The most significant input (A3) produces an useful inhibit function when the ’42’ is used as a 1-of-8 decoder. The A3 input can also be used as the data input in an 8-output demultiplexer application.

A long time ago when a parallel printer port was the standard, i was thinking how to get the most led’s on a 8 bit interface. And came up with a simpel way to demultiplex. It can be used with ...

A clear understanding of Boolean Algebra and/or Electronics is required to get started with implementing a decoder. A decoder is a combinational circuit and so prior knowledge concerning multiplexers, ...