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 in a 14-pin SO package, supporting data rates up to 10Mbps with an 8ns maximum skew. The device features a low-current shutdown mode drawing typically 2nA when RE is high and DE is low. Driver outputs are protected by short-circuit current limiting and thermal shutdown circuitry. The receiver includes a fail-safe feature ensuring a logic-high output if inputs are open. Common-mode input voltage ranges from -7V to +12V.

Feature Summary

• Full-duplex communication capability with independent driver and receiver enable controls
• Low-power shutdown mode for significant energy savings during idle periods
• Integrated protection against excessive power dissipation via thermal shutdown and current limiting
• Fail-safe receiver design guarantees a defined high state under open-input conditions

Applications

• Telecommunications systems requiring robust serial data transmission
• Industrial-control local area networks (LANs)
• EMI-sensitive applications utilizing the component's electrical characteristics

Procurement Notes

Verify the specific suffix 'SD' corresponds to the 14-pin Small Outline package and the 'E' designation indicates the extended temperature range of -40°C to +85°C. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring simultaneous bidirectional data transfer at speeds up to 10Mbps. Ensure the application environment falls within the specified -40°C to +85°C operational temperature range. Verify that the system logic levels are compatible with the 3.3V supply voltage requirements and that the 14-pin footprint fits the board layout constraints.

Part Context

This part belongs to the MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 family of 3.3V low-power transceivers. Unlike half-duplex variants such as the MAX3485, the MAX3491 provides dedicated transmit and receive paths. It shares the industry-standard pinout compatibility with other devices in the series while offering full-duplex functionality in a slightly larger package.

Replacement Considerations

MAX3490ESA+T offers identical electrical performance but utilizes an 8-pin package instead of the 14-pin configuration required for full-duplex operation.