Design of T Flip Flop

Design of T Flip Flop
Design of T Flip Flop

Flip-flop design is fundamental in digital electronics. Flip-flops store one bit of data and are used for memory, data transfer, and synchronization in digital circuits. T flip-flops switch output based on clock signals.SR, JK, and D flip-flops make T flip-flops. Circuit needs determine flip-flop type, which has perks and cons. T flip-flops’ truth tables and time graphics illustrate their operation.

This article discusses T flip-flop design using SR, JK, and D flip-flops, their workings, truth tables, and timing diagrams. Flip-flop types and digital circuit applications will be compared. This page is for T flip-flop designers and digital electronics students and professionals.

Basics of Flip-Flops

Flip-flops are one-bit digital circuits. Digital electronics and computers use it extensively. SR, JK, and D flip-flops are the most prevalent.

SR Flip-Flop

Set-Reset flip-flops are SR flip-flops. Its inputs are Set (S) and Reset (R), while its outputs are Q and Q’. Q output is 1 when S input is 1, even if S input returns to 0. When the R input is 1, the Q output is 0 and stays 0 if the R input returns to 0. S and R inputs set to 1 place the flip-flop into an indeterminate state.

JK Flip-Flop

JK flip-flops improve on SR flip-flops. J and K are its inputs, whereas Q and Q’ are its outputs. The Q output is 1 when J is 1 and K is 0. Q outputs 0 when K and J inputs are 1 and 0. When J and K inputs are set to 1, the flip-flop toggles its state, turning Q output from 1 to 0 and vice versa.

D Flip-Flop

The D flip-flop is easiest. D is its input, Q and Q’ its outputs. When D is 1, Q outputs 1. Q outputs 0 when D is 0. The D flip-flop delays input signals by one clock cycle, hence its name.Flip-flops are essential to digital electronics. The most popular flip-flops are SR, JK, and D. Class characteristics and usage vary.

Design of T Flip-Flop

Conceptual Overview

T Flip-Flops switch output states based on clock input. Build the T Flip-Flop with SR, JK, and D flip-flops. T Flip-Flop circuits are popular in counters, frequency dividers, and shift registers.

T Flip-Flop Using SR Flip-Flop

Connecting the S and R inputs of an SR Flip-Flop creates the T Flip-Flop. A high clock input toggles the output between 0 and 1. The T Flip-Flop truth table using SR Flip-Flop is below:

T Qn Qn+1
0 0 0
1 0 1
0 1 1
1 1 0

T Flip-Flop Using JK Flip-Flop

A JK Flip-Flop can be used to design the T Flip-Flop by connecting the J and K inputs to the T input. The output switches between 0 and 1 when the clock input is high. The T Flip-Flop truth table utilizing JK Flip-Flop is below:

T Qn Qn+1
0 0 0
1 0 1
0 1 1
1 1 0

T Flip-Flop Using D Flip-Flop

D Flip-Flops can be used to create the T Flip-Flop by connecting the D input to the XOR gate output of the Q output and T input. The output switches between 0 and 1 when the clock input is high. The T Flip-Flop truth table utilizing D Flip-Flop is below:

T Qn Qn+1
0 0 0
1 0 1
0 1 1
1 1 0

Finally, the T Flip-Flop can be used with other flip-flops to create a versatile circuit. Due to its clock-driven output switching, the T Flip-Flop is commonly utilized in digital circuits.

T Flip-Flop Operation

Working Principle

T Flip-Flops toggle output based on input. SR, JK, and D flip-flops can be used to build the T Flip-Flop circuit. “Toggle Flip-Flop” describes the T Flip-Flop circuit.

The T Flip-Flop circuit is created by connecting an XOR gate output to a D Flip-Flop input. The T input and D Flip-Flop output feed the XOR gate. The D Flip-Flop input is coupled to the XOR gate output.

The XOR gate output complements the D Flip-Flop output when T is high. The D Flip-Flop output toggles. The D Flip-Flop output will stay the same when the T input is low since the XOR gate output is the same as it.

Truth-Table Analysis

Below is the T Flip-Flop truth table:

T Q(t) Q(t+1)
0 0 0
0 1 1
1 0 1
1 1 0

T Flip-Flop output remains the same when T input is low, says the truth table. High T input toggles T Flip-Flop output.Basic, functional flip-flop circuits use many flip-flops. Counters, frequency dividers, and shift registers use T Flip-Flops.

Application of T-Flop

Toggling digital circuits use T flip-flops. These are common T flip-flop uses:

  • Divide two input frequencies with the T flip-flop. Divide frequency by 4 by connecting T flip-flop output to another T flip-flop clock input. Add T flip-flops for frequency division.
  • PWM signals come from T flip-flops. A low-pass filter on the T flip-flop output creates motor control PWM.
    T-flip-flops are flexible communication, control, and computer architecture components.
  • T-flip-flops are necessary for digital counters. Make binary or divide-by-2 counter stages with T flip-flops.
  • A 1-bit T flip-flop stores data. T high toggles the output to its counterpart till T is altered. Memory can be T flip-flops in sequential circuits.

Advantages and Limitations

T flip-flop has certain advantages and limitations, which are as follows:


  • Applications that toggle the output state benefit from T flip-flops.
  • Uses include frequency division, counting, and state machines.
  • Implementing it with SR, JK, or D flip-flops is easy.
  • It just needs a clock signal and one input, making it hardware-efficient.


  • T flip-flops are unsuitable for synchronous or asynchronous reset applications.
  • It is not suitable for applications that require explicit output state setting or clearing.
  • When the input signal is unstable during the clock transition, it can glitch or error.
  • Edge detection and debouncing may require additional circuitry.

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