描述 Description

The SP3080E-SP3088E family of RS-485 devices are designed for reliable,bidirectional communication on multipoint bus transmission lines. Eachdevice contains one differential driver and one differential receiver.The SP3082E, SP3085E and SP3088E are half-duplex devices; other partnumbers are full-duplex. All devices comply with TIA/EIA-485 andTIA/EIA-422 standards. Lead-free and RoHS compliant packages areavailable for all models.These devices are ruggedized for use in harsh operating conditions overthe entire common-mode voltage range from -7V to +12V. Receivers arespecially designed to fail-safe to a logic high output state if theinputs are left un-driven or shorted. All RS-485 bus-pins are protectedagainst severe ESD events up to ±15kV (Air-Gap and Human Body Model) andup to ±8kV Contact Discharge (IEC 1000- 4-2). Drivers are protectedfrom excess current flow caused by bus contention or outputshort-circuits by both an internal current limit and a thermal-overloadshutdown. Devices are rated for industrial (-40 to +85oC) operatingtemperatures. Receivers have exceptionally high input impedance, whichplaces only 1/8th the standard load on a shared bus. Up to 256transceivers may coexist while preserving full signal margin.All devices operate from a single 5.0V power supply and draw negligiblequiescent power. All versions except the SP3081E, SP3084E, and SP3087Emay independently enable and disable their driver and receiver and entera low power shutdown mode if both driver and receiver are disabled. Alloutputs maintain high impedance in shutdown or when powered-off.For technical support or help choosing a product please email Exar’s Serial Technical Support group at:?serialtechsupport@exar.com.

特性 Features

·Full Duplex RS485 Transceiver
·5.0V Single Supply Operation
·Slew rate controlled driver, Low EMI
·500kbps data rate
·Receiver failsafe on open, short or terminated lines
·1/8th Unit Load, 256 transceivers on bus
·Hot Swap glitch protection on control inputs
·Driver short circuit current limit and thermal shutdown for overload protection
·Ultra-low 400μA Quiescent Current
·1μA shutdown mode
·Industry standard package footprints
·Robust ESD Specifications:
·±15KV Human Body Model
·±8KV IEC1000-4-2 Contact Discharge

應(yīng)用 Application

Design ToolsTechnical Library·Application Notes