MAX3491ESD-T

Overview

The MAX3491ESD-T is a full-duplex RS-485/RS-422 transceiver operating from a single 3.0V to 3.6V supply. It integrates one driver and one receiver with a guaranteed data rate of 10Mbps. The device features a low-power shutdown mode drawing typically 2nA when RE is high and DE is low. Electrical characteristics include a maximum propagation delay skew of 8ns, a common-mode input range of -7V to +12V, and thermal shutdown protection. It is housed in a 14-pin SOIC package (S14+1) and operates within an extended temperature range of -40°C to +85°C.

Feature Summary

• Full-duplex communication capability with independent driver and receiver enable controls
• Low-power shutdown mode for significant current reduction during idle periods
• Fail-safe receiver design ensuring a logic-high output when inputs are open
• Driver overload protection via short-circuit current limiting and thermal shutdown

Applications

• Telecommunications systems requiring robust serial data transmission
• Industrial-control local area networks (LANs)
• Transceivers for EMI-sensitive applications utilizing standard RS-485/RS-422 protocols

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration. Confirm the 'E' designation aligns with the required -40°C to +85°C industrial temperature grade. Ensure the 14-pin SOIC footprint matches the target PCB land pattern specifications before finalizing procurement orders.

Selection Notes

Select this component for designs requiring full-duplex operation at speeds up to 10Mbps on a 3.3V supply. It is suitable for multipoint bus networks supporting up to 32 transceivers. Consider the 14-pin package constraints and verify that the external control logic can manage the separate RE and DE pins for proper half/full-duplex switching.

Part Context

This part belongs to the MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 family of 3.3V low-power transceivers. Unlike the half-duplex variants in this series, the MAX3491 provides simultaneous transmit and receive paths. It maintains interoperability with +5V logic while eliminating the need for internal charge pumps found in older generations.

Replacement Considerations

MAX3491ESD is the direct non-tape equivalent. MAX3491EPD serves as the plastic DIP alternative. Cross-reference with ADM3491 for newer Analog Devices equivalents, noting potential differences in pinout or feature sets such as fault protection.