Lab Report 1

DEPARTMENT OF MECHANICAL ENGINEERING FACULTY OF ENGINEERING COURSE

ELECTRONICS

CODE

KJS 3233

TITLE OF EXPERIMENT

COMBINATIONAL LOGIC CIRCUIT

EXPERIMENT NO.

1

NAME OF STUDENT

MOHD HADRI ARIF BIN SABAIN

MATRICS NO.

4143004811

LECTURER NAME

NUR JULIA NAZIM BULYA NAZIM

DATE OF SUBMISSION

25th APRIL 2017

COURSE LEARNING OUTCOME

CLO 5: Demonstrate laboratory experiment for digital electronics and microprocessor by using technical skills and engineering tools (PLO10).

Attendance Format MARKS

Results Discussion Conclusion

Total COMMENTS

Yes/No

Marks Given

Max Marks

TABLE OF CONTENTS 1.0 INTRODUCTION 1 2.0 OBJECTIVES 1 3.0 APPARATUS 1 4.0 PRE-LAB DIAGNOSTIC TEST 2 5.0 PROCEDURES 3 5.1 PART I 3 5.1.1 74LS08 GATE EXPERIMENT 3 5.1.2 74LS32 GATE EXPERIMENT 3 5.1.3 74LS04 GATE EXPERIMENT 4 5.1.4 74LS00 GATE EXPERIMENT 5 5.1.5 74LS02 GATE EXPERIMENT 5 5.1.6 74LS86 GATE EXPERIMENT 6 5.2 PART II 7 5.2.1 OR GATE WITH INVERTER INPUTS

7

5.2.2 CASCADED 3-INPUT OR GATES

7

5.3 PART III 8 5.3.1 3-INPUT MAJORITY GATE CIRCUIT

8

6.0 RESULTS 8 6.1 PART I 8 6.1.1 74LS08 GATE EXPERIMENT 8 6.1.2 74LS32 GATE EXPERIMENT 9 6.1.3 74LS04 GATE EXPERIMENT 10 6.1.4 74LS00 GATE EXPERIMENT



10

6.1.5 74LS02 GATE EXPERIMENT 11 6.1.6 74LS86 GATE EXPERIMENT 12 6.2 PART II 13 6.2.1 OR GATE WITH INVERTER INPUTS

13

6.2.2 CASCADED 3-INPUT OR GATES

14

6.3 PART III 15 6.3.1 3-INPUT MAJORITY GATE CIRCUIT

15

7.0 TASK (HOMEWORK) 16 7.1.1 RESULT (HOMEWORK) 17 8.0 APPENDIX 19

CONTENTS OF TABLE

Table 1: Table of pre-lab answers . 2 Table 2: AND GATE truth table 9 Table 3: OR GATE truth table 9 Table 4: NOT GATE truth table 10 Table 5: NAND GATE truth table 11 Table 6: NOR GATE truth table 11 Table 7: EXCLUSIVE OR GATE truth table

12

Table 8: Truth table for OR GATE with inverter inputs

13

Table 9: Truth table for cascaded 3 -Inputs OR GATE

14

Table 10: Truth table for 3-Input majority GATE

15

Table 11: Result Task (Homework) 17 Table 12: Result Task (Homework) 18



CONTENTS OF FIGURES Figure 1:74SL08 CONNECTION ............................................................................................. 3 Figure 2:74LS32 CONNECTION ............................................................................................. 3 Figure 3:74LS04 CONNECTION ............................................................................................. 4 Figure 4:74LS00 CONNECTION ............................................................................................. 5 Figure 5:74LS02 CONNECTION ............................................................................................. 5 Figure 6:74LS86 CONNECTION ............................................................................................. 6 Figure 7: OR GATE WITH INVERTER INPUTS................................................................... 7 Figure 8: CASCADED 3-Input OR GATES ............................................................................. 7 Figure 9: 3-INPUT MAJORITY GATE CIRCUIT ................................................................... 8 Figure 10: 74LS08 GATE EXPERIMENT ............................................................................... 8 Figure 11: 74LS32 GATE EXPERIMENT ............................................................................... 9 Figure 12: 74LS04 GATE EXPERIMENT ............................................................................. 10 Figure 13: 74LS00 GATE EXPERIMENT ............................................................................. 10 Figure 14: 74LS02 GATE EXPERIMENT ............................................................................. 11 Figure 15: 74LS86 GATE EXPERIMENT ............................................................................. 12 Figure 16: OR GATE WITH INVERTER INPUTS................................................................ 13 Figure 17: CASCADED 3-INPUT OR GATES ...................................................................... 14 Figure 18: 3-INPUT MAJORITY GATE CIRCUIT ............................................................... 15 Figure 19: Triple NAND Gate 74LS10 ................................................................................... 17

1.0 INTRODUCTION

In this experiment, familiarity with the elementary logic gates and their



usage for designing and implementing logic circuits are introduced. In this



experiment, conventional methods will be used, IC’s will be plugged on



a breadboard and connected with wires. In a binary digital system, infor



mation is represented by the combination of ONE’s and ZERO’s. Each



of these signal levels are indeed two non-overlapping ranges of voltages.



