MAX3535EEWI+

Overview

The MAX3535EEWI+ 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 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. It features one differential driver and one receiver, with 1/8 unit load receivers allowing up to 256 devices on the bus. The component includes ±15kV ESD protection, hot-swap capability, and isolation-barrier fault detection.

Feature Summary

• Integrated high-voltage capacitors provide 2500VRMS galvanic isolation for systems with large common-mode voltage differences.
• Pin-selectable slew-rate limiting controls electromagnetic interference (EMI) and reduces signal reflections.
• Hot-swap-protected driver-enable input prevents bus contention during system power-up or removal.
• Isolation-barrier fault detection circuitry alerts the processor when internal communication faults occur.

Applications

• Isolated RS-485 communication systems
• Industrial-control local area networks
• Telecommunications systems requiring galvanic isolation

Procurement Notes

Verify the specific ordering suffix EEWI against the manufacturer's current datasheet to confirm the extended temperature range (-40°C to +85°C) and Wide SOIC package configuration. Ensure compatibility with external transformer selection requirements for the isolated-side power transfer, as the MAX3535E requires an external transformer connected to ST1 and ST2 pins for operation.

Selection Notes

Select this component when designing systems that require robust isolation between control logic and noisy industrial buses. The MAX3535E variant supports a wider logic-side supply range (+3V to +5.5V) compared to the MXL1535E, offering flexibility in low-voltage applications. Confirm that the application environment falls within the specified -40°C to +85°C operating temperature range for the EE suffix.

Part Context

The MAX3535E/MXL1535E series represents a family of isolated transceivers designed for reliable communication across isolation barriers. The MAX3535E specifically targets applications needing a broader logic-side voltage range, while the MXL1535E serves as a pin-compatible improvement over the LTC1535. Both variants utilize the same functional architecture but differ in supply voltage specifications.

Replacement Considerations

MXL1535EEWI+