4-bit binary to decimal decoder (bdd)
DESCRIPTION
A semester project report by Harsh Purwar, IISER - Kolkata.TRANSCRIPT
1
Electronics Project Report
Title: 4-bit Binary to Decimal Decoder (BDD)
Indian Institute of Science Education & Research, Kolkata
Semester-II
2008
Project Done By:- Harsh Purwar (76)
Ashish Agarwal (65)
Nethi Vamshidhar (82)
2
INDEX
� Abstract 03
� Aim of the Experiment 04
� Materials Required 04
� Details of ICs 04
� Circuit’s Logic Diagram 05
� Observations (Truth Table) 06
� Precautions 06
� References 06
In this project we designed a 4 bit binary to decimal decoder. A binary to decimal decoder
(BDD) is a device which converts the binary (0
The logic diagram of a simple 4-bit BDD is as shown below:
3
Abstract
esigned a 4 bit binary to decimal decoder. A binary to decimal decoder
(BDD) is a device which converts the binary (0’s and 1’s) to its corresponding decimal values
bit BDD is as shown below:
esigned a 4 bit binary to decimal decoder. A binary to decimal decoder
) to its corresponding decimal values.
Aim:- To design a 4-bit binary to decimal decoder using the basic logic gates.
Apparatus Required:- 1. 3 Integrated Circuit (IC) –
2. 5 Integrated Circuit (IC) –
3. 2 Integrated Circuit (IC) –
4. 10 Light Emitting Diodes (LEDs)
5. 5V DC Supply
6. Bread boards
7. Connecting Wires
Details of Integrated Circuits:
• IC – 7400:
It is a 14 pin integrated circuit with four 2
(Vcc) and pin 7 is grounded.
• IC – 7404:
It is a 14 pin integrated circuit
grounded. Pins 1, 3, 5, 9, 11, 13 are inputs and pins 2, 4, 6, 12, 10, 8 are corresponding
outputs.
• IC – 7432:
It is a 14 pin integrated circuit with four 2
4
bit binary to decimal decoder using the basic logic gates.
– 7400 (NAND)
– 7404 (NOT)
– 7432 (OR)
10 Light Emitting Diodes (LEDs)
Details of Integrated Circuits:-
14 pin integrated circuit with four 2-input NAND gates. Pin 14 is at high potential
) and pin 7 is grounded.
It is a 14 pin integrated circuit with six NOT gates. Here also pin 14 is Vcc
grounded. Pins 1, 3, 5, 9, 11, 13 are inputs and pins 2, 4, 6, 12, 10, 8 are corresponding
It is a 14 pin integrated circuit with four 2-input OR gates.
Pin 14 is at high potential
and pin 7 is
grounded. Pins 1, 3, 5, 9, 11, 13 are inputs and pins 2, 4, 6, 12, 10, 8 are corresponding
5
Circuit’s Logic Diagram:-
In the above logic diagram:-
Q0 A’.B’.C’.D’
Q1 A.B’.C’.D’
Q2 A’.B.C’.D’
Q3 A.B.C’.D’
Q4 A’.B’.C.D’
Q5 A.B’.C.D’
Q6 A’.B.C.D’
Q7 A.B.C.D’
Q8 A’.B’.C’.D
Q9 A.B’.C’.D
6
Observations:-
Truth Table:
D C B A Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Decimal
Value
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
0 0 0 1 0 1 0 0 0 0 0 0 0 0 1
0 0 1 0 0 0 1 0 0 0 0 0 0 0 2
0 0 1 1 0 0 0 1 0 0 0 0 0 0 3
0 1 0 0 0 0 0 0 1 0 0 0 0 0 4
0 1 0 1 0 0 0 0 0 1 0 0 0 0 5
0 1 1 0 0 0 0 0 0 0 1 0 0 0 6
0 1 1 1 0 0 0 0 0 0 0 1 0 0 7
1 0 0 0 0 0 0 0 0 0 0 0 1 0 8
1 0 0 1 0 0 0 0 0 0 0 0 0 1 9
Precautions:- • All the circuit elements (ICs, board, LEDs etc.) should be checked using CRO component
tester and IC tester before using them.
• Switch off the DC supply when not in use to avoid unnecessary wastage of energy.
• Usage of un-insulated wires may lead to short circuiting.
References
• en.wikipedia.org/wiki/Decoders
• www.google.co.in
• www.onsemi.com/pub_link/Collateral/MC14028B-D.PDF
• scitec.uwichill.edu.bb/cmp/online/P10F/decoders.htm
• Digital Computer Electronics – By Albert Paul Malvino