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74AC11138PW Application Field and Working Principle

Logic - Signal Switches, Multiplexers, Decoders

The 74AC11138PW is a high-speed CMOS analog multiplexer which integrates eight independent triple 2-input multiplexers in a single chip. The multiplexers have a total of 10 select inputs providing 1024 independent control codes. Additional features of the part include wide logic levels - up to 6 volts on S1 and S2, a total of 31 logic inputs, 4 output logic levels configurable from TTL to 5 volts, and an exceptionally fast response time of 9ns typical. It is manufactured using Texas Instruments\' advanced silicon-gate CMOS process for optimal speed and power savings.

The 74AC11138PW is suitable for many analog switching configurations. Due to its high speed and low power consumption, it can be used to handle inputs ranging from AC to DC. With its 1024 different select codes, it is able to perform multiplexing and demultiplexing functions quickly and with great accuracy. Further, the device is capable of driving up to 31 discrete logic inputs, making the device ideal for a variety of switching, multiplexing and decoding applications.

The 74AC11138PW utilizes a 5-wire control logic input which allows for a single-set configuration of all the control logic parameters. This control logic input consists of two select lines, S1 and S2, together with an enable (EN) input. The inputs are connected to an on-chip programmable selection array to create the desired configuration.

The S1 and S2 inputs are used to set the Address Selection (AS) of the device. When these inputs are driven with logic level high and low respectively, the AS defaults to an address of ‘0000’. When the Enable input is brought low, the device begins operating and will select one or more of the 512 data points as specified by the AS function, and output it on the selected output channel.

Other features of the 74AC11138PW include onboard hysteresis and programmable output levels which can be adjusted to the full range of TTL, LS TTL to LVTTL, and 5V output levels. The device also offers both static and short-term protection against +25V and -25V mismatches and is specified at up to 4MHz clock frequencies with a low 4nA static current draw.

This multiplexer can be used for many applications, ranging from switching and multiplexing to decoding and data transmission. It is widely used in telecommunications systems and in control systems for sensing and controlling environment variables such as pressure, temperature and humidity. In addition, the device is used in data acquisition systems, motion control systems and other process control systems.

In summary, the 74AC11138PW is an extremely versatile multiplexer capable of providing high-speed, low-power operation and a wide range of logic functions. Its extended address lines, programmable logic levels and flexible control logic make it suitable for all types of logic switching, multiplexing, data acquisition and decoding applications.

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