SN74AHCT138PWG4

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Logic - Signal Switches, Multiplexers, Decoders:

The SN74AHCT138PWG4 is a multi-functional, high performance, low-power 9-bit programmable signal switch designed by Texas Instruments. This component is used to select one or more simultaneous signal paths, decode the signal path, and control the logic level of each signal path. It is suitable for high performance and low power applications such as video signal switching, logic signal switching, multiplexing, demultiplexing and signal timing.

Application Field

The SN74AHCT138PWG4 is widely used from low-speed digital product design to high-speed signal switching applications. With multiple combinational logic, a variety of interface options, and the ability to select from multiple compatible bus pins, this component provides a flexible and cost-effective solution for a variety of applications. Applications for the SN74AHCT138PWG4 include video signal switching, logic signal switching, multiplexing and demultiplexing and signal timing.

Working Principle

The SN74AHCT138PWG4 works by detecting changes on its inputs (A0-A8) and then triggering its eight active-low outputs (B0-B7). Depending on the logic pattern set in the inputs, one or more outputs can be selected. For example, if the inputs A0 and A1 are both set to zero, then the four outputs (B1, B2, B5, and B6) with the active-low level will be enabled. The amount of current that can be driven from the outputs depends on the input voltage used.

The SN74AHCT138PWG4 is also configured to be used as a decoder, which allows it to take multiple inputs and generate an output based on its internal logic. This can be advantageous for determining the inputs to be active, allowing for a more efficient signal selection. The SN74AHCT138PWG4 can also be used as a multiplexer, allowing data from multiple sources to be merged into one output.

In addition to its active-low outputs, the SN74AHCT138PWG4 also has eight active-high outputs (C0–C7). Depending on the logic pattern in the inputs, these outputs can be used to either enable or disable a signal path. The ability of the SN74AHCT138PWG4 to provide both active-low and active-high outputs allows for multiple signals to be combined and amplified without needing additional components.

The SN74AHCT138PWG4 also has an integrated bus-hold circuit which allows it to recognize low to high and high to low bus transitions, and based on its internal logic, select the correct output level. This allows the circuit to remain stable while waiting for the next input change. The integrated pull-up resistors in the SN74AHCT138PWG4 enable communication between components, eliminating the need for additional components like capacitors.

The SN74AHCT138PWG4 is a reliable device which offers strong performance in a wide range of applications. With its combination of multiple inputs, outputs, decoder, multiplexer and bus-hold circuit, it is an ideal device for low-power and high-performance applications.

The specific data is subject to PDF, and the above content is for reference