Exar Corp. announced a family of half duplex RS-485 transceivers optimized to operate over a wide 2.8 V to 5.5 V supply voltage range. The wide operating range makes these transceivers ideal for isolated applications where the remote devices are powered through the cable. The XR33032/5/8 wide supply transceivers can tolerate significant voltage drop along the cable resistance and still maintain compliant RS-485 output levels and performance, even with a 2 V voltage drop in the cable (when utilizing a remote 5 V power supply).
The XR3303x product family offers industry-leading ±18 V Fault Tolerance for direct shorts to DC or AC, ±70 V Transient Protection, and exceeds the highest ESD rating of IEC 61000-4-2 Level 4. These rugged features remove the need for additional protection components, allowing system designers to increase the reliability of isolated industrial networks, remote meter reading, process control and monitoring, GSM/GPRS modules, building automation, HVAC control, and security systems.
The XR33032/5/8 half duplex RS-485 transceivers support 250 kbps, 1 Mbps, and 10 Mbps data rates and are fully compliant to the TIA/EIA-485 and TIA/EIA-422 standards when operated above 3.0V. The analog bus pins are protected against severe ESD events exceeding IEC level 4 (+/-15kV IEC 61000-4-2 Air Gap Discharge, +/-8kV IEC 61000-4-2 Contact Discharge, +/-15kV Human Body Model), and can tolerate direct shorts to DC or AC voltages as high as +/-18V.
source: http://powerelectronics.com/pmics/wide-operating-range-rs-485-transceivers-0
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