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ISL83082EIBZ Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL83082EIBZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 18 page 10 FN6085.6 September 12, 2005 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. To allow for multipoint operation, the RS-485 spec requires that drivers must handle bus contention without sustaining any damage. 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 ±200mV, as required by the RS-422 and RS-485 specifications. Receiver input resistance of 96k Ω surpasses the RS-422 spec of 4k Ω, and is eight times the RS-485 “Unit Load (UL)” requirement of 12k Ω 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 spec. Receiver inputs function with common mode voltages as great as ±7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages are a realistic concern. All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected (floating) or shorted. FIGURE 5A. TEST CIRCUIT FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER PROPAGATION DELAY AND DATA RATE FIGURE 6A. TEST CIRCUIT FIGURE 6B. MEASUREMENT POINTS FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES Test Circuits and Waveforms (Continued) SIGNAL GENERATOR R RO RE A B 0V 15pF RO +1.5V -1.5V tPLH 0V 0V VCC 0V 1.5V 1.5V tPHL A 1k Ω VCC GND SW PARAMETER DE A SW tHZ 0 +1.5V GND tLZ 0 -1.5V VCC tZH (Note 8) 0 +1.5V GND tZL (Note 8) 0 -1.5V VCC tZH(SHDN) (Note 11) 0 +1.5V GND tZL(SHDN) (Note 11) 0 -1.5V VCC SIGNAL GENERATOR R RO RE A B GND 15pF RO 3V 0V 1.5V 1.5V VOH 0V 1.5V VOH - 0.5V tHZ RO VCC VOL 1.5V VOL + 0.5V tLZ RE OUTPUT HIGH OUTPUT LOW tZL, tZL(SHDN) tZH, tZH(SHDN) NOTE 9 NOTE 9 NOTE 9 ISL83080E, ISL83082E, ISL83083E, ISL83085E, ISL83086E, ISL83088E |
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