How 74147 series ttl can be used as a decimal-to-bcd encoder, Computer Engineering

Illustrate how 74147 series TTL can be used as a decimal-to-BCD encoder.

Ans. Available IC in 74 series is 74147 that is a priority encoder. Such IC has active low inputs and outputs. The significance of the word priority can be realized from the truth table. For example if 2 and 5 are low, the output will be consequent to 5 that has a higher priority than 2 that is the highest numbered input has priority over lower numbered inputs.

While an exact number is to be fed to the digital circuit in BCD code, then the switch consequent to which number is pressed.

Truth table of 74147

Active low decimal input's                                                           Active low BCD

outputs

1

2

3

4

5

6

7

8

9

D

C

B

A

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

0

X

0

1

1

1

1

1

1

1

1

1

0

1

X

X

0

1

1

1

1

1

1

1

1

0

0

X

X

X

0

1

1

1

1

1

1

0

1

1

X

X

X

X

0

1

1

1

1

1

0

1

0

X

X

X

X

1

0

1

1

1

1

0

0

1

X

X

X

X

1

1

0

1

1

1

0

0

0

X

X

X

X

X

X

X

0

1

0

1

1

1

X

X

X

X

X

X

X

X

0

0

1

1

0

 

1372_74147 series TTL used as a decimal-to-BCD encoder.png

74147 series TTL used as a decimal-to-BCD encoder

Posted Date: 5/4/2013 5:52:52 AM | Location : United States






Your posts are moderated
Related Questions
What is a Multiplexer Tree? Ans Multiplexer Tree: The largest available MUX IC is 16 to 1. Meeting the larger input requires there must be a provision to expand this. It

Production-Centered Virtual Manufacturing It utilizes simulation ability to manufacturing process models along with the purpose of permitting inexpensive, fast evaluation of va

Q. Define Stack segment ? 8086 Microprocessor supports Word stack. Stack segment parameters tell the assembler to alert linker that this segment statement states the program s

Any system able of run Gnome 2, KDE 3.2, Windows 2000, Mac OS X and later versions should be capable to run GIMP. GIMP's biggest appetite is for memory and how much you will requir

Question: Logical User-Centered Interactive Design Methodology is a methodology that identifies six clear stages to help in software development while keeping the user in mind.

What are the risks involved in Electronic Payment Systems?    From the customer's perspective: Dishonest merchants or financial service providers Stolen payment

You insert rendezvous points into Vuser scripts to imitate heavy user load on the server. Rendezvous points instruct Vusers to wait during test implementation for multiple Vusers t

Q. What is Data link layer? Data link layer: data link layer is responsible for transmitting a group of bits between adjacent nodes. Group of bits is termed as frame. Network

What is the functionality of Remote Login? Remote Login gives similar functionality of telnet, along with the added functionality of not involving a password from trusted cli

Define a Gate Fix ASIC-based design in short. Gate Fix ASIC-based design: A Gate Fix implies that a select number of gates and their interconnections may be subtracted or ad