Click here for production status of specific part numbers. MAX33072E/MAX33073E +3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with 65V Fault Protection, 40V CMR, and 40kV ESD General Description Benefits and Features The MAX33072E/MAX33073E are a family of fault-pro- Integrated Protection for Robust Communication tected RS-485/RS-422 transceivers with high 65V pro- Protection on Driver Outputs/Receiver Inputs (A, B tection for overvoltage conditions on the communication Data Lines) bus lines, ensuring robust protection in harsh industrial 65V Fault Protection Range on Driver Outputs/ environments. Both devices have 40V of common-mode Receiver Inputs range (CMR) within V (+4.5V to +5.5V), exceeding the 40V Common-Mode Range on Driver Outputs/ CCH RS-485 standard of -7V to +12V, suitable for electrically Receiver Inputs noisy environments where different systems have shifting 40kV Human Body Model (JEDEC ground levels relative to each other. They also incorporate JS-001-2017) ESD Protection a high ESD protection circuit capable of protecting against 15kV Air Gap Discharge (IEC 61000-4-2) ESD 40kV of ESD HBM (human body model) for driver out- Protection puts and receiver inputs (A and B data lines). Each device 10kV Contact Discharge (IEC 61000-4-2) ESD contains one driver and one receiver and operates over Protection the +3V to +5.5V supply range, making it convenient for Hot-Swap Protection designers to use one part with either +3.3V or +5V supply Short Circuit Protection voltages across multiple end equipment. Thermal Shutdown True Fail-Safe Guarantees Known Receiver Output These devices feature a polarity selection input (POL) that State swaps the A and B data lines, allowing for software cor- Wide Operating Temperature Range from -40C to rection of cross-wired field cables. +125C The MAX33072E features slew-rate-limited outputs for da- High-Performance Transceiver Enables Flexible ta rates up to 500kbps, while the MAX33073E is rated Designs up to 2Mbps for applications requiring higher bandwidth. Compliant with RS-485 EIA/TIA-485 Standard These transceivers are optimized for robust communica- 500kbps (MAX33072E), 2Mbps (MAX33073E) tion in noisy environments. A true failsafe feature guaran- Maximum Data Rate tees a logic-high on the receiver output when the inputs 3V to 5.5V Supply Range are open or shorted. Driver outputs are protected against 1/8 Unit Load for up to 256 Devices on the Bus short-circuit conditions. The receivers feature a 1/8 unit load input impedance, allowing up to 256 transceivers Ordering Information appears at end of data sheet. on a bus. The MAX33072E/MAX33073E are available in 8-pin SOIC and operate over the -40C to +125C temper- ature range. Applications Industrial Automation Equipment Home and Building Automation Agriculture and Heavy Machinery Power Supply and UPS Elevator Control Motion Controllers 19-100766 Rev 0 03/20MAX33072E/MAX33073E +3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with 65V Fault Protection, 40V CMR, and 40kV ESD Simplified Block Diagram V CC MAX33072E/MAX33073EMAX33072E/MAX33073E POL RO R B DE A DI D GND 19-100766 www.maximintegrated.com Maxim Integrated 2 INVERT PROTECTION