SN74LV139ANSR

Overview

The SN74LV139ANSR is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments SN74LV139A series. 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, while Ioff circuitry enables partial-power-down mode by preventing damaging backflow current when powered down. Designed for high-speed memory decoders and data-transmission systems, it features latch-up performance exceeding 250mA per JESD 17 standards.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the ordering suffix 'NSR' corresponds to the SOP (NS) package with tape-and-reel carrier containing 2000 units per reel. Confirm RoHS compliance status and lead finish specifications via the latest TI Package Option Addendum before procurement. Ensure the component meets the required operating temperature range of -40°C to 85°C for the intended application environment.

Selection Notes

Select this component for designs requiring dual independent decoding channels within a single 16-pin package. The LV logic family provides compatibility with 2V to 5.5V supply rails, making it suitable for mixed-voltage environments. Consider the maximum propagation delay characteristics at the specific operating voltage to ensure timing requirements are met in high-performance memory or data routing applications.

Part Context

This part belongs to the SN74LV139A family of dual 2-line to 4-line decoders/demultiplexers. The 'SN74' prefix indicates commercial grade availability, while 'LV' designates the low-voltage CMOS technology optimized for high-speed operation. The 'A' suffix typically denotes an enhanced revision of the base model. The 'NSR' suffix specifically identifies the Small Outline Package (SOP) variant supplied in a tape-and-reel format for automated assembly.

Replacement Considerations

Direct replacements include other SN74LV139A variants with different packages such as SN74LV139APWR (TSSOP) or SN74LV139ADR (SOIC), provided pinout compatibility is verified. Cross-manufacturer equivalents like MC74LCX139DTR2G may be considered but require careful evaluation of voltage levels and electrical characteristics.