D Flip-Flop

D-FLIP-FlOP

The D (data) flip flop is a slight modification of the SR flip flop . An SR flip flop is converted to a D flip flop by inserting an Inverter between S and R and assigning the symbol D to the single input. The D input is sampled during the occurrence of a clock transition from 0 to 1. If D=1, the output of the flip flop goes to the 0 state.

Block Diagram of D flip flop :

                              

click here for J-K flip flop

Characteristic of D-Flip-flop:

                       

          From the characterstic table of the D flip flop are Q is determined by D input. Q output of the flip flop receive its value from the D input every time that the clock signal goes through a transition from 0 to 1.

Circuit Diagram of D flip flop :

J-K flip flop

Flip flop , JK flip flop, SR flip flop, D flip flop, T flip flop

                                                           J-K Flip Flop

    A J-K Flip Flop is the refinement of S-R flip flop. Inputs J and K behaves like input S and R to set and clear the flip flop respectively. When inputs J and K are both equal to 1, a clock transition switches the outputs of the flip-flop to their complement state.

Block Diagram of J-K flip flop

Block diagram of jk flip flop

                                                Circuit Diagram of J-K flip flop

The J input is equivalent to the S(set) input of the SR flip-flop and the K input is equivalent top the R (clear) Input. Instead of the indeterminate condition, the JK flip flop has a complement condition Q(t+1)=Q’(t) when both J and K are equal to 1

                                          Truth Table of J-K flip flop
                                       
The truth table of jk flip flop -

click here for => D flip flop

click here for => SR flip flop

Flip flop , JK flip flop, SR flip flop, D flip flop, T flip flop

Introduction to Flip Flops

• The digital circuit considered thus far have been combinational , where the output at any given time are entirely dependent on the inputs that are present at the time .

• Almost every system has likely to have combinational circuit. Most system encountered in practice also include storage elements, which required the system be describe in terms of sequential circuit.

• The most common type of sequential circuit is synchronous type. Synchronous sequential circuit employ signals that affect the storage elements only at discrete

Instant of time .

The storage element employed in clocked sequential circuit are called flip flops

A flip flop is binary cell capable of storing 1 bit of information .

It has two output, one for the normal value and other for the complement value of the bit stored  in it.

Types of flip-flops

1.SR Flip-Flop

2.D Flip-Flop

3.J-K Flip-Flops

4.T Flip-Flops

5.Edge triggered Flip-Flops

6.Master-Slave flip Flops