There are two ways to assign the Boolean 0 and 1 values to these



two voltage ranges: positive logic and negative logic interpretation. In



positive logic, the HIGH (H) voltage level is assigned as “1” whereas the



LOW (L) level is assigned as “0”. A logic gate (AND, OR, NAND, etc.)



is defined based on it is input-output characteristic, which is determined



by its internal structure.

2.0 OBJECTIVES

The objectives of this experiment is:



i. Wire up various digital logic gates on a breadboard and examine their



truth tables.



ii. Construct a 3-Input Majority Gate using NAND gates.

3.0 EQUIPMENT/APPARATUS

i. Digital Trainer



ii. Breadboard

iii. Components (74LS00, 74LS04, 74LS08, 74LS10, 74LS32, 74LS86, 74LS02)

1

4.0 PRE-LAB DIAGNOSTIC TEST QUESTION ANSWER Write the Boolean expression for a two input AND gate Y=AB When both inputs are HIGH, output will be 1-High Write the Boolean expression for two-input OR gate

Y=A+B

If inputs A and B are both LOW, output will be

0- Low

Write the Boolean expression for a two-input NAND gate

Y=AB

When both inputs are HIGH, output from NAND gate will be

0- Low

Write the Boolean expression for a two-input NOR logic gate

Y=A+B

Input A is LOW and input B is HIGH, output Y of the gate will be

0-Low

When both inputs are LOW, output Y of the NOR gate will be

1-High

Write the Boolean expression for a two-input XOR gate Y=AB+AB If both inputs HIGH, output Y from the XOR gate will be Write the Boolean expression for a three-input XOR gate

0- Low

Y=ABC+ABC+ABC+ABC

Table 1: Table of pre-lab answers

2

5.0

PROCEDURES

5.1

PART I



5.1.1 74LS08 GATE EXPERIMENT

Figure 1: 74SL08 Connection

1. Observe Figure 1 (marked 74LS08), plug the IC the digital trainer. Connect the



INPUT “A”, “B” to Data Switch SW1, SW2. Connect the output “Y” to LED display.



2. Change Data Switches SW1, SW2 to turn the LED light on or off (that means the



OUTPUT is “1” or “0”) observe the relationship between input & output, and then



record it in Table 2.



5.1.2 74LS32 GATE EXPERIMENT

Figure 2: 74LS32 Connection

3



1. Observe Figure 2 (marked 74LS32), plug the IC the digital trainer. Connect the



INPUT “A”, “B” to Data Switch SW1, SW2 respectively. Connect the output “Y” to



LED display.



2. Change Data Switches SW1, SW2 from “0” to “1” and back to “0”, then observe



the input and output situations, record them in Table 3.



5.1.3 74LS04 GATE EXPERIMENT

Figure 3: 74LS04 Connection

1. Referring to Figure 3, which is marked 74LS04, plug this IC in the breadboard of



digital trainer.



2. Connect the INPUT “A” to Data Switch SW1, Output “Y” to LED display.

4



5.1.4 74LS00 GATE EXPERIMENT

Figure 4: 74LS00 Connection

1. Observe Figure 4 (marked 74LS00), plug the IC the digital trainer. Connect the



INPUT “A”, “B” to Data Switch SW1, SW2 respectively. Connect the output “Y” to



LED display.



2. Change Data Switches SW1, SW2 to turn the LED light on or off (that means the



OUTPUT is “1” or “0”, observe the relationship between input and output, and then



record it in Table 5.



5.1.5 74LS02 GATE EXPERIMENT



Figure 5:74LS02 Connection 5



1. Observe Figure 5 (marked 74LS02), plug the IC the digital trainer. Connect the



INPUT “A”, “B” to Data Switch SW1, SW2 respectively. Connect the output “Y” to



LED display.



2. Change Data Switches SW1, SW2 from “0” to “1” and back to “0”, then observe



the input and output situations, record them in Table 6.



5.1.6 74LS86 GATE EXPERIMENT



Figure 6: 74LS86 Connection

1. Observe Figure 6 (marked 74LS86), plug the IC the digital trainer. Connect the



INPUT “A”, “B” to Data Switch SW1, SW2 respectively. Connect the output “Y” to



LED display.



2. Change Data Switches SW1, SW2 from “0” to “1” and back to “0”, then observe



the input and output situations, record them in Table 7.

