Decoder

A decoder is a type of digital circuit that converts the language of machine-readable language into user understandable language.  Decoder  ...

A decoder is a type of digital circuit that converts the language of machine-readable language into user understandable language. 

Decoder 

It gets a set of inputs that represent a binary number and activates output corresponding to the binary number. It plays the inverse role of an encoder.
In a decoder, we have to give n input line and from this, we will get a 2n output line.

3 to 8 Line Decoder

In every situation in this table, we see only a single output 1 and others are 0. For 3 line input, we get 8 line output. From 3 to 8 line decoder we get an octal number from a binary number.

Know about the encoders in Digital Electronics. 

Decoder table 

Input			Output
A	B	C	D₀	D₁	D₂	D₃	D₄	D₅	D₆	D₇
0	0	0	1	0	0	0	0	0	0	0
0	0	1	0	1	0	0	0	0	0	0
0	1	0	0	0	1	0	0	0	0	0
0	1	1	0	0	0	1	0	0	0	0
1	0	0	0	0	0	0	1	0	0	0
1	0	1	0	0	0	0	0	1	0	0
1	1	0	0	0	0	0	0	0	1	0
1	1	1	0	0	0	0	0	0	0	1

We get 8 equations,

D₀ =ĀB̄C̄ 
D₁ =ĀB̄C
D₂ =ĀBC̄
D₃ =ĀBC
D₄ =AB̄C̄
D₅ =AB̄C
D₆ =ABC̄
D₇ =ABC

3 to 8 line decoder block diagram

 

3 to 8 line decoder circuit diagram

Decoder applications

The decoder converts the machine language into human-understandable language. Such as,

• Binary to decimal
• BCD code to a decimal number
• Complex written code to normal language 
• The decoder used in output devices. Such as the computer monitor