MAX3085CSA+

Overview

The MAX3085CSA+ is a half-duplex RS-485/RS-422 transceiver featuring one driver and one receiver. It supports data rates up to 500kbps with slew-rate-limited drivers. The device operates from a single +5V supply (4.75V to 5.25V) and draws 375µA of quiescent current. It incorporates fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. The unit-load receiver input impedance allows up to 256 transceivers on the bus. It is housed in an 8-pin SOIC package and operates within a temperature range of 0°C to +70°C.

Feature Summary

• Fail-safe circuitry ensures a logic-high receiver output during idle or fault conditions
• Slew-rate-limited drivers minimize electromagnetic interference and signal reflections
• 1/8-unit-load receiver input impedance supports high node density on the bus

Applications

• RS-422/RS-485 communications
• Industrial-control local area networks
• Level translators for EMI-sensitive applications

Procurement Notes

Verify the specific suffix CSA+ against official documentation to confirm the 8-pin SOIC package, commercial temperature range, and lead-free status. Ensure the ordering code matches the exact manufacturer part number to avoid functional discrepancies related to packaging or environmental compliance.

Selection Notes

Select this component for half-duplex applications requiring transmission speeds up to 500kbps. It is suitable for systems needing fail-safe behavior and reduced EMI through slew-rate limiting. Verify that the required operating temperature range aligns with the commercial specification limits provided in the datasheet.

Part Context

This device belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485 and RS-422 communication standards. The family includes variants supporting different duplex modes and data rates ranging from 115kbps to 10Mbps. All devices share common features such as thermal shutdown and low-power shutdown modes.

Replacement Considerations

The MAX3085ECSA+ offers the same electrical functionality but extends the operating temperature range to -40°C to +85°C. Other pin-compatible options within the series include the MAX3082 and MAX3088 for 115kbps operation, and the MAX3086, MAX3087, and MAX3088 for 10Mbps operation.