SN74LV139APW

Overview

The SN74LV139APWR is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments 74LV series, housed in a 16-pin TSSOP package. It operates on a single power supply ranging from 2V to 5.5V and supports mixed-mode voltage operation across all ports. The device incorporates two active-low enable inputs to simplify cascading and data reception functions. Designed for high-speed memory decoders and data-transmission systems, it features fully buffered inputs that represent only one normalized load to the driving circuit.

Feature Summary

• Supports mixed-mode voltage operation on all ports
• Incorporates two enable inputs to simplify cascading and/or data reception
• Ioff circuitry supports partial-power-down mode operation

Applications

• High-speed memory decoding
• Data-transmission systems
• Data-routing applications requiring short propagation delay times

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm production status and material specifications. Ensure the selected variant matches the required lead finish and moisture sensitivity level ratings for the intended assembly process. Cross-reference the part marking requirements with the latest documentation updates to guarantee correct identification during manufacturing.

Selection Notes

Select this component when designing circuits requiring dual independent decoding or demultiplexing within a low-voltage logic family. The device is suitable for applications needing mixed-mode voltage compatibility and simplified cascading through dedicated enable pins. Consider the thermal resistance characteristics of the TSSOP package relative to the expected ambient operating temperature range.

Part Context

This device belongs to the SN74LV139A family of dual 2-line to 4-line decoders/demultiplexers. The 'PW' suffix specifically denotes the 16-pin Thin Shrink Small Outline Package (TSSOP). Other available packages in the same logical family include SOIC, SSOP, TVSOP, SOP, and VQFN configurations, offering flexibility for different board space and thermal management requirements.

Replacement Considerations

SN74LV139ADBR

FAQ

How does the Ioff feature benefit system design?

The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down, which supports partial-power-down applications.

What is the function of the G input?

The G input serves as an active-low output enable for each channel. In demultiplexing applications, these enable inputs can also be utilized as data lines.