DATASHEET ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E FN7921 60V Fault Protected, 3.3V to 5V, 20V Common-Mode Range, RS-485/RS-422 Rev.3.00 Transceivers with Cable Invert and 15kV ESD Feb 14, 2019 The ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, Features ISL32458E, and ISL32459E are 3.3V to 5V powered, fault Fault protected RS-485 bus pins up to 60V protected, extended Common-Mode Range (CMR) differential transceivers for balanced communication. The RS-485 bus Extended common-mode range 20V pins (driver outputs and receiver inputs) are protected against larger than required for RS-485 overvoltages up to 60V, and against 15kV ESD strikes. 15kV HBM ESD protection on RS-485 bus pins These transceivers operate in environments with Wide supply range 3V to 5.5V common-mode voltages up to 20V (exceeds the RS-485 requirement), making this RS-485 family one of the most Cable invert pin (ISL32457E and ISL32459E only) robust on the market. corrects for reversed cable connections while maintaining Rx full fail-safe functionality The transmitters are RS-485 compliant with V 4.5V and CC deliver a 1.1V differential output voltage into the RS-485 1/4 unit load for up to 128 devices on the bus specified 54 load even with V = 3V. The receiver (Rx) inputs CC High transient overvoltage tolerance 80V feature a full fail-safe design that ensures a logic-high Rx output Full fail-safe (open, short, terminated) RS-485 receivers if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The Rx full fail-safe operation is maintained Choice of RS-485 data rates up to 20Mbps even when the Rx input polarity is switched (cable invert Low quiescent supply current . 2.1mA function on ISL32457E and ISL32459E). The ISL32457E and ISL32459E include a cable invert function Applications that reverses the polarity of the Rx and Tx bus pins in case the Utility meters and automated meter reading systems cable is misconnected during installation. Air conditioning systems See Table 1 on page 4 for key features and configurations by Security camera networks device number. Building lighting and environmental control systems Related Literature Industrial and process control networks ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, and ISL32459E device pages 20 V = 3V CC A 20 12 B VID = 1V 2Mbps 15 0 10 -7 5 RO 0 -20 STANDARD RS-485 ISL3245XE TIME (200ns/DIV) TRANSCEIVER FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON-MODE EVEN WITH 20V COMMON-MODE VOLTAGE RANGE vs STANDARD RS-485 DEVICES FN7921 Rev.3.00 Page 1 of 25 Feb 14, 2019 VOLTAGE (V) COMMON-MODE RANGE (V)ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E Typical Operating Circuits +3.3V +3.3V + + 0.1F 0.1F 14 14 V CC V CC R 9 A 12 T Y 2 DI 5 RO R 11 10 B Z D 3 RE DE 4 4 DE 3 RE R 10 11 Z T B 5 DI RO 2 9 R D Y 12 A GND GND 6, 7 6, 7 SOIC PINOUT SHOWN FIGURE 3. ISL32450E, ISL32453E FULL DUPLEX NETWORK +3.3V +3.3V + + 8 0.1F 8 0.1F V CC V CC RO 1 DI 4 R D 2 RE R R 3 B/Z 7 T T 7 B/Z DE 6 3 DE A/Y 6 A/Y 2 RE DI 4 1 RO D R GND GND 5 5 FIGURE 4. ISL32452E, ISL32455E, ISL32458E HALF DUPLEX NETWORK +3.3V +3.3V + + 0.1F 0.1F 8 8 V V CC CC 2 INV RO RO 1 1 R R R R A/Y 7 B/Z 6 T T A/Y B/Z 7 6 DE 3 3 DE DI DI 4 4 D D 2 THE IC ON THE LEFT HAS THE CABLE CONNECTIONS INV GND GND SWAPPED, SO THE INV PIN IS STRAPPED HIGH TO 5 5 INVERT THE RX AND TX POLARITY FIGURE 5. ISL32457E, ISL32459E HALF DUPLEX NETWORK USING CABLE INVERT FUNCTION FN7921 Rev.3.00 Page 2 of 25 Feb 14, 2019