MAX3085ECSA+

Overview

The MAX3085ECSA+ is a half-duplex RS-485/RS-422 transceiver in an 8-pin SOIC package. It operates from a single +5V supply (4.75V to 5.25V) with a typical quiescent current of 600µA. The device supports data rates up to 500kbps via fixed slew-rate limiting and features ±15kV ESD protection on I/O pins. It includes fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted, ensuring bus stability during idle states.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output state when differential inputs are open or shorted.
• Enhanced slew-rate limiting minimizes electromagnetic interference and reduces signal reflections on improperly terminated cables.
• Integrated ±15kV electrostatic discharge protection on all transmitter outputs and receiver inputs.
• Half-duplex architecture allows up to 256 transceivers on the bus through 1/8-unit-load receiver input impedance.

Applications

• RS-422 and RS-485 communication networks
• Industrial control local area networks
• Level translation for serial data interfaces

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C) rather than the industrial range (-40°C to +85°C). Confirm the 'SA+' designation corresponds to the narrow SOIC-8 package and lead-free compliance status as defined by the manufacturer's ordering guide.

Selection Notes

Select this component for applications requiring moderate speed up to 500kbps with reduced EMI characteristics. Ensure the system operates within the commercial temperature range. Verify that the half-duplex configuration aligns with the bidirectional data flow requirements of the target network topology.

Part Context

This part belongs to the MAX3080E–MAX3089E family of high-speed transceivers. It shares pin compatibility with industry-standard devices like the SN75180 but incorporates enhanced ESD protection and fail-safe features. The MAX3085E specifically provides fixed slew-rate limiting for improved signal integrity at higher speeds compared to the 115kbps variants.

Replacement Considerations

Pin-compatible alternatives include the MAX3085ESA+ for industrial temperature ranges and the MAX3485 series for 3.3V operation. Verify voltage levels and temperature specifications before substitution.