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ISL32485EIBZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL32485EIBZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 17 page 1 Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert and ±16.5kV ESD ISL32483E, ISL32485E The ISL3248xE 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 fault protected up to ±60V and are protected against ±16.5kV ESD strikes without latch-up. 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 fault-protected RS-485 family one of the most robust on the market. Transmitters (Tx) 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 ISL32483E and ISL32485E 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. For fault protected RS-485 transceivers without the cable invert function, please see the ISL32470E and ISL32490E data sheets. Features • Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V • Extended Common Mode Range . . . . . . . . . . . . . . . . . . . ±25V More Than Twice the Range Required for RS-485 • ±16.5kV HBM ESD Protection on RS-485 Bus Pins •Cable Invert Pins Corrects for Reversed Cable Connections While Maintaining Rx Full Fail-Safe Functionality • 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 • Utility Meters/Automated Meter Reading Systems • High Node Count RS-485 Systems •PROFIBUS® and RS-485 Based Field Bus Networks, and Factory Automation •Security Camera Networks • Building Lighting and Environmental Control Systems • Industrial/Process Control Networks FIGURE 1. EXCEPTIONAL Rx OPERATES AT 1Mbps EVEN WITH ±25V COMMON MODE VOLTAGE FIGURE 2. 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 ISL3248XE CLOSEST COMPETITOR STANDARD RS-485 TRANSCEIVER -25 -20 -12 -7 0 12 25 January 18, 2011 FN7785.0 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. |
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