XR3070-78X LOW POWER 18V TOLERANT RS-485/RS-422 +3.3V TRANSCEIVERS SEPT 2013 REV. 1.0.0 GENERAL DESCRIPTION FEATURES The XR3070-78X family of high performance RS-485/ 10% Higher SNR (Signal-to-Noise Ratio) 422 devices are designed for improved performance in compared to other RS-485 devices (1.65V vs. 1.5V) noisy industrial environments and increased tolerance 18V Fault Tolerance on Analog Bus pins to system faults. Robust ESD (ElectroStatic Discharge) Protection: The analog bus pins can withstand direct shorts up to 15kV IEC 61000-4-2 Air Gap Discharge 18V, and are protected against ESD events up to 8kV IEC 61000-4-2 Contact Discharge 15kV. The differential high output driver delivers 10% 15kV Human Body Model higher SNR than standard RS-485/422 devices, afford- 4kV Human Body Model on non-bus pins ing additional noise margin or extended cable lengths. +3.0V to +3.6V Operation (3.3V 10%) The receivers include full fail-safe circuitry, guarantee- 300 A Idle Current, 1nA Shutdown Current ing a logic-high receiver output when the receiver Enhanced Receiver Fail-Safe Protection for Open, inputs are open, shorted, or undriven. The receiver Shorted, or Terminated but Idle Data Lines input impedance is at minimum 96k (1/8 unit load), Hot-Swap Glitch Protection on DE and RE Pins allowing up to 256 devices on the bus while preserving the full signal margin. Driver Short Circuit Current Limit and Thermal Shutdown for Overload Protection The drivers are protected by short circuit detection as th 1/8 Unit Load Allows up to 256 Devices on Bus well as thermal shutdown, and maintain high imped- ance in shutdown or when powered off. The XR3070- Industry Standard 8 and 14 NSOIC Packages 75X drivers are slew limited for reduced EMI and error- free communication over long or unterminated data cables. The devices with DE and RE pins include hot swap cir- cuitry to prevent false transitions on the bus during powerup or live insertion, and can enter a 1nA low cur- rent shutdown mode for extreme power savings. The transceivers draw less than 600 A from a +3.3V supply, and typically only 300 A when idling with the receivers active. TYPICAL APPLICATIONS Motor Control RO 1 8 V R CC Security Systems RE 2 7 B Building and Process Automation DE 3 6 A Remote Utility Meter Reading DI 4 5 GND D Energy Monitoring and Control Long or Unterminated Transmission Lines Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com X SER I ES : EXC E LLENC E & R E LI AB ILI T YXR3070-78X LOW POWER 18V TOLERANT RS-485/RS-422 +3.3V TRANSCEIVERS REV. 1.0.0 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. V -0.3V to +7.0V CC Input Voltage at Control and Driver Input (RE, DE, and DI) -0.3V to +7.0V -0.3V to (V + 0.3V) Receiver Output Voltage (RO) CC Driver Output Voltage (A, B, Y and Z) 18V Receiver Input Voltage (A and B, half or full duplex) 18V Transient Voltage Pulse, through 100 70V Driver Output Current 250mA Storage Temperature Range -65C to +150C Lead Temperature (soldering, 10s) +300C Package Power Dissipation 8-Pin SO = 128.4C/W Maximum Junction Temperature = +150C JA 14-Pin SO = 86C/W JA CAUTION: ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed. ORDERING INFORMATION PART NUMBER DUPLEX DATA RATE PACKAGE TEMPERATURE RANGE XR3070XID-F Full 250kbps 14-pin Narrow SOIC -40C to +85C XR3071XID-F Full 250kbps 8-pin Narrow SOIC -40C to +85C XR3072XID-F Half 250kbps 8-pin Narrow SOIC -40C to +85C XR3073XID-F Full 1Mbps 14-pin Narrow SOIC -40C to +85C XR3074XID-F Full 1Mbps 8-pin Narrow SOIC -40C to +85C XR3075XID-F Half 1Mbps 8-pin Narrow SOIC -40C to +85C XR3076XID-F Full 20Mbps 14-pin Narrow SOIC -40C to +85C XR3077XID-F Full 20Mbps 8-pin Narrow SOIC -40C to +85C XR3078XID-F Half 20Mbps 8-pin Narrow SOIC -40C to +85C NOTE: Tape and Reel part numbers are XR30xxXIDTR-F, -F = Green / RoHS Compliant 2