Decoder:
A decoder is a
multi-input multi-output logic circuit, which convert coded input to coded
output, where input and output codes are different.
The encoded
information is presented as n input producing 2*n possible output.
The 2*n output
values are from 0 through 2*n – 1.
Binary encoder:
A decoder which
has an n-bit binary input code and a one activated output out of 2*n output
code is called binary decoder.
|
INPUT |
OUTPUT |
|||||
|
EN |
A |
B |
Y3 |
Y2 |
Y1 |
Y0 |
|
0 |
X |
X |
0 |
0 |
0 |
0 |
|
1 |
0 |
0 |
0 |
0 |
0 |
1 |
|
1 |
0 |
1 |
0 |
0 |
1 |
0 |
|
1 |
1 |
0 |
0 |
1 |
0 |
0 |
Draw the circuit
for 3 to 8 decoder?
|
INPUT |
OUTPUT |
||||||||||
|
EN |
A |
B |
C |
Y7 |
Y6 |
Y5 |
Y4 |
Y3 |
Y2 |
Y1 |
Y0 |
|
0 |
X |
X |
X |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
|
1 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
|
1 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
|
1 |
0 |
1 |
1 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
|
1 |
1 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
|
1 |
1 |
0 |
1 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1 |
1 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Design and
implement a full adder circuit using a 3:8 decoder?
Application of
Decoder:
Code
converters
Implementation
of combinational logic circuit
Adderess
decoding
BCD
to 7-segment decoder
Decoder IC’s:
|
IC Number |
Function |
|
74138 |
3:8 Decoder |
|
74139 |
Duel 2:4 Decoder |
|
7442 |
BCD to decimal |
|
7447 |
BCD to 7- segment |
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