working of decoder circuits?

Question

decoders

Answer 1

decoders are 2X1, 4X2, 8X3, 16X4.. ie they have 2 raised to power m output lines , and m selction inputs .. and 1 input line..
stobe input decides which output line should go high..

consider 8X3 decoder..
it has 1 i/p line 3 selection i/ps( S0,..S2 ) and 8 o/p lines (O0,O1,O2,...O7).

Answer 2

It can detect a code and activate a single output to signal the presence of that code. Decoders have many applications, from producing system alerts in alarm systems to performing the task of driving multiple devices in microprocessor systems (e.g. memory).

Basic Binary Decoder
The function of the binary decoder is to determine if a given input combination has occurred. For example, if we wish to detect that 1011 occurs on the inputs of a digital circuit we must design a decoder which only outputs ‘1’ for this instance.

The Three Bit Binary Decoder:

In order to decode all possible combinations of three bits, eight (23=8) decoding logic gates are required. This type of decoder is called the 3-line-to-8-line decoder because they are 3 inputs and 8 outputs. Let us consider the design of such a decoder and assume that we require ACTIVE HIGH outputs. That is, for a given input combination the decoder outputs ‘1’.

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