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MAX481C Datasheet(PDF) 13 Page - Maxim Integrated Products |
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MAX481C Datasheet(HTML) 13 Page - Maxim Integrated Products |
13 / 19 page Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 23. Figures 19 and 20 show the system differential voltage for the parts driving 4000 feet of 26AWG twisted-pair wire at 110kHz into 120Ω loads. Typical Applications The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 21 and 22 show typical network applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 23. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possi- ble. The slew-rate-limited MAX483 and MAX487–MAX489 are more tolerant of imperfect termination. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers ______________________________________________________________________________________ 13 DI VY-VZ RO 5V 0V 1V 0V -1V 5V 0V 2µs/div DI VY-VZ RO 5V 0V 1V 0V -1V 5V 0V 2µs/div DI RO DE RE A B RE RE RE RO RO RO DI DI DI DE DE DE D D D R R R BB B A A A 120Ω 120Ω D R MAX481 MAX483 MAX485 MAX487 MAX1487 Figure 19. MAX481/MAX485/MAX490/MAX491/MAX1487 System Differential Voltage at 110kHz Driving 4000ft of Cable Figure 20. MAX483, MAX487–MAX489 System Differential Voltage at 110kHz Driving 4000ft of Cable Figure 21. MAX481/MAX483/MAX485/MAX487/MAX1487 Typical Half-Duplex RS-485 Network |
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