs of the given flip-flop.

In this case the given flip-flop is SR.

Therefore, write the Boolean expressions for S and R from the conversion table using K-Maps.

K-Map for S:

Expression for S would be

S = JQN/

K-Map for R:

Expression for R would be

R = KQN

### Step 5: Draw the circuit for implementing JK flip-flop using SR flip-flop

In this way a JK flip-flop can be implemented using a SR flip-flop. Hope this post on “Flip-flop Conversion – SR flip-flop to JK flip-flop” would help in clearing many doubts in flip-flop conversions.