4-bit binary to decimal decoder (bdd)

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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)

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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:

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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


It is a 14 pin integrated circuit with four 2-input OR gates.

Pin 14 is at high potential

and pin 7 is


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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

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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

4-bit binary to decimal decoder (bdd)

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