What are flip flops and flip flop types

What are flip flops and flip flop types post thumbnail image

Flip Flop (What are Flip Flops?)

What are flip flops and flip flop types: Simply put, “Flip flop is a type of circuit which has two states (0 or 1). And it is used to store state information.

A flip-flop is a sequential logic circuit. Which is capable of storing one bit. The output of the flip flop is stable. And it carries only two values ​​like high voltage or low voltage: One output will either be 0 or it will be 1.

Flip Flop is a binary storage device. This binary bit can store 0 or 1. It is the smallest storage unit of a computer like: It stores a single bit (0 or 1). The number of external inputs depends on the type of flip flop.

Flip flop is also called stable multi-vibrator. It was first developed by William Eccels and FW Jordan in 1918.

Generally two output lines are available in flip flops which are opposite to each other.

Most of the people get confused between flip flops and latch, flip flops and latch are both circuits and both works to store information. One difference between flip flop and latch is that whenever the input of the latch is changed, the output also changes.

Whereas Flip Flop is a combination of latch and clock, it is made up of latch and clock. It keeps control operation on the clock output, so the output does not change and it depends on the clock. The clock is used in the flip flop so that when the input changes, there is no difference on the functionality or internal logic of the flip flop.

Flip flop is also called stable multi-vibrator. It was first developed by William Eccels and FW Jordan in 1918.

Generally, two output lines are available in flip flops which are opposite to each other.

Most of the people get confused between flip flops and latch, flip flops and latch are both circuits and both works to store information. One difference between flip flop and latch is that whenever the input of the latch is changed, the output also changes.

Whereas Flip Flop is a combination of latch and clock, it is made up of latch and clock. It keeps control operation on the clock output, so the output does not change and it depends on the clock. The clock is used in the flip flop so that when the input changes, there is no difference on the functionality or internal logic of the flip flop.

  1. Edge
  2. Level

You can also read: What Is a Logic Gate and What Are Its Types?

Table of Content:

Types of Flip Flops

Here are four types of Flip Flops –

  1. RS Flip Flop
  2. JK Flip Flop
  3. D Flip Flop
  4. T Flip Flop

1. RS Flip Flop

RS Flip Flops are Basic or Fundamental Flip Flops because all Flip Flops are generated from RS Flip Flop only. Where RS Flip Flop has two external inputs R (reset) and S (set). When R is active ( R=1) the output is reset Q=0 and when S is active ( S=1 ) the output is set Q=1.

RS Flip Flops is also called Bistable multivibrator. To make an RS Flip Flop, two NAND or NOR gates are used.

Here we have made a flip flop using two NOR GATE-

Block Diagram

SR Flip Flop
What are flip flops and flip flop types

Logic Diagram of RS Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Truth Table of RS Flip Flop

CLKSRQ~Q
0xxNo ChangeNo change
100
10101
11010
111Not DetermineNot Determine
What are flip flops and flip flop types

2. JK Flip Flop

JK Flip Flops make up for a shortcoming of RS Flip Flops. The main disadvantage of RS Flip Flop is that when the clock is triggered in this, both the inputs should not be high. That is, we cannot use a set (1,1) of input in RS Flip Flop. But in JK Flip Flop we can use this input set (1,1).

This flip flop was named after Jack Bilby. Jack Bilby discovered IC.

Block Diagram of JK Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Logic Diagram of JK Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Truth Table of JK Flip Flop

QJKQ(t+1)Remark
0000No Change
0010Reset
0101Set
0111Complement
1001No Change
1010Reset
1101Set
1110Complement
What are flip flops and flip flop types

3. D Flip Flop 

D Flip Flops are used to create delay if a delay is needed inside a circuit.
In D Flip Flop, the same output is obtained as the input is given: – If 1 input is given then the output will also come as 1 or if 0 input is given then the output will also be 0. D Flip Flop is also called delayed Flip Flop. This is a single input flip flop. There is no race condition in it either.

Block Diagram of D Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Logic Diagram of D Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Truth Table of D Flip Flop

CLKDQ
0xNo Change
100
111
What are flip flops and flip flop types

4. T Flip Flop 

T Flip Flop is a single input flip flop. This is a simpler version of JK Flip Flop. T Flip Flop is also called toggle Flip Flop. T Flip Flop is widely used in counters, it is a sequential circuit that changes state after each clock pulse.

Block Diagram of T Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Logic Diagram of T Flip Flop

What are flip flops and flip flop types
What are flip flops and flip flop types

Truth Table of D Flip Flop

TQ (t+!)
0Q
1~Q
What are flip flops and flip flop types

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Avinash Singh

I am Avinash Singh, a software engineer from the profession and have been working in the IT industry since 2009. I live in Barabanki district of Uttar Pradesh in India and completed intermediate in 2001 from Ram Sevak Inter College, a UP Board school. After inter I completed my professional degree (BCA & MCA) from Indira Gandhi National Open University, Delhi in 2008 and along with it I did many certifications to keep my knowledge up to date and the next year I started a software development company E – Vision Technocraft Pvt Ltd.

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