The variables are connected to the selector inputs, and the function result, 0 or 1, for each possible combination of selector inputs is connected to the corresponding data input. Any Boolean function of n variables and one result can be implemented with a multiplexer with n selector inputs. Multiplexers can also be used as programmable logic devices, to implement Boolean functions. This allows the roles of input and output to be swapped, so that a bi-directional multiplexer can function both as a demultiplexer and multiplexer. Output is open collector and same as inputīi-directional multiplexers are built using analog switches or transmission gates controlled by the select pins. List of ICs which provide demultiplexing Fairchild 74F138 1:8 demultiplexer List of ICs which provide multiplexing Signetics S54S157 quad 2:1 muxįor 7400 series part numbers in the following table, "x" is the logic family.īoth outputs available (i.e., complementary outputs) The two 4-to-1 multiplexer outputs are fed into the 2-to-1 with the selector pins on the 4-to-1's put in parallel giving a total number of selector inputs to 3, which is equivalent to an 8-to-1. For example, an 8-to-1 multiplexer can be made with two 4-to-1 and one 2-to-1 multiplexers. Larger Multiplexers can be constructed by using smaller multiplexers by chaining them together. A multiplexer of 2 n inputs indicate the decimal value of the binary control inputs at which that input is let through. The selection is directed by a separate set of digital inputs known as select lines. In electronics, a multiplexer (or mux spelled sometimes as multiplexor), also known as a data selector, is a device that selects between several analog or digital input signals and forwards the selected input to a single output line. Like a multiplexer, it can be equated to a controlled switch. It can be equated to a controlled switch. For telecommunications, see multiplexing. This article is about electronics switching.
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