MAX3491EESD+T

Overview

The MAX3491EESD+T is a full-duplex RS-485/RS-422 transceiver operating from a single +3.0V to +3.6V supply. It supports data rates up to 12Mbps with a typical propagation delay of 22ns and skew of 8ns. The device features ±15kV ESD protection (HBM/Air-Gap) and ±8kV contact discharge protection. It includes driver short-circuit current limiting and thermal shutdown, plus a receiver fail-safe for open inputs. Operating temperature range is -40°C to +85°C. Supply current is typically 2.2mA active and 2nA in shutdown mode.

Feature Summary

• Full-duplex communication with dedicated differential transmit and receive lines
• Enhanced electrostatic discharge protection on all I/O pins
• Low-power shutdown mode with minimal standby current consumption
• Fail-safe receiver design ensuring logic-high output during open-circuit conditions

Applications

• Telecommunications systems
• Industrial-control local area networks
• EMI-sensitive applications requiring reduced emissions
• Integrated services digital networks
• Packet switching environments

Procurement Notes

Verify the specific suffix '+T' indicates tape-and-reel packaging configuration. Confirm the 'EE' designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure compatibility with existing PCB footprints for the SOIC-14 package before finalizing procurement orders.

Selection Notes

Select this component when full-duplex operation is required alongside high-speed 12Mbps transmission. It is suitable for designs needing robust ESD protection without external components. Compare against half-duplex variants if bidirectional signaling on a single pair is sufficient for the application requirements.

Part Context

This part belongs to the MAX3483E family of low-power, 3.3V transceivers designed for RS-485 and RS-422 communications. It shares core electrical characteristics with siblings like the MAX3485E and MAX3490E but differs in duplex capability and pin count. The MAX3491E specifically provides separate driver and receiver outputs for full-duplex functionality.

Replacement Considerations

ADM3491ARZ is a confirmed functional substitute offering similar full-duplex RS-485/RS-422 capabilities.