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ISL3280EIHZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL3280EIHZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 16 page ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E 8 FN6543.4 July 27, 2015 Submit Document Feedback Application Information RS-485 and RS-422 are differential (balanced) data transmission standards for use in long haul or noisy environments. RS-422 is a subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a point-to-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. Another important advantage of RS-485 is the extended Common Mode Range (CMR), which specifies that the driver outputs and receiver inputs withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000’, so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. Receiver Features These devices utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is better than ±200mV, as required by the RS-422 and RS-485 specifications. Receiver input resistance of 96kΩ surpasses the RS-422 specification of 4kΩ and is eight times the RS-485 “Unit Load (UL)” requirement of 12kΩ minimum. Thus, these products are known as “one-eighth UL” transceivers and there can be up to 256 of these devices on a network while still complying with the RS-485 loading specification. Receiver inputs function with common mode voltages as great as +9V/-7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages and ground potential differences are realistic concerns. Test Circuits and Waveforms FIGURE 4A. TEST CIRCUIT FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RECEIVER PROPAGATION DELAY AND DATA RATE FIGURE 5A. TEST CIRCUIT FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES (EXCEPT ISL3280E AND ISL3284E) SIGNAL GENERATORS R RO RE A B GND 15pF RE VCC RO +1V -1V tPLH 0V 0V VCC OR VL 0V 50% 50% tPHL A B 1kΩ VCC OR VL GND SW PARAMETER A SW tHZ +1.5V GND tLZ -1.5V VCC OR VL tZH +1.5V GND tZL -1.5V VCC OR VL SIGNAL GENERATOR R RO RE OR RE A B GND 15pF RO 3V 0V 1.5V 1.5V VOH 0V 50% VOH - 0.25V tHZ RO VCC OR VL VOL 50% VOL + 0.25V tLZ RE OUTPUT HIGH OUTPUT LOW tZL tZH (INVERT FOR RE) |
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