SN74LVC139ANSR

Overview

The SN74LVC139ANSR is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments LVC logic family. It operates within a supply voltage range of 1.65 V to 3.6 V and supports an operating temperature range of -40 °C to +85 °C. The device features active-low enable inputs that can function as data lines in demultiplexing applications. It includes fully buffered inputs capable of accepting voltages up to 5.5 V, allowing compatibility with 3.3-V or 5-V driving circuits. Maximum propagation delay is specified at 6.2 ns.

Feature Summary

• Dual independent 2-to-4 line decoding and demultiplexing functionality within a single package
• Input buffering enables direct interfacing with 3.3-V and 5-V logic systems without level shifting
• Active-low enable pins serve as dedicated control signals or data input lines for demultiplexing
• High ESD protection ratings exceeding JESD 22 standards for robust signal integrity

Applications

• Address decoding for memory and peripheral selection in embedded systems
• Data routing and distribution in mixed-voltage digital environments
• Demultiplexing control signals to multiple downstream logic gates
• Chip select generation for flash memory and storage devices

Procurement Notes

Verify the specific suffix 'NS' corresponds to the SOP (Small Outline Package) variant when sourcing. Confirm RoHS compliance and lead finish specifications against current manufacturer documentation. Ensure the ordering part number matches the required tape and reel quantity if automated assembly is planned. Cross-reference the manufacturing date code to verify production status.

Selection Notes

Select this component when a design requires two separate decoding channels in a compact footprint. The LVC series is appropriate for low-power applications requiring operation below 3.3 V. Verify that the 5.5 V tolerant inputs align with the source driver voltage levels. Consider the SOP package dimensions against available PCB real estate constraints.

Part Context

This device belongs to the SN74LVC139A family of decoders and demultiplexers. The 'ANSR' designation identifies the specific NS package type and reel packaging configuration. It is a standard catalog item designed for general-purpose digital logic applications requiring reliable signal translation between different voltage domains.

Replacement Considerations

SN74LVC139ADBR: Identical logical function housed in an SSOP package.