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Monday, April 4, 2011

STUDY OF BASIC DIGITAL ICS


STUDY OF BASIC DIGITAL ICS



AIM:

To verify the truth table of basic digital ICs of AND, OR, NOT, NAND, NOR, EX-OR gates.

APPARATUS REQUIRED:

S.No
Name of the Apparatus
Range
Quantity
1.
Digital IC trainer kit

1
2.
AND gate
IC 7408
1
3.
OR gate
IC 7432
1
4.
NOT gate
IC 7404
1
5.
NAND gate
IC 7400
1
6.
NOR gate
IC 7402
1
7.
EX-OR gate
IC 7486
1
8.
Connecting wires
As required



THEORY:

  1. AND gate:

An AND gate is the physical realization of logical multiplication operation.  It is an electronic circuit which generates an output signal of ‘1’ only if all the input signals are ‘1’.

  1. OR gate:

An OR gate is the physical realization of the logical addition operation.  It is an electronic circuit which generates an output signal of ‘1’ if any of the input signal is ‘1’.

  1. NOT gate:

A NOT gate is the physical realization of the complementation operation.  It is an electronic circuit which generates an output signal which is the reverse of the input signal.  A NOT gate is also known as an inverter because it inverts the input.

  1. NAND gate:

A NAND gate is a complemented AND gate.  The output of the NAND gate will be ‘0’ if all the input signals are ‘1’ and will be ‘1’ if any one of the input signal is ‘0’.

  1. NOR gate:

A NOR gate is a complemented OR gate.  The output of the OR gate will be ‘1’ if all the inputs are ‘0’ and will be ‘0’ if any one of the input signal is ‘1’.

  1. EX-OR gate:

An Ex-OR gate performs the following Boolean function,
           
A  B = ( A . B’ ) + ( A’ . B )

It is similar to OR gate but excludes the combination of both A and B being equal to one.  The exclusive OR is  a function that give an output signal ‘0’ when the two input signals are equal either ‘0’ or ‘1’.


PROCEDURE:

1.  Connections are given as per the circuit diagram
  1. For all the ICs 7th  pin is grounded and 14th pin is given +5 V supply.
  2. Apply the inputs and verify the truth table for all gates.



AND GATE

LOGIC DIAGRAM:


PIN DIAGRAM OF IC 7408 :



CIRCUIT DIAGRAM:


TRUTH TABLE:

S.No
INPUT
OUTPUT
A
B
Y = A . B
1.
0
0
0
2.
0
1
0
3.
1
0
0
4.
1
1
1





OR  GATE

LOGIC DIAGRAM:



PIN DIAGRAM OF IC 7432 :



CIRCUIT DIAGRAM:


TRUTH TABLE:


S.No
INPUT
OUTPUT
A
B
Y = A + B
1.
0
0
0
2.
0
1
1
3.
1
0
1
4.
1
1
1




NOT GATE


LOGIC DIAGRAM:


PIN DIAGRAM OF IC 7404 :



CIRCUIT DIAGRAM:



TRUTH TABLE:

S.No
INPUT
OUTPUT
A
Y = A’
1.
0
1
2.
1
0






NAND GATE

LOGIC DIAGRAM:


PIN DIAGRAM OF IC 7400 :



CIRCUIT DIARAM:



TRUTH TABLE:


S.No
INPUT
OUTPUT
A
B
Y = (A. B)’
1.
0
0
1
2.
0
1
1
3.
1
0
1
4.
1
1
0


NOR GATE

LOGIC DIAGRAM:


PIN DIAGRAM OF IC 7402 :




CIRCUIT DIAGRAM:


TRUTH TABLE:


S.No
INPUT
OUTPUT
A
B
Y = (A + B)’
1.
0
0
1
2.
0
1
0
3.
1
0
0
4.
1
1
0



EX-OR GATE

LOGIC DIAGRAM



PIN DIAGRAM OF IC 7486:



CIRCUIT DIAGRAM:


TRUTH TABLE:

S.No
INPUT
OUTPUT
A
B
Y = A  B
1.
0
0
0
2.
0
1
1
3.
1
0
1
4.
1
1
0





RESULT:

The truth table of all the basic digital ICs were verified.

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