D Flip Flop Conversion Techniques

D Flip Flop Conversion Techniques

D Flip Flop is primarily meant to provide delay as the output of this Flip Flop is same as the input. D Flip Flop can easily be made by using a SR Flip Flop or JK Flip Flop. But sometimes designers may be required to design other Flip Flops by using D Flip Flop. Here we discuss how to convert a D Flip Flop into JK and SR Flip Flops.

The first thing that needs to be done for converting one Flip Flop into another is to draw the truth table for both the Flip Flops. The next step is to create the equivalent K-Maps for the required outputs.

JK Flip Flop using D Flip Flop

To create a JK Flip Flop using D Flip Flop, first the conversion table is created as shown:

J K Qn Qn+1 D
0 0 0 0 0
0 0 1 1 1
0 1 0 0 0
0 1 1 0 0
1 0 0 1 1
1 0 1 1 1
1 1 0 1 1
1 1 1 0 0

X—Dont care


The K-Map for the required input-output relation is:

K-Map Solution for D - JK Flip Flop using D Flip Flop

K-Map Solution for D – JK Flip Flop using D Flip Flop

So, a logic diagram can be developed on the basis of these relations as:

JK Flip Flop using D Flip Flop - Logic Diagram

JK Flip Flop using D Flip Flop – Logic Diagram

SR Flip Flop using D Flip Flop

To create a SR Flip Flop using D Flip Flop, first the conversion table is created as shown:

S R Q n Q n+1 D
0 0 0 0 0
0 0 1 1 1
0 1 0 0 0
0 1 1 0 0
1 0 0 1 1
1 0 1 1 1
1 1 X X X
1 1 X X X

X—Dont care
Q and Qn+1 are invalid for S=R=1.
The K-Map for the required input-output relation is:



K-Map for D - SR Flip Flop using D Flip Flop

K-Map for D – SR Flip Flop using D Flip Flop

Its logic diagram can be given as:

SR Flip Flop using D Flip Flop - Logic Diagram

SR Flip Flop using D Flip Flop – Logic Diagram

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  • Noor Mohammad

    I just got 20 extra credits on my exam because of this! Thanks guys!