4-bit Binary To Decimal Decoder (bdd)

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) 1

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

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Abstract In this project we designed esigned a 4 bit binary to decimal decoder. A binary to decimal decoder (BDD) is a device which converts the binary (0 (0’s and 1’s)) to its corresponding decimal values. values The logic diagram of a simple 4-bit bit BDD is as shown below:

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Aim:- To design a 4-bit bit binary to decimal decoder using the basic logic gates. Apparatus Required:1. 2. 3. 4. 5. 6. 7.

3 Integrated Circuit (IC) – 7400 (NAND) 5 Integrated Circuit (IC) – 7404 (NOT) 2 Integrated Circuit (IC) – 7432 (OR) 10 Light Emitting Diodes (LEDs) 5V DC Supply Bread boards Connecting Wires

Details of Integrated Circuits: Circuits:•

IC – 7400: It is a 14 pin integrated circuit with four 22-input NAND gates. Pin 14 is at high potential (Vcc) and pin 7 is grounded.

• IC – 7404: It is a 14 pin integrated circuit with six NOT gates. Here also pin 14 is Vcc and pin 7 is 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 22-input OR gates.

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Circuit’s Logic Diagram:-

In the above logic diagram:Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9

A’.B’.C’.D’ A.B’.C’.D’ A’.B.C’.D’ A.B.C’.D’ A’.B’.C.D’ A.B’.C.D’ A’.B.C.D’ A.B.C.D’ A’.B’.C’.D A.B’.C’.D

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Observations:Truth Table: D C B 0 0 0 0 0 0 0 0 1 1

0 0 0 0 1 1 1 1 0 0

0 0 1 1 0 0 1 1 0 0

A

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

0 1 0 1 0 1 0 1 0 1

1 0 0 0 0 0 0 0 0 0

0 1 0 0 0 0 0 0 0 0

0 0 1 0 0 0 0 0 0 0

0 0 0 1 0 0 0 0 0 0

0 0 0 0 1 0 0 0 0 0

0 0 0 0 0 1 0 0 0 0

0 0 0 0 0 0 1 0 0 0

0 0 0 0 0 0 0 1 0 0

0 0 0 0 0 0 0 0 1 0

Q9 Decimal Value 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 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

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