# Logic Gates

Topics: Logic gate, 4000 series Pages: 3 (392 words) Published: October 23, 2011
EXPT NO.:1STUDY OF LOGIC GATES
DATE:

AIM:
To study about logic gates and verify their truth tables.

APPARATUS REQUIRED:
SL No.| COMPONENT| SPECIFICATION| QTY|
1.| AND GATE| IC 7408| 1|
2.| OR GATE| IC 7432| 1|
3.| NOT GATE| IC 7404| 1|
4.| NAND GATE 2 I/P| IC 7400| 1|
5.| NOR GATE| IC 7402| 1|
6.| X-OR GATE| IC 7486| 1|
7.| NAND GATE 3 I/P| IC 7410| 1|
8.| IC TRAINER KIT| - | 1|
9.| PATCH CORD|  -| 14|

THEORY:

Circuit that takes the logical decision and the process are called logic gates. Each gate has one or more input and only one output. OR, AND and NOT are basic gates. NAND, NOR and X-OR are known as universal gates. Basic gates form these gates.

AND GATE:
The AND gate performs a logical multiplication commonly known as AND function. The output is high when both the inputs are high. The output is low level when any one of the inputs is low.

OR GATE:

The OR gate performs a logical addition commonly known as OR function. The output is high when any one of the inputs is high. The output is low level when both the inputs are low.

NOT GATE:

The NOT gate is called an inverter. The output is high when the input is low. The output is low when the input is high.

NAND GATE:

The NAND gate is a contraction of AND-NOT. The output is high when both inputs are low and any one of the input is low .The output is low level when both inputs are high.

NOR GATE:

The NOR gate is a contraction of OR-NOT. The output is high when both inputs are low. The output is low when one or both inputs are high.

X-OR GATE:

The output is high when any one of the inputs is high. The output is low when both the inputs are low and both the inputs are high.

PROCEDURE:
(i) Connections are given as per circuit diagram.
(ii) Logical inputs are given as per circuit diagram.
(iii) Observe the output and verify the truth table.
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