DATASHEET ISL32610E, ISL32611E, ISL32612E FN7869 Rev.2.00 16.5kV ESD Protected, 1.8V, Micro Power, +125C, 1/8 Unit Load, Sep 26, 2019 RS-485/RS-422 Differential Receivers The ISL32610E, ISL32611E, ISL32612E are 16.5kV Features IEC61000 ESD protected, fractional unit load (UL), 1.8V Wide Supply Voltage Range . 1.8V to 3.6V powered, single differential receivers (Rx) for balanced data communication using the RS-485 and RS-422 standards. With Ultra Low Quiescent Supply Current 110A (maximum) their 85A supply currents, the receivers are optimized for low IEC61000 ESD Protection on RS-485 Bus Pins 16.5kV power applications, and deliver the lowest supply currents of - Class 3 ESD Level on all Other Pins >8kV HBM any available single Rx IC (see Figure 1). Symmetrical Switching Thresholds for Less Duty Cycle To improve performance in low data rate applications with Distortion (see Figure 2) slow signal transitions, these Rx feature symmetrical switching points (200mV) and increased hysteresis. The symmetrical Larger Hysteresis for Improved Noise Immunity . 70mV switching points eliminate the duty cycle distortion introduced Data Rates up to 256kbps (1.8V) or 500kbps (3.3V) by full-failsafe type receivers (see Figure 2), while the larger 1/8 Unit Load Allows up to 256 Devices on the RS-485 Bus hysteresis increases noise immunity. Specified for +125C Operation The receivers present a 1/8 unit load to the data bus, which Three-State Rx Output Available allows up to 256 devices on the network for large node count systems (for example, process automation, remote meter 5V tolerant logic inputs reading systems). The ISL32611E/ISL32612E Rx output is Pb-Free (RoHS Compliant) tri-statable using the RE/RE input. The receiver inputs feature a failsafe-if-open design, which Applications ensures a logic high Rx output if Rx inputs are floating. Data Industrial/Process Control Networks, Factory Automation rates up to 256kbps are achievable with this device at High Node Count Networks V =1.8V. CC Space Constrained Systems See Table 1 for a summary of each devices features. For a companion 1.8V differential transmitter in a SOT-23 package, Building Environmental Control Systems reference the ISL32613E datasheet. Related Literature For a full list of related documents, visit our website: ISL32610E, ISL32611E, and ISL32612E device pages 500 1 450 A-B DYNAMIC (256kbps) 400 0 350 ISL3282E -1 300 STATIC 4 250 ISL3261XE 200 0 150 4 DYNAMIC (256kbps) 100 ISL3282E ISL3261XE 0 STATIC V = 3.3V, DATA RATE = 125kbps CC 50 TIME (4s/DIV) 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 V (V) CC FIGURE 2. COMPARED WITH A FULL-FAILSAFE RECEIVER, THE FIGURE 1. ISL3261XE REDUCES OPERATING I BY A FACTOR OF 4 CC SYMMETRICAL RX THRESHOLDS OF THE ISL3261XE FROM PREVIOUS GENERATION RECEIVER ICs, AND DELIVER LESS OUTPUT DUTY CYCLE DISTORTION WHEN OPERATES WITH SUPPLY VOLTAGES AS LOW AS 1.8V DRIVEN WITH SLOW INPUT SIGNALS FN7869 Rev.2.00 Page 1 of 13 Sep 26, 2019 I (A) CC RECEIVER OUTPUT (V) RECEIVER INPUT (V)ISL32610E, ISL32611E, ISL32612E Typical Operating Circuits 1.8V 1.8V 100nF 100nF 1 2 1k V V CC CC A 5 6 Y 3 RO DI 1 B 4 4 Z DE 3 GND GND 2 5 ISL32610E ISL32613E FIGURE 3. POINT-TO-POINT LINK WITH FIXED ENABLE-PINS 1.8V 1.8V 100nF 100nF 1 2 10k V V CC 5.6k CC A 6 6 Y 3 RO DI 1 5 RE B 4 4 Z DE 3 5.6k GND GND 2 5 ISL32611E ISL32613E FIGURE 4. POINT-TO-POINT LINK WITH PROGRAMMABLE ENABLE-PINS FN7869 Rev.2.00 Page 2 of 13 Sep 26, 2019