Exar – XR3070: Industry’s Lowest Power, Fault Tolerant RS-485/422 Transceiver





XR3070: Industry’s Lowest Power, Fault Tolerant RS-485/422 Transceiver The XR307x family of high performance RS-485/422 devices are designed for improved performance in noisy industrial environments and increased tolerance to system faults. The analog bus pins can withstand direct shorts up to ±18V, and are protected against ESD events up to ±15kV. The differential high output driver delivers 10% higher SNR than standard RS-485/422 devices, affording additional noise margin or extended cable lengths. The receivers include full fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are open, shorted, or undriven. The receiver input impedance is at minimum 96kΩ (1/8 unit load), allowing up to 256 devices on the bus while preserving the full signal margin.

• 10% higher SNR compared to other RS-485 devices
• ±15kV IEC 61000-4-2 air gap discharge
• +3.0V to +3.6V operation (3.3V ±10%)
• Enhanced receiver fail-safe protection
• Driver short circuit current limit and thermal shutdown
• 1/8th unit load allows up to 256 devices on bus
• ±18V fault tolerance on analog bus pins
• ±15kV human body model
• 300µA idle current, 1nA shutdown current
• Hot-swap glitch protection on DE and RE pins
• Industry standard 8 and 14 NSOIC packages