MAX3535ECWI+

Overview

The MAX3535ECWI+ is a full-duplex isolated RS-485/RS-422 transceiver providing 2500VRMS galvanic isolation between the logic side and the interface side. It supports data rates up to 1000kbps with a +3V to +5.5V supply range on the logic side (VCC1) and +3.13V to +7.5V on the isolated side (VCC2). The device includes one differential driver and one receiver, utilizing internal high-voltage capacitors for signal transmission and an external transformer for power transfer via ST1/ST2 pins. It features ±15kV HBM ESD protection, pin-selectable slew-rate limiting, and open-line/shorted-line fail-safe inputs.

Feature Summary

• Integrated high-voltage capacitors provide 2500VRMS of galvanic isolation without requiring external components for data transmission.
• Pin-selectable slew-rate limiting controls electromagnetic interference (EMI) and reduces reflections on the bus.
• 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 suffix 'CWI' corresponds to the commercial temperature range (0°C to +70°C) and Wide SOIC package. Confirm the '+' indicates lead-free compliance. Ensure the required external isolation transformer matches the voltage requirements for the MAX3535E series, as distinct from the MXL1535E variant.

Selection Notes

Select this component when full-duplex communication across a high-voltage barrier is required. The MAX3535E supports a wider logic-side voltage range (+3V to +5.5V) compared to the MXL1535E (+4.5V to +5.5V), allowing for more flexible power supply designs. Verify that the application requires 256 unit loads on the bus and benefits from integrated ESD protection.

Part Context

The MAX3535E is part of the Maxim Integrated family of isolated transceivers designed for robust industrial communication. It serves as a functionally compatible improvement over previous generations like the LTC1535, offering enhanced power efficiency and integrated isolation capabilities in a 28-pin Wide SOIC package.

Replacement Considerations

MXL1535ECWI+: Functionally and pin-compatible but operates with a restricted logic-side supply range of +4.5V to +5.5V. Verify power supply constraints before substituting.