DS485N/NOPB

Overview

The DS485N/NOPB is a low-power RS-485/RS-422 multipoint transceiver manufactured by Texas Instruments. It features 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 a typical quiescent current of 200 μA. It provides a common-mode input voltage range of -7V to +12V and supports up to 32 transceivers on the bus. Characterized for commercial temperature operation (0°C to +70°C), it is housed in an 8-pin PDIP package.

Feature Summary

• Half-duplex flow-through pinout compatible with MAX485 and LTC485
• Short-circuit current limiting and thermal shutdown protection
• Failsafe receiver feature ensuring logic-high output when inputs are open

Applications

• Multipoint RS-485 communication networks
• RS-422 point-to-point or multipoint links
• Industrial control systems requiring low power consumption

Procurement Notes

Verify the component status as LIFEBUY, indicating discontinuation with a lifetime-buy period available. Confirm the specific ordering suffix matches the required package type and temperature range. Ensure compliance with RoHS standards and check for any relevant environmental certifications before finalizing procurement orders.

Selection Notes

Select this component for applications requiring standard RS-485/RS-422 compatibility with low power consumption. Verify that the operating temperature range meets the system requirements, as this specific part is rated for commercial temperatures. Consider alternative parts if industrial temperature ranges (-40°C to +85°C) are necessary.

Part Context

The DS485 series includes variants such as the DS485M/NOPB (SOIC package) and DS485TM/NOPB (industrial temperature). The DS485N/NOPB specifically denotes the PDIP package variant. Related ultra-low power options include the DS36C278 and DS36C279 series.

Replacement Considerations

Pin and functionally compatible replacements include the MAX485 and LTC485. For industrial temperature requirements, consider the DS485TM/NOPB.