74AC11138N

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Logic - Signal Switches, Multiplexers, Decoders

The 74AC11138N is a 3-to-8 line decoder/demultiplexer tri-state logic device. It incorporates two active-low enable inputs—En1 and En2—which allow for both types of logic functions—decode or demultiplexer.

The 74AC11138N is suitable for use in a wide variety of applications such as decoding data from multiple sources, converting data from serial to parallel, controlling bus access and routing logic for devices such as communications systems and optical networks.

Application Field

The 74AC11138N is a high-speed 3-to-8 line decoder/demultiplexer perfect for applications ranging from clock and data distribution, data converters, and programmable logic devices to bus arbitration and control in computer and telecommunications systems. With its high-speed performance, wide power supply range, and operational temperature range, the 74AC11138N is compatible with common logic families.

The 74AC11138N is particularly well suited to applications which require multiplexing and demultiplexing of data in both serial and parallel form. Common uses include data multiplexing, clock distribution and data routing. Owing to its robustness and flexibility, the 74AC11138N is a great choice for applications where high-speed data decoding and demultiplexing is needed.

Working Principle

The 74AC11138N consists of a 3-to-8 line decoder/demuxer with two active LOW enable inputs—EN1 and EN2. The logic device uses two input logic signals (A and B) to select one of the eight output lines (Y0 to Y7). EN1 and EN2 are active LOW enable inputs and an active LOW output enable (OE) is also provided. The overall device will be disabled when either EN1 or EN2 is LOW regardless of the states of the other inputs. OE must also be LOW for the device to be enabled.

The 74AC11138N operates in either decode mode or demultiplexer mode depending on the polarity of the EN1 and EN2 inputs. In decode mode, the device uses the combination of A and B logic signals to select one of the eight outputs. In demuxer mode, the device uses the combination of A and B signals to activate one of the eight outputs. In both modes, the output signals are either asserted (logic 0) or negated (logic 1) and are controlled by the OE input.

The device can also be configured to operate as a 3-to-2 line decoder or 2-to-8 line multiplexer by hard-wiring one of the inputs to either logic 0 or logic 1. In either of these configurations, the EN1 and EN2 inputs should be tied to the same logic level to enable the device.

The 74AC11138N is a versatile device, allowing for both types of logic functions—decode and demultiplex. With its high-speed performance, wide power supply range, and operational temperature range, the 74AC11138N is compatible with common logic families and is an ideal solution for multiplexing, demultiplexing, and decoding applications.

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