MAX3085CSA-T

Overview

The MAX3085CSA-T is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates one driver and one receiver within an 8-pin SOIC package. The device supports data transmission rates up to 500kbps with slew-rate-limited drivers to minimize EMI. It operates on a single +5V supply (4.75V to 5.25V) and draws a typical quiescent current of 375µA. Fail-safe circuitry ensures a logic-high receiver output when inputs are open or shorted. The receiver input impedance is 1/8-unit-load, allowing up to 256 transceivers on the bus.

Feature Summary

• Fail-safe circuitry guarantees a logic-high receiver output when inputs are open or shorted
• Slew-rate-limited drivers minimize electromagnetic interference and reduce reflections
• 1/8-unit-load receiver input impedance supports up to 256 devices on the bus

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Confirm RoHS compliance status as required by project specifications. Ensure the component matches the exact manufacturer part number to guarantee functional compatibility and electrical characteristics.

Selection Notes

Select this component for half-duplex RS-485/RS-422 applications requiring 500kbps data rates. The integrated fail-safe feature provides robustness against bus faults. The low quiescent current makes it suitable for power-constrained systems. Verify that the 8-pin SOIC package fits the target PCB layout constraints.

Part Context

This device belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485/RS-422 communication. The family includes variants with different duplex modes and data rate capabilities. The MAX3085 specifically targets half-duplex operations with intermediate speed requirements between the 115kbps and 10Mbps models.

Replacement Considerations

Pin-compatible alternatives include the MAX3082 and MAX3088, though these operate at different maximum data rates. Verify that any substitute maintains the required 500kbps capability and half-duplex configuration.