DS36C279MX/NOPB

Overview

The DS36C279MX/NOPB is a low-power RS-485 transceiver manufactured by Texas Instruments in an SOIC-8 package. It supports data rates up to 250 kb/s and operates on a single +5V supply (4.75V to 5.25V). The device features automatic sensing sleep mode, reducing current consumption from a maximum of 500 μA to 10 μA when both driver and receiver are disabled for over 600 ns. It provides ¼ unit load capability, supporting up to 128 nodes on the bus. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Automatic sensing sleep mode reduces power consumption significantly during idle periods
• Supports up to 128 nodes on a single differential bus line
• Includes thermal shutdown circuitry to prevent damage from excessive power dissipation
• Features fail-safe receiver design ensuring high output state with open inputs

Applications

• Multipoint data transmission systems requiring low standby power
• Industrial communication networks utilizing RS-485 standard
• Battery-powered devices where extended sleep intervals occur between transmissions

Procurement Notes

Verify the specific suffix MX/NOPB against the latest TI Package Option Addendum to confirm availability status and lead-free compliance. Ensure the ordering information matches the required SOIC-8 packaging specifications before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high node density without repeaters due to its ¼ unit load specification. Consider the automatic sleep mode functionality if minimizing quiescent current during inactive bus states is a primary design constraint.

Part Context

This part belongs to the DS36C27x family of low-power RS-485 transceivers. It shares architectural similarities with the DS36C278 and DS36C280 but distinguishes itself through the inclusion of the automatic sleep mode feature not present in all sibling variants.

Replacement Considerations

Public datasheets list the LTC485, MAX485, DS75176, and DS36954 as drop-in replacements. Verify pinout compatibility and electrical parameter alignment before substituting these parts.

FAQ

How does the device enter sleep mode?

The device enters sleep mode automatically when both the Driver Enable (DE) pin is logic low and the Receiver Enable (RE*) pin is logic high for more than 600 ns.

What is the maximum number of nodes supported?

The DS36C279 supports up to 128 nodes on the bus because it utilizes a ¼ unit load input specification.

Is there protection against overheating?

Yes, the device includes onboard thermal shutdown circuitry that forces the driver outputs into a high impedance state if excessive power dissipation occurs.