DS36C279MX

Overview

The DS36C279MX is a low-power RS-485 transceiver manufactured by Texas Instruments in an SOIC-8 package. It operates at a supply voltage of +5V (range: 4.75V to 5.25V) and supports data rates up to 250kb/s. The device features automatic sensing sleep mode, reducing power consumption from a maximum of 500μA to 10μA when idle. It provides ±15kV ESD protection per IEC 61000-4-2 and supports up to 128 nodes on the bus with its ¼ unit load configuration. Operating temperature ranges from -40°C to +85°C.

Feature Summary

• Automatic sensing sleep mode reduces current consumption significantly during idle periods
• Supports multipoint communication with up to 128 nodes using ¼ unit load configuration
• Integrated thermal shutdown protects against excessive power dissipation
• Fail-safe receiver ensures high output state when inputs are left open

Applications

• Multipoint data transmission systems requiring low power consumption
• Industrial automation networks with extended idle periods
• Building automation and control systems
• Portable battery-powered communication devices

Procurement Notes

Verify the exact ordering suffix matches your requirements. The MX suffix indicates tape and reel packaging. Confirm RoHS compliance status and check for any lifecycle notices such as NRND status before finalizing procurement decisions.

Selection Notes

Select this component when designing RS-485 networks requiring reduced power consumption during idle states. Consider the ¼ unit load capability for applications needing more than 32 nodes without repeaters. Ensure compatibility with existing system voltage levels and temperature requirements.

Part Context

This device belongs to Texas Instruments' DS36C2xx series of low-power RS-485 transceivers. It shares functional similarities with other members like DS36C278 and DS36C280 but offers unique sleep mode functionality not present in all variants within the family.

Replacement Considerations

Direct replacements include DS36C278MX/NOPB and DS36C280MX/NOPB. Verify pin compatibility and feature requirements before substitution. Alternative manufacturers may offer functionally equivalent parts but require thorough electrical parameter comparison.

FAQ

How does the automatic sleep mode function?

The device enters sleep mode automatically when both DE is LOW and RE* is HIGH for more than 600ns. Current consumption drops to 10μA maximum.

What is the maximum number of nodes supported?

With its ¼ unit load configuration, the DS36C279 supports up to 128 nodes on a single RS-485 bus.

Is the device compatible with RS-422 standards?

Yes, the DS36C279 is compatible with TIA/EIA-422-B standards in addition to being fully RS-485 compliant.