MAX3491ESD

Overview

The MAX3491ESD is a 3.3V, low-power, full-duplex transceiver for RS-485 and RS-422 communication systems. It integrates one driver and one receiver within a 14-pin SOIC package. The device supports data rates up to 10Mbps with an operating supply voltage range of 3.0V to 3.6V. It features a low-current shutdown mode drawing only 2nA when both RE is high and DE is low. Driver outputs are protected by short-circuit current limiting and thermal shutdown circuitry. The receiver input includes a fail-safe feature that guarantees a logic-high output if both inputs are open.

Feature Summary

• Full-duplex operation with independent driver and receiver enable controls
• Low-power shutdown mode with minimal standby current consumption
• Integrated protection against excessive power dissipation via thermal shutdown
• Fail-safe receiver design ensuring defined output states during idle conditions

Applications

• Telecommunications equipment
• Industrial-control local area networks
• EMI-sensitive applications requiring reduced signal reflections

Procurement Notes

Verify the specific suffix 'SD' corresponds to the 14-pin Small Outline package and the '-E' grade indicating extended temperature range. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors before finalizing procurement plans.

Selection Notes

Select this component for designs requiring simultaneous bidirectional data transmission at speeds up to 10Mbps. Ensure the system operates on a single 3.3V supply without charge pumps. Verify that the 14-pin footprint matches the PCB layout constraints and that the -40°C to +85°C temperature range meets environmental requirements.

Part Context

This part belongs to the MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 family of 3.3V transceivers. Unlike half-duplex variants in the series, the MAX3491 provides dedicated noninverting (Y) and inverting (Z) driver outputs alongside standard receiver inputs (A, B).

Replacement Considerations

MAX3491EEPD serves as a direct pin-compatible alternative in a 14-pin Plastic DIP package.