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Tags: Encoder

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2:4 Decoder ( Binary Decoder)

For a decoder, If the input is a N bit binary number, then the output will be one the lines of the 2^N output lines.

So, for a 2-bit binary input, there will be 2^2 output lines and only one of the output lines will be active according to the binary combination of the inputs. This type of decoder is known as 2 to 4 decoder.

A

B

 

Q0

Q1

Q2

Q4

0

0

 

1

0

0

0

0

1

 

0

1

0

0

1

0

 

0

0

1

 

1

1

 

0

0

0

1


project.name
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8:1 Multiplexer

Consider a 8:1 multiplexer that takes 8 two-bit inputs (T8 to T1), three-bit control signal (S) and has an output (Out). This Type of multiplexer is known as a 8 to 1 multiplexer. The truth table is given below:

S2

S1

S0

OUT

0

0

0

T1

0

0

1

T2

0

1

0

T3

0

1

1

T4

1

0

0

T5

1

0

1

T6

1

1

0

T7

1

1

1

T8


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Decoder:-

A decoder is a combinational circuit. It has n input and to a maximum m = 2n outputs. Decoder is identical to a demultiplexer without any data input. It performs operations which are exactly opposite to those of an encoder.

Block diagram:-

Truth table:-



Diagram:-

*formed using simulator.

Encoder:-

Encoder is a combinational circuit which is designed to perform the inverse operation of the decoder. An encoder has n number of input lines and m number of output lines. An encoder produces an m bit binary code corresponding to the digital input number. The encoder accepts an n input digital word and converts it into an m bit another digital word.

Block diagram:-

Truth table:-

Diagram:-


*formed using simulator.




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Ashwani kumar


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Encoder, Decoder, Convertor, Full Adder using Decoder


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Realization of 4:2 bit Encoder Circuit using Basic Logic Gates