Digital Electronics Fundamentals: Logic gate

CHAPTER 3
LOGIC GATES

DFV10133
DIGITAL
ELECTRONICS
FUNDAMENTALS

PRESENTED BY:
SITI ZALEHA BT ABD AZIZ

CONTENT

Learning Introduction Logic Test1 Q&A
Outcome To Test2
Gates Test3
Logic Quiz
1. Symbol
Gates 2. LO
3. TT
4. BE

LEARNING OUTCOMES

After Completing The Unit, Students Should Be
Able To:

1. Identify the gates by its distinctive shape
symbol
2. Describe the gate logical operation
3. Generate the truth table for the gate
with any number of inputs.

LOGIC GATES

WHY WE
NEED
LOGIC
GATE?

HISTORY OF LOGIC GATES



LOGIC GATES

1. Logic gates are the basic
building blocks to form an

electronics circuit.

LOGIC GATES

2. Logic gate has one or more
input terminal & one output

terminal.

LOGIC GATES

3. The output will be HIGH(1) or
LOW(0) depends on the input
terminal.

LOGIC GATES

4. There are 7 main logic
gates which are:

a. NOT Gate
b. OR Gate
c. AND Gate
d. NAND Gate
e. NOR Gate
f. EX-OR Gate
g. EX-NOR Gate

LOGIC GATES

The NOT gate perform the

NOT operation called inversion. Also
gate called as an inverter

1)Symbol
2)Logic operation

A X=A’ If the input is 1, the output is 0

If the input is 0, the output is 1

3)Truth table

IC A X=A’ X=A’
74LS04 01
10
7404
4)Boolean expresion

HOW TO SEACRH ON INTERNET FOR
IC DATASHEET 74LS04

LOGIC GATES 1)Symbol
2)Logic operation
AND
gate If both inputs are 1, the output is 1

A Y=A*B If any input is 0, the output is 0
B
3)Truth table
IC A B Y=A*B
7408 000
7411 010
7421 100
111

4)Boolean expresion

Y=A*B

LOGIC GATES

OR 1) Symbol
gate 2)Logic operation

A Y=A+B If any input is 1, the output is 1
B
3) If all inputs are 0, the output is 0
IC Truth table
7432
A B Y=A+B
000
011
101
111

4)Boolean expresion

Y=A+B

LOGIC GATES

NAND 1) Symbol
gate 2)Logic operation

A If both inputs are 1, the output is 0
B
3) Any input is 0, the output is 1
IC Truth table
7400
7410 A B Y=(A*B)’
7420 001
011
101
110

4)Boolean expresion

LOGIC GATES 1)Symbol
2)Logic operation
NOR
gate If both inputs are 0, the output is 1

If any input is 1, the output is 0
A

3)B Truth table

A B Y=(A+B)’
001
010
100

4) 1 1 0
Boolean expresion

IC
7402

LOGIC GATES 1)Symbol
2)Logic operation
EX-OR
gate Both inputs are different, the output is 1

Both input is same, the output is 0

3)A Truth table

B ABY
000
011
101

4) 1 1 0
Boolean expresion

IC
7486

LOGIC GATES 1)Symbol
2)Logic operation
EX-NOR
gate Both inputs are different, the output is 0

Both input is same, the output is 1

3)A Truth table

B ABY
001
010
100

4) 1 1 1
Boolean expresion

IC
74226

LOGIC GATES Identify the gates below:

TEST 1

EX-NOR NOT

EX-OR AND

NAND NOR

LOGIC GATES

TEST 2 Describe the logic operation
for gates below:

If the input is 1, the output is 0
If the input is 0, the output is 1

If both inputs are 1, the output is 1
If any input is 0, the output is 0

Both inputs are 1, the output is 0
Any input is 0, the output is 1

LOGIC GATES

TEST 3 Generate the truth table for
these gate

A B Y=A*B

000

010

100

111

LOGIC GATES

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d2da4d07d4fc001b237924/start

?studentShare=true

LOGIC GATES

After completing the unit,
students ALREADY be able to:

✓1. Identify the gates by its
distinctive shape symbol

✓2. Describe the gate logical
operation

✓3. Generate the truth table
for the gate with any
number of inputs.

THE END

THANK YOU FOR YOUR
ATTENTION

Question & Answer
Q&A