Demultiplexer or decoders are devices that have the function desired output selection is adjusted to a predetermined input. At the decoder if input as an example of three input a1, a2 and a3, then the output will be produced 2 ^ 3 = 8 output (b1, b2, b3, b4, b5, b6, b7 and B8).
In the picture below shows an example in the specification demultiplexer using TTL IC 74HC237
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