DS485TMX/NOPB

Overview

The DS485TMX/NOPB is a low-power RS-485/RS-422 multipoint transceiver manufactured by Texas Instruments. It integrates one driver and one receiver, supporting data rates up to 2.5 Mbps with a typical driver transition time of 25 ns. The device operates from a single +5V supply (4.75V to 5.25V) and draws 200 μA quiescent current. It features a common-mode input voltage range of -7V to +12V and supports up to 32 transceivers on the bus. Packaged in an 8-pin SOIC, it functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Low power consumption with 200 μA typical quiescent current
• Failsafe receiver ensures logic-high output when inputs are open
• Thermal shutdown protects against excessive power dissipation
• Pin and functional compatible with MAX485 and LTC485

Applications

• Multipoint RS-485 communication networks
• Industrial control systems requiring robust differential signaling
• Building automation and security systems

Procurement Notes

Verify the specific ordering suffix to confirm package type and temperature rating. The 'TMX' designation indicates an SOIC-8 package with an industrial temperature range (-40°C to +85°C). Confirm RoHS compliance status as indicated by the '/NOPB' suffix. Ensure the component meets the required environmental specifications for the intended deployment environment before finalizing procurement.

Selection Notes

Select this component for applications requiring standard RS-485 multipoint connectivity with low standby power. It is suitable for designs needing compatibility with legacy MAX485 pinouts. Consider alternative devices if higher data rates or extended common-mode ranges beyond ±12V are required. Verify that the 2.5 Mbps rate aligns with system timing requirements.

Part Context

This part belongs to the DS485 family of low-power transceivers designed for half-duplex communication. It serves as a direct replacement for similar industry-standard parts like the MAX485. The device is characterized for industrial temperature operation and provides reliable performance in noisy environments through its wide common-mode rejection capabilities.

Replacement Considerations

The datasheet explicitly states the device is pin and functionally compatible with the MAX485 and LTC485. Designers can substitute these components directly without schematic modifications, provided the electrical parameters meet the application's specific voltage and speed requirements.