MAX491CSD+

Drivers, Receivers, Transceivers Overview

The MAX491CSD+ is a full-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single 5V supply (4.75V to 5.25V) and supports data rates up to 2.5Mbps. The device contains one driver and one receiver, featuring independent Driver Enable (DE) and Receiver Enable (RE) control pins for high-impedance state management. It includes short-circuit current limiting and thermal shutdown protection. The C suffix indicates an industrial temperature range of 0°C to +70°C, and the SD suffix denotes a 14-pin SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex communication capability with separate transmit and receive paths
• Independent enable controls allowing flexible bus management
• Integrated fault protection against short circuits and excessive power dissipation

Drivers, Receivers, Transceivers Applications

• Low-Power RS-485 Transceivers
• Low-Power RS-422 Transceivers
• Level Translators
• Industrial-Control Local Area Networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature grade. The 'C' suffix designates the commercial temperature range, while 'E' indicates extended range. Ensure the pinout matches the 14-pin configuration required for your circuit design before finalizing procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring full-duplex operation at speeds up to 2.5Mbps on a 5V system. Unlike half-duplex variants, it provides simultaneous transmission and reception. Consider the 14-pin package size relative to available board space and ensure the interface logic levels are compatible with the TTL inputs.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487 family of low-power transceivers. While similar parts in the series offer half-duplex or slew-rate-limited features, the MAX491 specifically provides full-duplex performance without slew-rate limiting, distinguishing it within the product line.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX489 is a direct functional replacement offering identical full-duplex specifications and pinout compatibility.