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ISL31472EIPZ Arkusz danych(PDF) 1 Page - Intersil Corporation |
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ISL31472EIPZ Arkusz danych(HTML) 1 Page - Intersil Corporation |
1 / 21 page 1 Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers ISL31470E, ISL31472E, ISL31475E, ISL31478E The ISL31470E, ISL31472E, ISL31475E, ISL31478E are fault protected, extended common mode range differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ±60V. Additionally, these transceivers operate in environments with common mode voltages up to ±15V (exceeds the RS-485 requirement), making this RS-485 family one of the more 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 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. Rx outputs feature high drive levels - typically 15mA @ VOL = 1V (to ease the design of opto-coupled isolated interfaces). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 2 for key features and configurations by device number. For an RS-485 family with a ±25V extended common mode range, please see the ISL31490E and ISL31480E data sheets. Features • Fault Protected RS-485 Bus Pins. . . . . . .up to ±60V • Extended Common Mode Range . . . . . . . . . . .±15V Larger Than Required for RS-485 • 1/4 Unit Load for up to 128 Devices on the Bus • High Transient Over Voltage Tolerance . . . . . . ±80V • Full Fail-safe (Open, Short, Terminated) RS-485 Receivers • High Rx IOL for Opto-Couplers in Isolated Designs • Hot Plug Circuitry - Tx and Rx Outputs Remain Three-State During Power-up/Power-down • Choice of RS-485 Data Rates . . . .250kbps to 15Mbps • Low Quiescent Supply Current . . . . . . . . . . 2.3mA Ultra Low Shutdown Supply Current . . . . . . . 10μA • Pb-Free (RoHS Compliant) Applications • 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 >15Mbps Even with ±15V Common Mode Voltage Transceivers Deliver Superior Common Mode Range vs Standard RS-485 Devices TIME (20ns/DIV) -5 0 5 10 15 20 B VID = ±1V A RO ISL3147xE STANDARD RS-485 TRANSCEIVER -15 -7 0 12 15 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 17, 2010 FN7639.0 |
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