# Difference between Latches and Flip- Flops

## Latch

A Latch is an electronic device that instantly changes its output based on the applied input. We use latch to store either 0 or 1 at any specified time. The "SET" and "RESET" are two inputs in a latch, and there are two outputs that are complement to each other. We use latch to store one bit of data and it is a memory device. A latch is just like a flip-flop, but latch is not a synchronous device. The Latch does not work on the clock edges like the flipflop.

## Flip-Flop

Flip-flop is a digital memory circuit, and with the help of the flip-flop we can store one bit of information. The fundamental blocks of various sequential circuits are flip-flops. Flip-flop is also called a bistable multivibrator or one-bit or binary. In a sequential circuit, we use flip-flops as a memory element.

In a sequential circuit, the output is obtained from the combinational circuit or flip-flop or both. When the clock pulse is active, then the state of the flip-flop is active, and when the clock pulse is not active, then the state of the clock pulse remains unaffected. Mainly, in the synchronous sequential circuit, flip flops function as a memory element, and in asynchronous sequential circuit, the unclocked flip flops or latches function as a memory element.

Mostly, there are four types of Flip-Flops:

• Set-Reset (SR) Flip-Flop
• JK Flip-Flop
• D (Data or Delay) Flip-Flop
• T (Toggle) Flip-Flop

## Difference Between Latch and Flip-Flop

S.No LATCH FLIP-FLOP
1. A Latch is a bistable device, and the state of the latch is represented as 0 and 1. Flip-Flop is also a bistable device and there are two stable states of Flip-Flop, which are represented as 0 and 1.
2. A Latch is a level triggered device. Flip-flop is an edge triggered device.
3. We cannot classify the Latch. We can classify the flip-flop as synchronous or asynchronous flipflops.
4. To form sequential circuits, latches are constructed from logic gates. To form sequential circuits, Flip-Flop is constructed from latches along with an additional clock signal.
5. Latches are fast as compared to the Flip-Flop. Flip-Flops are slow as compared to the latches.
6. Less power is consumed by the Latches. More power is consumed by the Flip-Flop.
7. The latches can be clocked or clockless. For all the time, Flip-Flops are clocked.
8. Only binary inputs can be used to operate the latches. By the clock signal and binary input, the Flip-Flop works.
9. The latch is sensitive to the input and as long as it is 'On', we can transmit the data. Flip-Flop is sensitive to the clock signals and until there is a change in the input clock signal, it never changes the output.
10. The latch cannot be used as a register because the register requires more advanced electronic circuits where time plays an essential role. Flip-Flop can work as a register because it contains clock signals in its input.
11. The latch is asynchronous because latch does not work on the basis of the time signal. Flip-Flop is synchronous because flip-flop work on the basis of the clock signal.
12. The latch cannot be built from the gates. Flip-Flop cannot be built from the latches.
13. Latches are responsive towards faults on enable pin. Flip-Flops are protected toward fault.

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