🪴 TJ's Notes 1.0

Digital Logic Design Lab 7

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Experiment 7

Name: Tejas Sahoo

Roll No: K057

B-Tech CSE (Cyber Security) Batch K2

Date: 1/10/24

Aim

To verify the truth table and timing diagram of RS, JK, T, and D flip-flops using NAND and NOR gate ICs, and to analyze the circuit of RS, JK, T, and D flip-flops with the help of LED displays.

Theory

Introduction

A flip-flop is an electronic circuit with two stable states used to store binary data. The stored data can be altered by applying varying inputs. Flip-flops are essential building blocks in digital electronics systems, widely used in computers, communication systems, and other applications.

Types of Flip-Flops:

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

1. RS Flip-Flop

The RS (Reset-Set) flip-flop stores data and provides feedback from its outputs to its inputs. It has three inputs: Set, Reset, and Clock.

Figure-1: RS Flip-Flop Circuit Diagram
Figure-2: Characteristics Table of RS Flip-Flop

2. D Flip-Flop

The D (Data) flip-flop is derived from the RS flip-flop by complementing the R input and directly connecting the S input to the data input. It ensures no unpredictable states when both inputs are high.

Figure-3: D Flip-Flop Circuit Diagram
Figure-4: Characteristics Table of D Flip-Flop

3. JK Flip-Flop

The JK flip-flop resolves the indeterminate state of the RS flip-flop when both inputs are high. When J and K are 1, the outputs toggle.

Figure-5: JK Flip-Flop Circuit Diagram
Figure-6: Characteristics Table of JK Flip-Flop

4. T Flip-Flop

The T (Toggle) flip-flop is a modified JK flip-flop, with both inputs held at logic 1. The output toggles between states with each clock pulse.

Figure-7: T Flip-Flop Circuit Diagram
Figure-8: Characteristics Table of T Flip-Flop

Procedure

1. RS Flip-Flop Simulation

  1. Connect the supply (+5V) to the circuit.
  2. Press “ADD” to add the initial output state in the table.
  3. Set the inputs “S” and “R,” then apply the clock pulse.
  4. Press “ADD” to record inputs and outputs in the table and graph.
  5. Repeat steps 3 and 4 for the next input states.
  6. Press “Print” to save the simulation results.

2. D Flip-Flop Simulation

  1. Connect the supply (+5V) to the circuit.
  2. Press “ADD” to add the initial output state in the table.
  3. Set the inputs “D” and “Clock.”
  4. Press “ADD” to record inputs and outputs in the table and graph.
  5. Repeat steps 3 and 4 for the next input states.
  6. Press “Print” to save the simulation results.

3. JK Flip-Flop Simulation

  1. Connect the supply (+5V) to the circuit.
  2. Press “ADD” to add the initial output state in the table.
  3. Set the inputs “J” and “K,” then apply the clock pulse.
  4. Press “ADD” to record inputs and outputs in the table and graph.
  5. Repeat steps 3 and 4 for the next input states.
  6. Press “Print” to save the simulation results.

4. T Flip-Flop Simulation

  1. Connect the supply (+5V) to the circuit.
  2. Press “ADD” to add the initial output state in the table.
  3. Set the input “T,” then apply the clock pulse.
  4. Press “ADD” to record inputs and outputs in the table and graph.
  5. Press “Print” to save the simulation results.

Conclusion

Using the IIT Roorkee Virtual Lab, we successfully simulated and verified the truth tables and timing diagrams of RS, D, JK, and T flip-flops.

Graph View

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