MAX490CSA+

Drivers, Receivers, Transceivers Overview

The MAX490CSA+ is a low-power, full-duplex transceiver designed for RS-485 and RS-422 communication applications. It integrates one driver and one receiver within an 8-pin SO package. The device supports data transmission rates up to 2.5Mbps with unrestricted slew rates. It operates from a single 5V supply, drawing a typical quiescent current of 300µA when enabled. The transceiver features short-circuit current limiting and thermal shutdown protection for the driver outputs. Additionally, it includes a fail-safe receiver input that guarantees a logic-high output state if the differential input lines are left open.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex operation enables simultaneous bidirectional data transmission on multipoint bus networks.
• Integrated thermal shutdown circuitry protects against excessive power dissipation by forcing outputs to a high-impedance state.
• Fail-safe receiver design ensures a defined logic-high output state during open-circuit input conditions.

Drivers, Receivers, Transceivers Applications

• Low-power RS-485 communication networks
• RS-422 point-to-point or multipoint links
• Industrial control local area networks
• EMI-sensitive application environments

Drivers, Receivers, Transceivers Procurement Notes

Verify the component authenticity by checking the marking code and package integrity against official Analog Devices specifications. Confirm the suffix CSA corresponds to the 8-pin Small Outline package and commercial temperature range. Ensure the ordering information matches the specific revision required for your design implementation.

Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring full-duplex connectivity at speeds up to 2.5Mbps. It is suitable for systems powered by a standard 5V rail where moderate power consumption is acceptable. Consider alternative models like the MAX487 if quarter-unit-load impedance for higher node counts is required, or MAX483 if reduced EMI via slew-rate limiting is necessary.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX481/MAX483/MAX485/MAX487–MAX491 family of low-power transceivers. While sharing similar pinouts and basic functionality with half-duplex variants, the MAX490 specifically provides independent transmit and receive paths. This distinguishes it from the MAX485 series, which shares pins for both directions.

Drivers, Receivers, Transceivers Replacement Considerations

Publicly confirmed substitute part numbers include MAX490ESA (Extended Temperature), MAX490EPA (Plastic DIP), and MAX490CUA (µMAX). These variants maintain identical electrical characteristics and pin configurations while differing in operating temperature range or physical package style.