MAX481CSA+

Overview

The MAX481CSA+ is a low-power, half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates one driver and one receiver in an 8-pin SO package. The device supports data rates up to 2.5Mbps with a typical quiescent supply current of 300µA. It operates from a single 5V supply (4.75V to 5.25V) within the commercial temperature range of 0°C to +70°C. Key features include independent Driver Enable (DE) and Receiver Enable (RE) controls, a low-current shutdown mode consuming 0.1µA, and fail-safe receiver inputs that guarantee a logic-high output when the bus is open.

Feature Summary

• Independent driver and receiver enable pins allow precise control over transmission and reception states.
• Low-power shutdown mode significantly reduces supply current consumption for energy-efficient applications.
• Fail-safe receiver design ensures a defined high logic state at the output if the differential input lines are left open.

Applications

• Industrial-control local area networks
• Low-power RS-485 communication systems
• EMI-sensitive applications requiring controlled slew rates or low power

Procurement Notes

Verify the specific suffix CSA against official manufacturer documentation to confirm the 8-pin SO package and 0°C to +70°C operating temperature range. Ensure compatibility with system voltage requirements of 4.75V to 5.25V. Cross-reference part numbers with authorized distributors to confirm availability and authenticity, as component specifications may vary by revision.

Selection Notes

Select the MAX481CSA+ for half-duplex RS-485 or RS-422 applications requiring data rates up to 2.5Mbps. This component is suitable for systems needing independent driver and receiver control and low standby power consumption via its shutdown feature. It is not appropriate for full-duplex applications or environments exceeding the specified commercial temperature limits.

Part Context

The MAX481 is part of the Maxim Integrated low-power transceiver family, designed for bidirectional data communications on multipoint bus transmission lines. It shares architectural similarities with the MAX483, MAX485, and MAX487 but is distinguished by its higher 2.5Mbps data rate capability and lack of slew-rate limiting compared to the MAX483.

Replacement Considerations

The MAX485CSA+ serves as a functional substitute within the same family, offering identical pinout and half-duplex operation. However, the MAX485 lacks the low-power shutdown mode found in the MAX481. Designers must verify that the absence of the shutdown feature aligns with system power management requirements.