MAX22026F

The MAX22025–MAX22028/MAX22025F–MAX22028F compact isolated RS-485/ RS-422 transceivers provide 3.5kV_RMS of digital galvanic isolation between the cable-side (RS-485/RS-422 driver/ receiver-side) and the UART-side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 0.5Mbps or 16Mbps.

The MAX22025–MAX22028/MAX22025F–MAX22028F feature Maxim’s proprietary AutoDirection control making these devices ideal for applications such as isolated RS-485 ports, where the driver input is used in conjunction with the driver-enable signal to drive the differential bus.

The MAX22025/MAX22027/MAX22025F/MAX22027F feature reduced slew rate drivers that minimize EMI and reduce reflections caused by improper termination of cable allowing error-free transmission up to 0.5Mbps. The MAX22026/MAX22028/MAX22026F/MAX22028F driver outputs are not slew-rate limited, allowing transmit speeds up to 16Mbps.

The receiver output of the MAX22025/MAX22026/MAX22025F/MAX22026F does not follow (V_A-V_B) when the device is in the driverenabled state. The receiver output on the MAX22027/MAX22028/MAX22027F/ MAX22028F always follows (V_A-V_B).

The driver outputs and receiver inputs are protected from ±10kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM). The MAX22025–MAX22028/MAX22025F–MAX22028F are available in a compact 8-pin wide body SOIC package and operate over the -40°C to +85°C temperature range.

Applications

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