2-to-4 Line Decoder/Demux

Manufacturer

Part #

Description

Texas Instruments SN74ACT139/SN74ACT139-Q1 Dual 2-to-4 Line Decoders/Demultiplexers contain two 2-to-4 decoders with one active low output strobe (G). When the strobe input is inactive, the outputs are all forced into the high state. These devices are AEC-Q100 qualified for automotive applications.

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Texas Instruments SN74ACT139/SN74ACT139-Q1 2-to-4 Line Decoder/Demux

Introduction

The Texas Instruments SN74ACT139/SN74ACT139-Q1 is a dual 2-to-4 line decoder/demultiplexer designed for efficient data routing and selection in various electronic applications. This component is particularly notable for its automotive qualification, making it suitable for use in demanding environments.

Part Description

The SN74ACT139/SN74ACT139-Q1 features two independent 2-to-4 line decoders, each with an active low output strobe (G). When the strobe input is inactive (G = HIGH), all outputs are set to high. Conversely, when the strobe is active (G = LOW), only the selected output is low while the others remain high. This device operates within a voltage range of 4.5V to 5.5V and is capable of driving outputs up to ±24mA continuously at 5V, with short bursts supporting up to ±75mA. With a fast operation delay of 10.2ns max, it is ideal for high-speed applications.

Applications

Memory device selection with shared data bus
Data routing in digital circuits
Chip-select applications to minimize output requirements

Industries

Automotive
Consumer Electronics
Telecommunications
Industrial Automation

Usage Ideas

Memory Selection Circuit: Use the SN74ACT139 to create a memory selection circuit that allows multiple memory devices to be accessed through a shared data bus, optimizing space and reducing complexity.
Data Routing in Robotics: Implement the decoder in a robotic control system to route signals from various sensors to a microcontroller, ensuring efficient data management and processing.
Chip-Select Logic for Microcontrollers: Design a chip-select logic circuit for a microcontroller to manage multiple peripheral devices, enhancing the overall system performance and reducing pin count.

Conclusion

The Texas Instruments SN74ACT139/SN74ACT139-Q1 2-to-4 Line Decoder/Demux is a versatile and efficient component suitable for a wide range of applications, particularly in automotive and industrial sectors. Its ability to manage data routing and selection makes it an essential part for engineers looking to optimize their designs.