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

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

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

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

Here the required flip-flop is SR flip-flop

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

 S R 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 X 1 1 1 X

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

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

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

 QN QN+1 J K 0 0 0 X 0 1 1 X 1 0 X 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 SR flip-flop from JK flip-flop is as follows

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

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

In this case the given flip-flop is JK.

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

K-Map for J:

Expression for J would be

J = S

Now, K-Map for K:

Therefore, Expression for K would be

K = R

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

For this, connect the J input of the given flip-flop (JK flip-flop) to S as obtained from the expression of J.

And connect the K input of the JK flip-flop to R, as obtained from the expression of K.

Therefore, the circuit would be:

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