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Decoder

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Pradipta Sarkar
Pradipta Sarkar

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.

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Welcome to our presentation DECODER By Pradipta
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.
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.
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.
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
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
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

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Decoder

  • 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