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Enhanced 5V RS485 Devices with Robust Protection

Introducing the new SP3080-3088E 5V RS485 devices with enhanced features such as 15kV ESD protection, 1/8th load receivers, failsafe protection, glitch protected inputs, and thermal overload protection. These devices are available in both half duplex and full duplex architectures.

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Enhanced 5V RS485 Devices with Robust Protection

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  1. SP3080-3088E Enhanced 5V RS485

  2. New 5V RS485 Devices All of these new devices have 15kV ESD protection, 1/8th load receivers, receiver failsafe on open or shorted inputs, glitch protected inputs, and thermal overload protection Company Confidential

  3. Half or Full Duplex Architectures Half Duplex • Half Duplex – Driver outputs connected to Receiver inputs • Small 8-pin package size • Bi-directional bus on a single-pair wire • Most commonly used RS485 architecture • Full Duplex – Independent Driver outputs (AB) & Receiver inputs (XY) • Uses two signal-pairs (plus a ground-return) • One-directional signals, simplified flow control • Maximum throughput per channel • Used for RS422 (V.11) 8-pin SP3082E SP3085E SP3088E Full Duplex 8-pin SP3081E SP3084E SP3087E 14-pin SP3080E SP3083E SP3086E Company Confidential

  4. Robust ESD Protection • Enhanced durability for use in demanding applications • Built-in protection against accidental static discharge • ±15,000 Volt Human Body Model • ±15,000 Volt Air-Gap (IEC61000-4-2) • ±8,000 Volt Contact Discharge (IEC61000-4-2) • Eliminate costly external TVS components ESD Pulse Company Confidential

  5. B A R Enhanced Failsafe Protection • SP3080-3088 include Enhanced Failsafe • Failsafe protection if inputs either open or SHORTED • Protects if there is a termination resistor on the line • Protects if bus-driver is off (tri-state) or loses power • Protects if wires were pinched together, bridged or shorted • Most standard RS485 will only failsafe if the receiver inputs are OPEN • i.e. if the cable is unplugged, inputs floating • Advanced Failsafe guarantees logic 1 if A=B (shorted or open) Company Confidential

  6. SP3080-3088 “1/8th Unit Load” • A standard RS-485 transceiver can drive enough signal to support up to 32 “unit loads” • SP3080-88 devices require only 1/8th the input-signal current of standard RS485 transceivers • Less loading equals more signal margin, better noise rejection • Run with eight times as many transceivers on a multi-drop bus • Support large networks of RS485-connected nodes • Eliminate costly repeaters • 256 maximum instead of 32 • Slew limited SP3080-SP3085 may eliminate line-termination • Possible to support HUNDREDSof nodes per network segment (1/8th) Company Confidential

  7. Optimized for Speed or Distance Communicate reliably over long, noisy lines without complex line-termination 115kbps Slew Limited: SP3080E SP3081E SP3082E 500kbps:SP3083E SP3084E SP3085E Good data rates,Low EMI 20Mbps High Speed:SP3086SP3087 SP3088 Fastest data rates Company Confidential

  8. RS-485 Example: Security Networks • Many nodes, long cable-runs in noisy conditions • Support for high data rates (video) Video Data Control, Pan, Zoom Control and Monitoring AccessPoints Alarms & Sensors Video Surveillance Company Confidential

  9. RS-485 Example: Utilities, Industrial Utility Meters, Instrumentation Valves &Actuators Control-Automation • SP3082E - ideal for long cables & noisy environments • Communicate with hundreds of dispersed nodes • Robust features (ESD, Failsafe, Hot Swap) Remote Monitor Company Confidential

  10. RS-485 Example: Instrumentation • Link a central data-logger to multiple far-away remote stations • 5V low power operation for bus-powered sensors • 115kbps slew limited drivers can run without termination SP3081E WeatherMonitor SP3081E Company Confidential

  11. Feature Comparison * TI parts are only rated HBM; Not IEC rated Company Confidential

  12. Value Proposition • High ESD protection • Up to 256 devices on a bus • Improved failsafe protection • Multiple package options, slew rates, full or half duplex • Glitch-protection on control inputs • Exar has full portfolio of devices in industry standard footprints Company Confidential

  13. Next Steps • Identify potential customers for new SP3080-3088E • New design wins • Steal sockets from Maxim MAX3080E-3088E, Intersil ISL83080E-83088E and ISL3150E-3158E Company Confidential

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