Multiplexers

Single chip logic networks can be classified into four types. They are small-scale integrated circuits, medium-scale integrated circuits, large-scale integrated circuits and very-large-scale integrated circuits. Multiplexer is a medium scale integrated circuit (MSI) device. They are also known as data selectors. Multiplexer selects one of its data input lines and place the corresponding information appearing on this line to a single output line. It requires n bits to specify selected input line. This can be accomplished by placing the binary code for a desired data input line onto its n select input lines. Provisions for enable, strobe and line are included just similar to that in decoders to provide superior flexibility. Here each data input line goes to its own AND-gates. When enabled, output corresponds to the value on the data input line of the selected AND-gate. Multiplexing is the process of transmission of information from several sources over a single path. A multiplexer-demultiplexer combination can be used to transfer information from several source locations to several destination locations. Multipleexers can also be used as general logic-design devices for the easy and simple realization of Boolean functions.