SP3080E-3088E Advanced-Failsafe RS-485/RS-422 Transceivers /8th Unit Load, Slew-Rate Limited, 5kV ESD-Protected FEATURES 5.0V single supply operation Vcc RO Receiver failsafe on open, shorted or terminated lines 8 8 PIN NSOIC /8th Unit Load, 256 transceivers on bus RE B 2 7 SP3082E Robust ESD protection for RS-485 pins SP3085E DE 6 A 3 SP3088E o 5kV Air-Gap Discharge GND DI 5 4 Half Duplex o 5kV Human Body Model o 8kV Contact Discharge Controlled driver slew rates Vcc A 8 o 5kbps, Low EMI (SP3080E, SP308 E, SP3082E) 8 PIN NSOIC o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E) RO 2 B 7 SP308 E SP3084E o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E) DI 3 6 Z SP3087E Hot Swap glitch protection on control inputs GND Y 4 5 Full Duplex Driver short circuit current limit and thermal shutdown for overload protection Ultra-low 400A quiescent current NC 4 Vcc 1A shutdown mode (except SP3081E, SP3084E, SP3087E) RO 2 3 NC 4 PIN NSOIC Industry standard package footprints RE A 3 2 SP3080E SP3083E DE 4 B APPLICATIONS SP3086E DI 0 Z 5 GND 6 9 Y Full Duplex Motor Control NC GND 7 8 Building Automation Security Systems Remote Meter Reading Long or un-terminated transmission lines DESCRIPTION The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional commu- nication on multipoint bus transmission lines. Each device contains one differential driver and one differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices other part num- bers 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 + 2V. 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 5kV (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 in- dustrial (-40 to +85C) operating temperatures. Receivers have exceptionally high input impedance, which places only /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 5.0V power supply and draw negligible quiescent power. All ver- sions except the SP308 E, SP3084E, and SP3087E 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. Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP3080E-SP3088E 0 0826 DEVICE ARCHITECTURE AND BLOCK DIAGRAMS Devices are available in three industry standard architectures and footprints. In each footprint there are three speed grades available. 14 1 VCC NC 13 NC 4-Pin Full Duplex 12 A 2 R RO SP3080E, 5kbps slew rate limited 11 B SP3083E, 500kbps slew rate limited 3 RE SP3086E, 20Mbps 4 DE 10 Z 5 DI D 9 6 Y GND 8 7 NC GND 8-Pin Full Duplex 1 VCC 8 SP308E, 5kbps slew rate limited A 2 RO R 7 SP3084E, 500kbps slew rate limited B SP3087E, 20Mbps 6 Z 3 DI D 5 4 Y GND 8-Pin Half Duplex 8 VCC 1 SP3082E, 5kbps slew rate limited RO R SP3085E, 500kbps slew rate limited 2 7 RE B SP3088E, 20Mbps 3 6 DE A 4 DI D 5 GND Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP3080E-SP3088E 0 0826 2