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ISL3150EIBZ-T7A Datasheet(PDF) 22 Page - Renesas Technology Corp |
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ISL3150EIBZ-T7A Datasheet(HTML) 22 Page - Renesas Technology Corp |
22 / 34 page FN6363 Rev.4.00 Page 22 of 34 Apr 19, 2018 ISL3150E, ISL3152E, ISL3153E, ISL3155E, ISL3156E, ISL3158E 6. Application Information accommodate the design of half- and full-duplex systems. Figure 37 shows the cross section and cable parameters of a typical UTP cable. Figure 37. Single Pair STP Cable for RS-485 Applications 6.1.2 Cable Length vs Data Rate RS-485 and RS-422 are intended for network lengths up to 4000ft, but the maximum system data rate decreases as the transmission length increases. Devices operating at 20Mbps are limited to lengths less than 100ft, while the 115kbps versions can operate at full data rates with lengths of several 1000ft. Note that ISL315xE transceivers can cover almost twice the distance of standard compliant RS-485 transceivers. Figure 38. Data Rate vs Cable Length Guidelines in Feet and Meters 6.1.3 Topologies and Stub Lengths RS-485 recommends its nodes to be networked in daisy-chain or backbone topology. In these topologies the participating drivers, receivers, and transceivers connect to a main cable trunk through “short” stubs. A stub being the actual electrical link between transceiver and cable trunk. 22 AWG Tinned Copper Foam High Density Polyethylene Aluminum Foil Polyester Tape Tinned Copper Braid 22 AWG Tinned Copper Drain Wire PVC Jacket Cable: Type: Impedance: DC Resistance: Capacitance: Velocity: Belden 3105A 1-pair, 22AWG PLCT/CM 120Ω 14.7mΩ/ft 11pF/ft 78% (1.3ns/ft) 10000 1000 100 10 10k 100k 1M 10M 100M Data Rate (bps) Standard RS-485 Transceivers ISL315xE Transceivers 10000 1000 100 10 10k 100k 1M 10M 100M Data Rate (bps) Standard RS-485 Transceivers ISL315xE Transceivers |
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