MAX3491AEASD+

Overview

The MAX3491AEASD+T is a 3.3V, low-power, full-duplex transceiver for RS-485 and RS-422 communication, manufactured by Analog Devices Inc./Maxim Integrated. It contains one driver and one receiver in a 14-pin SOIC package (Package Code S14+1). The device operates from a single 3.0V to 3.6V supply with a typical supply current of 2.2mA and a shutdown current of 2nA. It supports data rates up to 10Mbps with a maximum skew of 8ns. The receiver input resistance is 12kΩ, allowing up to 32 transceivers on the bus. It features a -7V to +12V common-mode input range, thermal shutdown, and short-circuit current limiting.

Feature Summary

• Full-duplex operation with dedicated differential transmit and receive lines
• Low-power shutdown mode drawing typically 2nA when RE is high and DE is low
• Fail-safe receiver guarantees logic-high output if inputs are open circuit
• Driver outputs protected against excessive power dissipation via thermal shutdown

Applications

• Telecommunications systems
• Industrial-control local area networks
• EMI-sensitive applications requiring low-power interface solutions

Procurement Notes

Verify the specific suffix ASD+T corresponds to the SO-14 tape-and-reel packaging variant. Confirm the 'E' designation indicates the extended temperature range of -40°C to +85°C. Ensure the component meets RoHS compliance requirements as indicated by the '+' suffix in the ordering information.

Selection Notes

Select this part for full-duplex RS-485/RS-422 applications requiring independent driver and receiver control. It is suitable where low standby power is critical due to the 2nA shutdown capability. Choose this over half-duplex variants like the MAX3485 when simultaneous bidirectional communication is required.

Part Context

The MAX3491 belongs to the MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 family of 3.3V transceivers. Unlike the half-duplex MAX3485 or the slew-rate-limited MAX3483, the MAX3491 provides full-duplex connectivity with separate Y/Z driver outputs and A/B receiver inputs in a 14-pin package.

Replacement Considerations

MAX3491ESD+ is the tube-packaged equivalent with the same electrical specifications and extended temperature range.