The document introduces decoders, which are logic circuits that take a binary input and activate only the corresponding output. Decoders have two or more inputs and one or more outputs created by combining logic gates. The number of outputs is equal to 2 to the power of the number of inputs, with each output representing a possible input combination. Decoders break down input combinations to activate only one output at a time, changing two outputs when the input changes. An example is a 1-to-2 line decoder that takes a single bit and decodes it to two data lines based on the input bit value.

1. Welcome to our presentation
DECODER
By Pradipta

2. WHAT IS DECODER ?
A decoder is a logic circuit that accepts a
set of inputs that represents a binary
number and activates only the output the
corresponds to the input number.

3. BASIC OF DECODER
Decoders are circuits with two or more inputs and one or more
outputs, resulting by combining various types of gates. Their basic
function is to accept a binary word (code) as an input and create a
different binary word as an output .
A decoder is a device which does the reverse operation of an encoder,
Lets say we have N inputs to a decoder, the number of outputs will be
equal to 2^N. Thus there will be one line at the output for each
possible input.

4. How can we use them ?
Decoders are simply a collection of
logic gates which are arranged in a
specific way so as to breakdown any
combination of inputs to a set of terms
that are all set to '0' apart from one
term. Therefore when one input
changes, two output terms will change.

5. EXAMPLE
A commo n type o f de co de r is the line
de co de r which take s an n-dig it binary
numbe r and de co de s it into 2 n data
line s. The simple st is the 1 -to -2 line
de co de r. The truth table is
A D1 D0
0 0 1
1 1 0

6. EXAMPLE
A is the addre ss and D is the dataline . D0 is
NOT A and D1 is A. The circuit lo o ks like
A D1
D0

7. EXAMPLE
A is the addre ss and D is the dataline . D0 is
NOT A and D1 is A. The circuit lo o ks like
A D1
D0