MAX22028FAWA+

Drivers, Receivers, Transceivers Overview

The MAX22028FAWA+ is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring Maxim’s proprietary AutoDirection control. It provides 3.5kVRMS of digital galvanic isolation between the UART side and the cable side. The device supports data rates up to 16Mbps with non-slew-rate-limited drivers. It operates with VDDA from 1.71V to 5.5V and VDDB from 4.75V to 5.25V. The receiver output always follows (VA-VB). Driver outputs and receiver inputs are protected against ±10kV ESD (HBM) to GNDB. It is housed in an 8-pin wide SOIC package and operates over a temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• AutoDirection control eliminates the need for separate driver-enable and receiver-enable signals by using an internal state machine.
• High-level integration reduces solution size through a fully isolated half-duplex design in a compact 8-pin wide body SOIC package.
• Integrated protection includes ±10kV ESD on driver outputs and receiver inputs, along with a failsafe receiver preventing fault transitions during input shorts or open events.

Drivers, Receivers, Transceivers Applications

• Utility Meters
• Industrial Automation Equipment
• Programmable Logic Controllers
• HVAC Systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'F' indicates the inclusion of the failsafe receiver feature compared to standard variants. Confirm the 'AWA+' designation corresponds to the 8-pin wide SOIC package and RoHS compliance status as defined in the manufacturer's ordering information. Ensure compatibility with the required isolation voltage ratings for the target application environment.

Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed communication up to 16Mbps is required alongside robust galvanic isolation. The MAX22028FAWA+ is suitable for designs needing automatic bus direction control without external logic. Consider the failsafe receiver capability if protection against open or shorted bus lines is necessary. Verify power supply requirements match the specified VDDA and VDDB ranges.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX22025-MAX22028/MAX22025F-MAX22028F family of compact isolated RS-485/RS-422 transceivers. The 'F' suffix distinguishes it from non-failsafe variants by providing guaranteed logic-high output during receiver input faults. The 'MAX22028' variant specifically offers 16Mbps data rates with unrestricted slew rates, differentiating it from the 0.5Mbps limited versions in the series.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX22028AWA+ serves as a direct functional substitute within the same family, differing primarily in the absence of the failsafe receiver feature found in the FAWA+ variant. Both share identical pinouts, isolation characteristics, and maximum data rates.