MAX3491EESD

Overview

The MAX3491EESD+ is a true RS-485/RS-422 transceiver operating from a single +3.3V supply without requiring a charge pump. It supports data rates up to 12Mbps and features ±15kV ESD protection on all I/O pins. The device provides full-duplex communication with one driver and one receiver in a 14-pin SOIC package. It includes a low-power shutdown mode drawing typically 2nA, fail-safe receiver inputs, and thermal shutdown for driver overload protection.

Feature Summary

• Full-duplex operation with independent driver and receiver enable controls
• Integrated ±15kV ESD protection compliant with IEC 1000-4-2 standards
• Low-power shutdown mode with minimal standby current consumption
• Fail-safe receiver guarantees high output state during open-circuit conditions

Applications

• Telecommunications systems
• Industrial-control local area networks
• EMI-sensitive applications requiring reduced reflections
• Integrated Services Digital Networks (ISDN)
• Packet switching environments

Procurement Notes

Verify the specific suffix 'ESD+' against the manufacturer's latest documentation to confirm RoHS compliance and lead-free status. Ensure the ordering code matches the required 14-pin SOIC package variant. Cross-reference the part number with official distributor catalogs to confirm current production status and availability constraints before finalizing procurement plans.

Selection Notes

Select this component when full-duplex RS-485 or RS-422 communication is required at speeds up to 12Mbps. It is suitable for designs needing robust ESD protection and low power consumption. Compare against half-duplex variants like the MAX3485E if bidirectional single-wire transmission suffices. Verify that the 14-pin SOIC footprint aligns with the target PCB layout constraints.

Part Context

This device belongs to the MAX3483E family of 3.3V low-power transceivers. It shares core electrical characteristics with the MAX3485E and MAX3490E but differs in duplex capability and pin count. The MAX3491E specifically offers full-duplex performance in a 14-pin package, distinguishing it from the 8-pin half-duplex counterparts within the same product line.

Replacement Considerations

The MAX3490E serves as a functional alternative for full-duplex applications but utilizes an 8-pin package. Designers must account for significant pinout differences and potential board layout modifications when substituting between these variants.