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ISL32453E Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL32453E Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 21 page 1 ±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ±15kV ESD ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E The ISL32450E through ISL32457E are 3.3V to 5V powered, fault protected, extended common mode range differential transceivers for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ±60V, and against ±15kV ESD strikes. These transceivers operate in environments with common mode voltages up to ±20V (exceeds the RS-485 requirement), making this RS-485 family one of the more robust on the market. Transmitters are RS-485 compliant with VCC ≥ 4.5V and deliver a 1.1V differential output voltage into the RS-485 specified 54Ω load even with VCC =3V. 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 full fail-safe operation is maintained even when the Rx input polarity is switched (cable invert function on ISL32457E). The ISL32457E includes a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation. See Table 1 on page 2 for key features and configurations by device number. Related Literature •See FN7784, “ISL32470E, ISL32472E, ISL32475E, ISL32478E: Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers with ±16.5kV ESD” Features • Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V • Extended Common Mode Range . . . . . . . . . . . . . . . . . . . ±20V Larger Than Required for RS-485 • ±15kV HBM ESD Protection on RS-485 Bus Pins • Wide Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V • Cable Invert Pin (ISL32457E Only) Corrects for Reversed Cable Connections While Maintaining Rx Full Fail-safe Functionality • 1/4 Unit Load for Up to 128 Devices on the Bus • High Transient Overvoltage Tolerance . . . . . . . . . . . . . . . ±80V • Full Fail-safe (Open, Short, Terminated) RS-485 Receivers • Choice of RS-485 Data Rates . . . . . . . . . . . . 250kbps or 1Mbps • Low Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 2.1mA Ultra Low Shutdown Supply Current . . . . . . . . . . . . . . . 10µA • Pb-Free (RoHS Compliant) Applications • Utility Meters/Automated Meter Reading Systems • Air Conditioning Systems •Security Camera Networks • Building Lighting and Environmental Control Systems • Industrial/Process Control Networks FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps EVEN WITH ±20V COMMON MODE VOLTAGE FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE RANGE vs STANDARD RS-485 DEVICES TIME (200ns/DIV) 0 5 10 15 20 B A RO VCC = 3V VID = ±1V 2Mbps ISL3245XE STANDARD RS-485 TRANSCEIVER -20 -7 0 12 20 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. 2012. 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. February 20, 2012 FN7921.0 |
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