SN74ALS139NG4

Overview

The SN74ALS139NG4 is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It belongs to the ALS logic series and features a 16-pin PDIP package with through-hole mounting. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from 0°C to +70°C. Each internal decoder includes an active-low enable input, allowing for independent control of the decoding functions.

Feature Summary

• Contains two independent 2-to-4 line decoders or demultiplexers within a single integrated circuit.
• Features active-low outputs that provide decoded signals corresponding to the binary input states.
• Includes individual active-low enable inputs to selectively activate each decoder section.

Applications

• Address decoding in microprocessor-based systems
• Memory chip select generation
• Control signal distribution in industrial automation

Procurement Notes

Verify the component authenticity by checking the manufacturer marking and date code against official Texas Instruments documentation. Confirm the package type matches the specified 16-pin PDIP configuration. Ensure the ordering suffix aligns with the required specifications. Request the datasheet for detailed electrical characteristics before integration into the design.

Selection Notes

Select this component when a dual decoder solution is required for 5V logic applications. The ALS series offers improved speed and power consumption compared to standard LS logic. Consider the PDIP package for prototyping or applications requiring through-hole assembly. Verify that the active-low output polarity meets the system design requirements.

Part Context

This part is part of the SN74ALS139 family, which provides dual 2-line to 4-line decoding capabilities. The 'G' suffix typically indicates RoHS compliance. It serves as a digital logic component for managing address lines and control signals in electronic circuits requiring multiple decoded outputs from a minimal number of input pins.