Conversion of JK flip flop to SR flip flop, T and D flip flop

29 Jun

Conversion of JK flip flop

Introduction:

We have discussed “how to convert SR flip flop into JK and D type of flip flop” in the last article. Now we are going to convert JK flip flop into different types of flip flops.

As explained in the last article, if we want to convert one type of flip flop into another type of flip flop, first we have to design a combinational circuit and after that connect it to the inputs of actual flip flop. So that the outputs of combinational circuit will be the inputs of actual flip flop and then it will produce same output as that of required flip flop.

We can convert JK flip flop into SR flip flop, T flip flop and D type of flip flop.

1)      Conversion of JK flip flop to SR flip flop:

In case of converting JK flip flop into SR flip flop, external inputs (inputs of combinational circuit) are S and R, while J and K are the inputs of actual flip flop.

So we have to get values of J and K in terms of S, R and Qn. thus we prepare a conversion table S, R, Qn, Qn+1, J and K.

The external inputs S and R and the output Qn can make 8 combinations. For each combination find the corresponding Qn+1.

In the SR flip flop, the combination S=1 and R=1 is not permitted. So, the corresponding output is invalid and, therefore the corresponding J and K are don’t cares.

Complete the table by writing the values of J and K required getting each Qn+1 from the corresponding Qn.

The conversion table, K-maps and Logic diagram for the conversion of JK flip flop to SR flip flop is shown below:

JK Flip Flop to SR Flip Flop 1

Conversion Table

JK Flip Flop to SR Flip Flop 2

Logic Diagram

JK Flip Flop to SR Flip Flop 3

K-Maps

2)      Conversion of JK flip flop to T flip flop:

For the conversion of JK flip flop to T type of flip flop, T will be the external input (input of combinational circuit) and the output of this combinational circuit is connected to the inputs of actual flip flop (J and K).

Then we prepare conversion table and using this table express J and K in terms of T and Qn.

The conversion table, K-Maps and logic diagram for the conversion of JK flip flop to T type of flip flop is shown below:

JK Flip Flop to T Flip Flop 1

Conversion Table

JK Flip Flop to T Flip Flop 2

Logic Diagram

JK Flip Flop to T Flip Flop 3

K-Maps

3)      Conversion of JK flip flop to D flip flop:

In case of converting JK flip flop into D flip flop, D is the external input of combinational circuit, whereas J and K are the inputs of actual flip flop.

D and Qn make four combinations. So, prepare a conversion table and using this table express J and K in terms of D and Qn.

The conversion table, K-map and logic diagram for the conversion of JK flip flop to D flip flop is shown below:

JK Flip Flop to D Flip Flop 1

Conversion Table

JK Flip Flop to D Flip Flop 3

K-Maps

JK Flip Flop to D Flip Flop 2

Logic Diagram

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tags: convert t flip flop to d flip flop, d flip flop to t flip flop conversion

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