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XR3171EID Datasheet(PDF) 1 Page - Exar Corporation |
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XR3171EID Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 24 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XR3170E-3178E 3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD DECEMBER 2009 REV. 1.0.0 GENERAL DESCRIPTION The XR3170E - XR3178E family of RS-485 devices are designed for reliable, bidirectional communication on multipoint bus transmission lines. Each device contains one differential driver and one differential receiver. XR3172E, XR3175E and XR3178E are half- duplex devices; other part numbers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead free and RoHS compliant packages are available for all models. These devices are ruggedized for use in harsh operating conditions over the entire common-mode voltage range from -7V to +12V. Receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. All RS- 485 bus pins are protected against severe ESD events up to +/-15kV (Air-Gap and Human Body Model) and up to +/-8kV Contact Discharge (IEC 61000-4-2). Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for Industrial (-40 to +85°C) operating temperatures. Receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while preserving full signal margin. All devices operate from a single 3.3V power supply and draw negligible quiescent power. All versions except the XR3171E, XR3174E and XR3177E may independently enable and disable their driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance in shutdown or when powered off. FEATURES • 3.3V Single Supply Operation • High Speed 20Mbps Data Rate • Slew Rate Limited - 250kbps And 500kbps Data Rate • 1/8th Unit Load, 256 Transceivers On Bus • Enhanced Failsafe For Receiver - Open, Short Or Terminated Lines • Robust ESD Protection For RS-485 Pins ■ +/-15kV Air-Gap Discharge ■ +/-15kV Human Body Model ■ +/-8kV Contact Discharge • Hot Swap Glitch Protection • Driver Short Circuit Current Limit And Thermal Shutdown For Overload Protection • Ultra-Low 650uA Quiescent Current • 1µA Shutdown Mode • Industry Standard Package Footprints TYPICAL APPLICATIONS • Motor Control • Building Automation • Security Systems • Remote Utility Meter Reading • Long Or Un-Terminated Transmission Lines FIGURE 1. TYPICAL APPLICATION CIRCUIT RT RT STUB XR3178E XR3178E A AA A B BB B DI RO RE DE DE DE DE RE RE DI DI DI RO RO RO RE |
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