multiplexer lecture notes

A multiplexer (abbreviated MUX) is a circuit that directs one of several digital signals to a single output, depending on the states of a few select inputs. We can also say that a multiplexer is a device for switching one of several signals to an output under the control of another set of binary inputs.
The inputs to be switched are called the data inputs.
The inputs that determine which signal is directed to the output are called select inputs.

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  1. guru

    Digital multiplexers are integrated circuits (ICs) that route digital information from multiple sources onto a single line for transmission to a common destination. They maximize the efficiency of communication systems and data networks by combining multiple audio, voice, and data applications onto a single subcarrier. This limits interference and allows signals to share modulators and demodulators. Time division places signals onto a shared line at the correct time. Digital multiplexers accept binary numbers as selector inputs and present the logic level connected to the input line as the output from the data selector. Multi-channel inputs and three-state buffered outputs are available. Devices with two inputs can multiplex up to four data signals. With three addressing inputs, digital multiplexers can handle up to eight signals.

    Selecting digital multiplexers requires an analysis of performance specifications and features. Devices differ in terms of the number of inputs, operating current, operating temperature, and minimum supply voltage required for active chip operation. Digital multiplexers also differ by propagation delay, the time interval between the application of an input signal and the occurrence of the corresponding output. Open-collectors have an output signal, provided by a transistor, which acts like a switch closure to ground when activated. Open-drain collectors require a pull-up resistor, use complementary metal oxide semiconductor (CMOS) technology, and represent a counterpart to transistor-transistor logic (TTL). Digital multiplexers with complementary outputs have both a true output and a complement. Output enabled (OE) devices have an enable pin for the output.