[Actual] Difference Between Latch and Flip Flop Explained



The actual difference between Latch and Flip Flop is, Latch is the simplest memory circuit which has not any controlled input system or it is unclocked circuit but Flip Flop is a memory circuit which has a controlled input system or it uses clock pulses.
In this article, you will find all the key differences between the Flip Flop and Latch. But before you going to know the key differences, you should know the actual difference between Latch and Flip Flop.



First of all, let's know about the basics of Flip Flip and Latch.


What is Latch?



A latch is a simple sequential logic circuit which can store one bit of data at a time. As you see in the below figure, a latch circuit using NAND gate is shown. It is the simplest circuit which can store one bit of data at a time. The circuit is cross-connected, that means the output of one NAND gate is connected to the input of the other NAND gate.


Latch Circuit, SR Latch, Difference Between Latch and Flip Flop


Suppose we give 0 to the input 'Q'. So at the next cycle in Qn+1, the output will be the same as previous that is 0. Also, you may notice, when the Q is 0 then the Q' is 1. So the value of Q and Q' always complement each other.

So the conclusion is, we cannot control the output and input of the Latch circuit.





What is Flip Flop?



So basically, to control the inputs and outputs of the latch circuit, we add some extra circuits to the Latch circuit. Now the whole circuit is called Flip Flop. So Flip Flop is nothing but a Latch circuit with some control circuit.
Now, you may understand the actual difference between Latch and Flip Flop.


Flip Flop Circuit, SR Flip Flop, Difference Between Latch and Flip Flop



A simple flip flop circuit is shown in the above figure. When we use as Flip Flop circuit, we need to give clock pulse to the circuit. In this case, the edge triggering works. That means when the signal becomes low to high, or high to low the circuit will work which is shown in the above figure.



Difference Between Flip Flop and Latch, Latch VS Flip Flop



We can also use the Flip Flop Circuit as Latch Circuit. To use the Flip Flop circuit as Latch, we need to give a level triggering signal to the enable pin. That means when the signal is high, the circuit will work. This is shown in the above figure also.


So it is clear that there is an important difference between the Latch and Flip Flop is, Latch does not need any clock pulse but Flip Flop circuit needs a clock pulse.


Other comparisons between Latch and Flip Flop are given below.





Latch VS Flip Flop




SL
NO.
Latch
Flip Flop
1.
A latch is a basic memory circuit which can hold one bit of data at a time.
Flip Flop is nothing but a Latch circuit with an extra control circuit.
2.
Latch does not need any clock signals.
Flip Flop needs a clock signal
3.
Latches are very fast in operation.
Flip Flops are comparatively slow in operation.
4.
Latches consume less power as it contains less numbers of logic gates.
Flip Flops consume more power as it contains more logic gates than Latch.
5.
Register circuits cannot be made using Latches because latch does not need any clock signal.
Register circuit can be made using Flip Flop circuits.

6.
The working of Latches depends on the binary inputs only.
The working flip flop depends on the binary input as well as a clock signal.
7.
The different types of latches are, D-Latch, SR-Latch, JK-Latch, T-Latch.
The different types of Flip flops are, SR-Flip Flop, JK-Flip Flop, D-Flip Flop, T-Flip Flop


These were the important differences between Latch and Flip Flop.



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[Actual] Difference Between Latch and Flip Flop Explained [Actual] Difference Between Latch and Flip Flop Explained Reviewed by ETechnoG on 12:01 Rating: 5
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