MAX3535EEWI+T

Overview

The MAX3535EEWI+T is a full-duplex isolated RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It provides 2500VRMS of galvanic isolation between the processor logic side and the RS-485/RS-422 bus side using integrated high-voltage capacitors. The device supports data rates up to 1000kbps and operates with a single +3V to +5.5V power supply on the logic side (VCC1). Power transfer to the isolated side (VCC2) is achieved via an external transformer driven by internal circuitry at approximately 420kHz. The receiver inputs are 1/8 unit load, supporting up to 256 devices on the bus. It features ±15kV ESD protection on interface pins, short-circuit protection, thermal shutdown, and open-line/shorted-line fail-safe functionality.

Feature Summary

• Integrated high-voltage capacitors provide 2500VRMS galvanic isolation for communication across large ground potential differences.
• Pin-selectable driver slew-rate limiting controls electromagnetic interference (EMI) and reduces signal reflections.
• Hot-swap capability protects the driver-enable input during system insertion or removal.
• Isolation-barrier fault detection alerts the processor when internal communication faults occur.

Applications

• Isolated RS-485 systems
• Systems with large common-mode voltages
• Industrial-control local area networks
• Telecommunications systems

Procurement Notes

Verify the specific ordering suffix 'E' corresponds to the -40°C to +85°C extended temperature range required for your application environment. Confirm that the Wide SO package dimensions match your PCB footprint constraints. Ensure the design includes the necessary external isolation transformer and rectification components as specified in the datasheet typical application circuit.

Selection Notes

Select this component when high-speed full-duplex communication is required across a significant isolation barrier without external optocouplers. The MAX3535E variant is suitable for designs requiring operation from +3V supplies, whereas the MXL1535E requires +4.5V minimum. Consider the 1/8 unit load receiver specification if designing multi-drop networks requiring high node density.

Part Context

This device belongs to the MAX3535E/MXL1535E family of isolated transceivers. It serves as a functionally and pin-compatible improvement over the LTC1535. The 'E' suffix denotes the extended industrial temperature range (-40°C to +85°C), while the 'C' suffix indicates the commercial range (0°C to +70°C). The 'W' indicates the Wide SOIC package type.

Replacement Considerations

MXL1535EEWI+