Types of flip flop circuits pdf

Now let us see the types of flip flop circuits that are being used in digital circuits. They can be classified according to the number of inputs they possess and the manner in which they affect the binary state of the flip-flop. This type of flip-flop is very similar to the one we discussed in the basic circuit.

But however a certain difference exists. In this flip-flop circuit an additional control input is applied. This additional control input determines the when the state of the circuit is to be changed. This additional input is nothing but the clock pulse. The RS flip-flop consists of basic flip-flop circuit along with two additional NAND gates and a clock pulse generator.

The clock pulse acts as an enable signal for the two inputs. This is nothing but the quiescent condition of the flip-flop. Now let us see how it works. The set state is reached at this condition and since the clock pulse is 1, information from S and R is allowed to reach output. From the truth table of NAND gate we can say that the output is 0 only when both the inputs are 1. In all the other case the output is 1.

The design of the FF was used in the British Colossus code-breaking computer the year The transistorized versions of these circuits were common in computers, even after the overview of integrated circuits , though FFs made from logic gates are also common now.

The first flip-flop circuit was known differently as multivibrators or trigger circuits. The major differences between these kinds of FFs and latches are the number of inputs they have and how they alter the states. There are different differences for each kind of FFs and latches which can increase their operations.

Please follow the below link to know more about Different types of flip flop conversion. This kind of flip flop is stated to as an SR flip flop or SR latch. The FF includes two states shown in the following figure.

The binary state of the flip flop is taken to be the normal output value. In regular operation, this ailment must be neglected by making sure that ones are not applied to both the inputs concurrently. The simplification of the SR flip flop is nothing but D flip-flop which is shown in the figure. The D-input is sampled throughout the existence of a CLK pulse.

If it is 1, then the FF is switched to the set state. If it is 0, then the FF switches to a clear state. The JK flip-flop operates with only positive or negative clock transitions. The operation of the JK flip-flop is similar to the SR flip-flop. When the input J and K are different then the output Q takes the value of J at the next clock edge.

When J and K both are low then NO change occurs at the output. If both J and K are high, then at the clock edge, the output will toggle from one state to the other. In a D flip-flop, the output can only be changed at positive or negative clock transitions, and when the inputs changed at other times, the output will remain unaffected.

The D flip-flops are generally used for shift-registers and counters.