Introduction and Explanation of Basic Gates
The subject deals with a vast number of gates and let us know some of them
Most of the gates have two(2) inputs and one(1) output. Secondly, inputs for all gates are binary. And Thirdly, each gate has its own boolean expression and these gates are fabricated into DIPs (Dual Inline Packages) and having IC numbers. And to test or work on these IC's we need a digital logic trainer kit.
Basic Gates:
- AND Gate
- OR Gate
- NOT Gate
- NAND Gate
- NOR Gate
- EX-OR Gate
- EX-NOR Gate
So now get into detailed info about each gate
Basic Gates:
1. AND Gate: An AND gate output is high if all the inputs are high.
- The fabricated IC number is 7408 and in this IC there are 4 AND gates.
- It is 14 pins where 7 are one side and the other 7 are at another.
- It costs around 20/-.
Boolean Expression: Q = A.B
Logic Symbol:
Logic Diagram:
Truth Table:
Truth Table:
|
A (I/p)
|
B (I/p)
|
Q (o/p)
|
|
0
|
0
|
0
|
|
0
|
1
|
0
|
|
1
|
0
|
0
|
|
1
|
1
|
1
|
- OR gate has two or more inputs but here we discuss only two inputs.
- The fabricated IC number is 7432 and in this, there are 4 OR gates.
- It costs around 20/-.
Boolean Expression: Q = A+B
Logic Symbol:
Truth Table:
|
A (I/p)
|
B (I/p)
|
Q (o/p)
|
|
0
|
0
|
0
|
|
0
|
1
|
1
|
|
1
|
0
|
1
|
|
1
|
1
|
1
|
3.NOT Gate: NOT gate is a single input gate whose output is always opposite to the input.
- The fabricated IC number is 7404.
- There are 6 NOT gates in the IC 7404.
- It costs around 30/-.
Boolean Expression: Q = A
Logic Symbol:
Logic Diagram:
Truth Table:
|
A (I/p)
|
Q (o/p)
|
|
0
|
1
|
|
1
|
0
|
To purchase those IC's you can go through the following links
...Thank you for reading...
Image Credits @wikipedia
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