6

5.2 PART II

5.2.1 OR GATE WITH INVERTER INPUTS



Figure 7: OR Gate With Inverter Inputs

Prepare a circuit schematic diagram of the circuit shown in Figure 7. The two inputs, A



and B will connect to toggle switches and the output F will connect to an LED on the



digital trainer.



5.2.2 CASCADED 3-INPUT OR GATES



Figure 8: Cascaded 3-Input OR Gates

Prepare a circuit schematic diagram of the circuit shown in Figure 8. The three input,



A, B and C will connect to toggle switches and output F will connect to an LED on the



digital trainer. Complete the truth table.

7

5.3 PART III

5.3.1 3-INPUT MAJORITY GATE CIRCUIT

Figure 9: 3-Input Majority Gate Circuit

A majority gate is a digital circuit whose output is equal to 1 if the majority of input

are 1’s. The output is 0 otherwise. Prepare a circuit schematic diagram of 3-input majority gate circuit shown in Figure 4a. The three inputs, A, B and C will connect to toggle switches and the output F will connect to an LED on the digital trainer. Complete the truth table. (For Triple NAND Gate refer to appendix.)

6.0 RESULTS 6.1 PART I 6.1.1 74LS08 GATE EXPERIMENT

Figure 10: 74LS08 Gate Experiment 8

Boolean Expression: Y =AB INPUT





OUTPUT

A

B

Y

0

0

0

0

1

0

1

0

0

1

1

1

Table 2: AND Gate Truth Table

6.1.2 74LS32 GATE EXPERIMENT

Figure 11: 74LS32 Gate Experiment Boolean Expression: Y =A+B INPUT

OUTPUT

A

B

Y

0

0

0

0

1

1

1

0

1

1

1

1

Table 3: OR Gate Truth Table

9



6.1.3 74LS04 GATE EXPERIMENT

Figure 12: 74LS04 Gate Experiment Boolean Expression: Y = A INPUT

OUTPUT

A

Y

0

0

0

1

Table 4: NOT Gate Truth Table

6.1.4 74LS00 GATE EXPERIMENT

Figure 13: 74LS00 Gate Experiment

10

Boolean Expression: Y =AB INPUT



OUTPUT

A

B

Y

0

0

1

0

1

1

1

0

1

1

1

0

Table 5: NAND Gate Truth Table

6.1.5 74LS02 GATE EXPERIMENT

Figure 14: 74LS02 Gate Experiment



Boolean Expression: Y =A+B INPUT

OUTPUT

A

B

Y

0

0

1

0

1

0

1

0

0

1

1

0

Table 6: NOR Gate Truth Table

11



6.1.6 74LS86 GATE EXPERIMENT

Figure 15: 74LS86 Gate Experiment Boolean Expression: Y=AB+AB INPUT

OUTPUT

A

B

Y

0

0

0

0

1

1

1

0

1

1

1

0

Table 7: EXCLUSIVE OR Gate Truth Table

12

6.2 PART II

6.2.1 OR GATE WITH INVERTER INPUTS



Figure 16: OR GATE WITH INVERTER INPUTS

INPUT

OUTPUT

A

B

Y

0

0

1

0

1

1

1

0

1

1

1

0

Table 8: Truth table for OR GATE with inverter inputs

13

6.2.2 CASCADED 3-INPUT OR GATES

Figure 17: Cascaded 3-Input OR Gates INPUT

OUTPUT

A

B

C

F

0

0

0

0

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

1

Table 9: Truth table for cascaded 3 -Inputs OR GATE 14

6.3 PART III

6.3.1 3-INPUT MAJORITY GATE CIRCUIT

Figure 18: 3-Input Majority Gate Circuit INPUT

OUTPUT

A

B

C

F

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

1

1

0

0

0

1

0

1

1

1

1

0

1

1

1

1

1

Table 10: Truth Table For 3-Input Majority Gate 15

7.0 TASK (HOMEWORK)

Figure 19 : Task (Homework)

16

7.1

RESULT (HOMEWORK) TRUTH TABLE

LOGIC FUNCTION

INVERTER

AND

AND

A

OUTPUT

0

1

1

0

A B

OUTPUT

0 0

0

0 1

0

1 0

0

1 1

1

A B

OUTPUT

0 0

0

0 1

1

1 0

1

1 1

1

CONNECTION FIGURE

Table 11 :Task Result

17

7.1.2 RESULT (HOMEWORK) LOGIC FUNCTION

NOR

XOR

TRUTH TABLE

A B

OUTPUT

0 0

1

0 1

0

1 0

0

1 1

0

A B

OUTPUT

0 0

0

0 1

1

1 0

1

1 1

0

CONNECTION FIGURE

Table 12 :Task Result

18

8.0 APPENDIX

Figure 19: Triple NAND Gate 74LS10

19