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ISL31483EIBZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL31483EIBZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 24 page 1 Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert ISL31480E, ISL31483E, ISL31485E, ISL31486E The ISL3148xE are fault protected, 5V powered differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are protected against faults up to ±60V. Additionally, the extended common mode range allows these transceivers to operate in environments with common mode voltages up to ±25V (>2X the RS-485 requirement), making this RS-485 family one of the most robust on the market. Transmitters deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star network topologies. Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The ISL31483E, ISL31485E and ISL31486E include cable invert functions that reverse the polarity of the Rx and/or Tx bus pins in case the cable is misconnected. Unlike competing devices, Rx full fail-safe operation is maintained even when the Rx input polarity is switched. The ISL31480E and ISL31486E feature a logic supply (VL) pin that sets the VOH of the Rx outputs, and the switching points of the logic input pins, to be compatible with a lower supply voltage (down to 1.8V) in mixed voltage systems. See Table 1 on page 2 for key features and configurations by device number. Features • Fault Protected RS-485 Bus Pins. . . . . . up to ±60V • Extended Common Mode Range . . . . . . . . . . ±25V More Than Twice the Range Required for RS-485 • Cable Invert Pins (Except ISL31480) Corrects for Reversed Cable Connections While Maintaining Rx Full Fail-safe Functionality • Logic Supply (VL) Pin (ISL31480E, ISL31486E) Simplifies Interface to Lower Voltage Logic Devices • Full Fail-safe (Open, Short, Terminated) RS-485 Receivers • 1/4 Unit Load (UL) for up to 128 Devices on the Bus •High Rx IOL for Opto-Couplers in Isolated Designs • Hot Plug Circuitry - Tx and Rx Outputs Remain Three-State During Power-up/Power-down • Slew Rate Limited RS-485 Data Rate . . . . . . 1Mbps • Low Quiescent Supply Current . . . . . . . . . . . 2.3mA Ultra Low Shutdown Supply Current . . . . . . . . 10µA Applications*(see page 19) • Utility Meters/Automated Meter Reading Systems • High Node Count Systems • PROFIBUS® and Field Bus Networks, and Factory Automation • Security Camera Networks • Building Lighting and Environmental Control Systems • Industrial/Process Control Networks Exceptional Rx Operates at 1Mbps Even With ±25V Common Mode Voltage Transceivers Deliver Superior Common Mode Range vs. Standard RS-485 Devices -5 0 5 10 15 20 25 30 TIME (400ns/DIV) B VID = ±1V A RO ISL3148XE CLOSEST COMPETITOR STANDARD RS-485 TRANSCEIVER -25 -20 -12 -7 0 12 25 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. June 25, 2010 FN7638.0 |
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