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







Related Discussions:- How 74147 series ttl can be used as a decimal-to-bcd encoder, Assignment Help, Ask Question on How 74147 series ttl can be used as a decimal-to-bcd encoder, Get Answer, Expert's Help, How 74147 series ttl can be used as a decimal-to-bcd encoder Discussions

Write discussion on How 74147 series ttl can be used as a decimal-to-bcd encoder
Your posts are moderated
Related Questions

Resolution Method - Artificial intelligence: A minor miracle happened in 1965 when Alan Robinson published his resolution function. This function uses a generalized format of t

How physical addressing is performed in WAN? WAN networks operate as similar to a LAN. All WAN technology classifies the exact frame format a computer uses while sending and re

Q.What is Canonical and Standard Forms? An algebraic expression can express in two forms: i) Sum of Products   (SOP) for example (A . B¯) + (A¯ . B¯)            ii) Produ

Binary Constraints: Alternatively unary constraints specify that a particular variable can take certain values that basically restricts the domain for that variable thus shoul

How many Flip-Flops are required for mod-16 counter? Ans. 4 flip-flops is required for Mod-16 Counter. For Mod-m Counter, we require N flip-flops where N is selected to be the

Q. Calculate Print Speed of printers? Speed at which a printer prints is generally an important issue. Though the printer has to take a certain time to print. Printing time ris

Explain two dimensional array In two dimensional arrays, array is a pointer-to-pointer-to-data type.: at the first level, it points to a block of pointers, one for each row. Th

Explain about the term Middleware. Middleware is the term frequently used to explain the application or business logic present within an application server. Unfortunately, simi

Common toes deformities are: 1. Hallux valgus: Deviation of great toe towards the second toe resulting in prominence of first metatarsal head.  Later on there is formation of