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I've gone through the decoder truth table and able to understand that. but i want to know why the corresponding output values related to input values get 1.

Example if we consider 2 to 4 Decoder when inputs are 1 1 then the output will be 1 0 0 0 the 4th place will get 1.

I need a reason why this is happening ?

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Theivendram Athavan
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  • Because that's how it was built? A look at a circuit diagram will tell you why this is happening at the technical level--I'm not sure I understand the question. (Noting that a decoder could be built to decode two inputs however we wanted to decode them.) – Dave Newton Jun 27 '19 at 01:45

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A line decoder is designed to turn code(encoded boolean values) into mutually-exclusive signals (only one of the outputs can be 1) as you can see from the decoder truth table. A schema and circuitry for the decoder is implemented using this truth table because that is the behavior we are trying to create in our circuitry.

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