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ISL32495EIBZ Folha de dados(PDF) 11 Page - Intersil Corporation |
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ISL32495EIBZ Folha de dados(HTML) 11 Page - Intersil Corporation |
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11 / 21 page  ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E 11 FN7786.0 January 18, 2011 Application Information RS-485 and RS-422 are differential (balanced) data transmission standards used for 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 specification 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 feet; thus, the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. The ISL3249xE is a family of ruggedized RS-485 transceivers that improves on the RS-485 basic requirements and thereby 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 CD VOD + - 54Ω 3V 0V DIFF OUT (Y - Z) +VOD -VOD DI 0V SIGNAL GENERATOR R RO RE A B 15pF SIGNAL GENERATOR VCM RO VCM + 750mV VCM - 750mV tPLH VCM VCM VCC 0V 50% 50% tPHL A B 1kΩ VCC GND SW PARAMETER DE A SW tHZ 0 +1.5V GND tLZ 0 -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 13) 0 -1.5V VCC SIGNAL GENERATOR R RO RE A B 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 LOW tZL, tZL(SHDN) tZH, tZH(SHDN) (Note 11) (Note 11) (Note 11) OUTPUT HIGH |
Nº de peça semelhante - ISL32495EIBZ |
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Descrição semelhante - ISL32495EIBZ |
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