SN74LVC139ADRG4

Overview

The SN74LVC139ADRG4 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 fully buffered inputs that accept voltages up to 5.5 V, enabling compatibility with 3.3-V or 5-V driving circuits. It provides a maximum propagation delay of 6.2 ns at 3.3 V and includes ESD protection exceeding 2000 V per the human-body model.

Feature Summary

• Dual independent 2-line to 4-line decoding and demultiplexing functions
• Fully buffered inputs compatible with 3.3-V and 5-V logic levels
• Active-low enable inputs functioning as data lines for demultiplexing
• Latch-up performance exceeding 250 mA per JESD 17 standards

Applications

• Address decoding in memory architectures
• Demultiplexing control signals in mixed-voltage systems
• Selecting peripheral devices in embedded controllers
• Logic translation between 3.3-V and 5-V domains

Procurement Notes

Verify the specific ordering suffix 'RGY' corresponds to the VQFN package variant when sourcing. Confirm RoHS compliance and lead finish specifications against current manufacturer documentation. Ensure the active-low enable polarity matches system design requirements. Validate thermal pad soldering guidelines for the selected package type during assembly planning.

Selection Notes

Choose this component for applications requiring low-voltage operation down to 1.65 V with high-speed decoding capabilities. The 5.5 V tolerant inputs simplify interface design in environments mixing different logic families. Consider the dual-structure efficiency for space-constrained designs needing two separate decoding channels within a single footprint.

Part Context

This part belongs to the SN74LVC139A series, representing a generation of low-voltage CMOS logic designed for modern portable and battery-powered electronics. The LVC family bridges the gap between traditional 5-V TTL compatibility and emerging sub-3-V power domains, offering improved power efficiency while maintaining robust noise immunity.

Replacement Considerations

SN74LVC139ADR (SOIC Package)

FAQ

Can the enable input function as a data line?

Yes, the active-low enable (G) input can be utilized as a data line specifically for demultiplexing applications.

Is the device suitable for translating between 3.3-V and 5-V systems?

Yes, the fully buffered inputs accept voltages up to 5.5 V, allowing direct interfacing with 5-V devices while operating at lower supply voltages.