MORGAN STATE UNIVERSITY
CLARENCE M. MITCHELL, JR. SCHOOL OF ENGINEERING
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
EEGR 211
Introduction to Digital Logic
Fall 2023
Lab #1: Logic Gates
Submitted on: 09-06-2023
Due date: 09-07-2023
Submitted by Group #1
Darien Winston
Olatomiwa Telufusi
Instructor: Dr. Fahmi Khalifa
Assistant Professor of ECE
Objective
The objective of this lab is to analyze and verify the components of logic gates and to compare the data
gathered from the experiment to the respective truth table of the ‘AND’, ‘OR’, ’NOT’, ‘3-INPUT AND’,
‘NOR’ and ‘NAND’ gates.
Equipment
●
Logic Gates - IC# LS 7400, 7432, 7411, 7404, 7408, 7402
●
Logic Switches
●
Wires
●
BreadBoard or Power Board
●
5V Power supply if using breadboard
●
330Ω or 1.0KΩ resistors
●
LED
●
Multimeter
Introduction
Logic gates are fundamental components of digital circuits in computer and electronic systems. They are
devices that operate on binary inputs (0 and 1) to produce a binary output. In this lab, we would be
analyzing 6 different logic gates: The ‘AND’, ‘OR’, ’NOT’, ‘3-INPUT AND’, ‘NOR’ and ‘NAND’
gates, and comparing our results to their proposed truth tables.
Procedures
●
Identify the first gate and its input and output pins using the IC pinout diagram.
●
Define the inputs and output for the gates ( for this gate, we are using A,B, and C)
●
Voltage values ~5V (greater than or equal to 3.5V) are understood to be the binary value
of 1. Voltage valuesConn ~0V (less than or equal to 0.8V) are understood to be the binary
value of 0.
● Connect your gate to a breadboard or powerboard (we are using breadboard)
● Connect VCC(pin 14 for these gates) to the 5V power supply, and GND (pin 7 for these
gates) to the ground of the power supply.
● Apply the voltages VA and VB using wires and power supply to each input and use a
multimeter to measure its output.
● Measure the output values and record it in a truth table
● Repeat for the rest of the gates
7408 = AND gate
7404= NOT (Inverter) gate
7432=OR gate
7411= 3 inputs AND gate
7400=NAND gate
7402=NOR gate
Design/Theory
AND GATE
A
B
C
0
0
0
0
1
0
1
0
0
1
1
1
B
C
OR GATE
A
0
0
0
0
1
1
1
0
1
1
1
1
NOT GATE
A
B
1
1
0
0
NAND GATE
A
B
C
0
0
1
0
1
1
1
0
1
1
1
0
A
B
C
0
0
0
0
1
0
NOR
1
0
0
1
1
1
3- INPUT AND
A
B
C
D
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
Results
And Gate 7408
A
B
C
0
0
0.12mV
0
1
0.10mV
1
0
0.10mV
1
1
4.985V
3-input AND 7411
A
B
C
D
0
0
0
88.18mV
0
0
1
88.31mV
0
1
0
81.09mV
0
1
1
88.23mV
1
0
0
88.18mV
1
0
1
88.33mV
1
1
0
88.32mV
1
1
1
4.400V
NOT Gate 7404
A
B
0
4.407V
1
160.62mV
NOR gate 7402
A
B
C
0
0
4.984V
0
1
0.00mV
1
0
0.00mV
1
1
0.00mV
A
B
C
0
0
68.04mV
0
1
4.415V
1
0
4.415V
1
1
4.415V
A
B
C
0
0
4.405V
0
1
4.405V
1
0
4.405V
1
1
142.25mV
OR gate 7432
NAND gate 7400
Conclusion
In conclusion, our results verify the operation of the logic gates, AND, NOR, OR, NAND,
3-input AND, and NOT. Our high level output voltage is 3.5V, so any voltage below 3.5V is
considered a “0” and anything above 3.5V is considered a “1”. Therefore, our Truth values are
all correct thus, meeting all lab objectives. Our circuits behaved the way they were indicated and
we did not encounter any problems.