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ISL32601E Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL32601E Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 23 page ISL32600E, ISL32601E, ISL32602E, ISL32603E 11 FN7967.0 June 22, 2012 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 -7V to +12V. 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. The symmetrical ±200mV switching thresholds FIGURE 6A. TEST CIRCUIT FIGURE 6B. MEASUREMENT POINTS FIGURE 6. DRIVER DATA RATE FIGURE 7A. TEST CIRCUIT FIGURE 7B. MEASUREMENT POINTS FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE FIGURE 8A. TEST CIRCUIT FIGURE 8B. MEASUREMENT POINTS FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES Test Circuits and Waveforms (Continued) D DE DI VCC SIGNAL GENERATOR Z Y 50pF VOD - + RDIFF VCC 0V DIFF OUT (Y - Z) +VOD -VOD DI 0V SIGNAL GENERATOR R RO RE A B GND 15pF RO +1V -1V tPLH 0V 0V VCC 0V 50% 50% tPHL A 1k Ω VCC GND SW PARAMETER DE A SW tHZ X +1.5V GND tLZ X -1.5V VCC tZH (Note 10) 0 +1.5V GND tZL (Note 10) 0 -1.5V VCC tZH(SHDN) (Note 13) 0 +1.5V GND tZL(SHDN) (Note 11) 0 -1.5V VCC SIGNAL GENERATOR R RO RE A B GND 15pF RO VCC 0V 50% 50% VOH 0V 1.5V VOH - 0.25V tHZ RO VCC VOL 1.5V VOL + 0.25V tLZ RE OUTPUT HIGH OUTPUT LOW tZL, tZL(SHDN) tZH, tZH(SHDN) NOTE 11 NOTE 11 NOTE 11 |
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