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

__Flip-flop Conversion – JK flip-flop to D flip-flop__

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

Here the required flip-flop is D- flip-flop

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

D |
Q |
Q |

0 |
0 |
0 |

0 |
1 |
0 |

1 |
0 |
1 |

1 |
1 |
1 |

### 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

Q |
Q |
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 D flip-flop from JK flip-flop is as follows

D |
Q |
Q |
J |
K |

0 |
0 |
0 |
0 |
X |

0 |
1 |
0 |
X |
1 |

1 |
0 |
1 |
1 |
X |

1 |
1 |
1 |
X |
0 |

### 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 = D

Now, K-Map for K:

Therefore, Expression for K would be

K = D^{/}

^{}

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

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

And connect the K input of the JK flip-flop to D^{/},
as obtained from the expression of K.

Therefore, the circuit would be:

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

**Related Links:**

- Flip-flop Conversion – SR flip-flop to JK flip-flop
- Flip-flop Conversion – SR flip-flop to D flip-flop
- Flip-flop Conversion – D flip-flop to SR flip-flop
- Flip-flop Conversion – JK flip-flop to SR flip-flop
- Flip-flop Conversion – JK flip-flop to T flip-flop
- Flip-flop Conversion – T flip-flop to D flip-flop
- Flip-flop Conversion – T flip-flop to SR flip-flop
- Flip flop Conversion – D flip-flop to T flip-flop
- Flip flop Conversion – SR flip-flop to T flip-flop
- Flip flop Conversion – T flip-flop to JK flip-flop
- Flip flop Conversion – D flip-flop to JK flip-flop

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