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BCD to 7-segment display using IC 7490 and IC 7447

Gujarat Technological University

Prepared By:Sanchela Maulik M. :- 14EC038

Bhatt Abhay N. :- 14EC022B. E. (E. & C.)3rd Sem.

BHGCET, Rajkot

Internal Guide:Prof. Manish P. PatelAssistant ProfessorE & C Dept. BHGCET, Rajkot

Presentation of Active Learning Assignment

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Outline:

Introduction Component List Pin Diagrams and Descriptions Circuit Diagram and Description Practical circuit References

Introduction:In our project, using IC7447 and IC7490

we can convert the BCD to 7 segment.This project is used in displays, entry

counters, etc.When we apply 1 clock pulse at that time

IC7490 generates 4bit BCD code, and it’s given to IC7447, and finally its displays in & 7-segment display.

Component list:

7 segment driver IC 7447Decade counter IC 74907 segment led display common anodeResistor 330 Ω

0 to 9 Binary Input Sequence Code:

Pin Diagrams & Description:

Pin Diagram of IC 7490:

Pin Description of IC7490:Pin No Function Name

1 Clock input 2 Input22 Reset1 R(0)13 Reset2 R(0)24 Not connected NC5 Supply voltage; 5V (4.75V – 5.25V) Vcc6 Reset3 R(9)37 Reset4 R(9)48 Output 3, BCD Output bit 2

QC

9Output 2, BCD Output bit 1

QB

10 Ground (0V) Ground11 Output 4, BCD Output bit 3

QD

12 Output 1, BCD Output bit 0 QA

13 Not connected NC14 Clock input 1 Input1

Pin Diagram of IC 7447:

Pin Description of Ic7447:Pin No Function Name

1 BCD Input 2 B2 BCD Input 3 C3 Display test; Active low LT4 Ripple blanking output; Active low RBO5 Ripple blanking input; Active low RBI6 BCD Input 4 D7 BCD Input 1 A8 Ground (0V) Ground9

Segment outputs; Active low

e10 d11 c12 b13 a14 g15 f16 Supply voltage; 5V (4.75V – 5.25V) Vcc

Pin Diagram of 7- segment common anode display:

Types of 7-segment Display:

Connection of 7447 with 7- segment:

Pin Description of 7- segment Display:

Function of 7 segment:

Circuit Diagram:

Circuit Diagram Description: Pins R0(1), R0(2), R9(1), R9(2) connected to

ground. Pins Q0, Q1, Q2, Q3 connected to the output

logic indicator pins of input IC7447 at A, B, C, D.

Clk B pin connected to Q0. Clk A pin connected to push button for the

input signal ground. Output pins of IC7447 Qa, Qb, Qc, Qd, Qe, Qf,

Qg connected to the 7- Segment Display. Apply 5 v Vcc Supply to the 7- Segment Display

and IC7447 & IC7490.

Practical Circuit:

References:www.davidswinscoe.com/electron

ics/componentswww.engineersgarage.comwww.electroschmetics.comwww.mouser.in/embedded-solutio

ns/www.electronics-tutorials.ws/

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Thank You