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ISL32470E Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL32470E Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 19 page 1 Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers with ±16.5kV ESD ISL32470E, ISL32472E, ISL32475E, ISL32478E The ISL32470E, ISL32472E, ISL32475E, ISL32478E 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 fault protected against overvoltages up to ±60V and are protected against ±16.5kV ESD strikes without latch-up. Additionally, these transceivers operate in environments with common mode voltages up to ±15V (exceeds the RS-485 requirement), making this fault-protected RS-485 family one of the more 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 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 a fault-protected RS-485 transceiver with a ±25V extended common mode range, please see the ISL32490E and ISL32483E 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 • ±16.5kV HBM ESD Protection on RS-485 Bus Pins • 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 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 >15Mbps EVEN WITH ±15V COMMON MODE VOLTAGE FIGURE 2. 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 ISL3247xE STANDARD RS-485 TRANSCEIVER -15 -7 0 12 15 January 21, 2011 FN7784.0 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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