This presentation introduces logic gates. It defines logic gates as electronic switches that take one or more inputs and produce a single output. The presentation describes the basic logic gates - NOT, AND, and OR gates - and their truth tables. It also explains NAND and NOR gates, which are combinations of basic gates. The key information provided is definitions of logic gates, descriptions of common basic logic gates and their operations, and an overview of truth tables and how they represent all possible input-output combinations for a given gate.

1. WELCOME TO MY
PRESENTATION

2. PRESENTATION TOPIC :
LOGIC GATE

3. WHAT ARE LOGICGATES?
• Logic gates are electronic switches with one or
more inputs and one output only.
• Input is data fed into the processor to perform
logical operations.
• The result of the operations is called the output.
• Logic gates operate on a binary input, that is the
input is either 0 or 1.
• The output depends on the input and the type of
logic gate.

4. TRUTHTABLE
• Showsthe result of every possible output given
every possible input.
• The possible number of combinations canbe
determined using the formula N2.
A B
0 0
0 1
1 0
1 1
Truth
Table

5. BASIC LOGIC
GATES
NOT GATE AND GATE OR GATE

6. NOT GATE
• Theoutput is alwaysopposite to the input.Therefore, aNOT
gate isalsocalledaninverter.
• Theinversion by aNOTgate canbe written in the Boolean
algebraic expression:
A X
0 1
1 0
X  A

7. • Theoutput is 1if both inputs are 1.
• The Boolean algebraicexpressionfor the action of anAND
gate is:
AND GATE
X  A B
*Dot signrepresentsANDoperation.
A B X
0 0 0
0 1 0
1 0 0
1 1 1

8. OR GATE
• Theoutput is 1if either oneor both inputs are 1.
• TheBoolean algebraicexpressionfor the action of anOR
gate is:
X  A B
*Plus signrepresentsORoperation.
A B X
0 0 0
0 1 1
1 0 1
1 1 1

9. COMBINATIONS
OF BASIC LOGIC
GATES
NAND GATE NOR GATE

10. NAND GATE
• ANAND gate is equivalent to anAND gate followed by a
NOTgate.
• It is clearthat the output is0 if both inputs give anoutput of
1.In other words, its output is that of anAND gate inverted.
• TheBoolean algebraicexpressionfor this gate:
x  A B
A B X
0 0 1
0 1 1
1 0 1
1 1 0

11. NOR GATE
• ANORgate is equivalentto anORgate folllowed by aNOT
gate.
• It is clear that the output is 1if both inputs are 0n. Other
combinations of inputs give anoutput of 0. In other words,
its output is that of anORgate inverted.
• TheBoolean algebraicexpressionfor this gate:
x  A B
A B X
0 0 1
0 1 0
1 0 0
1 1 0

12. THANK YOU