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LMS1487ECMX Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMS1487ECMX Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 13 page LMS1487E Low Power RS-485 / RS-422 Differential Bus Transceiver General Description The LMS1487E is a low power differential bus/line trans- ceiver designed for high speed bidirectional data communi- cation on multipoint bus transmission lines. It is designed for balanced transmission lines. It meets ANSI Standards TIA/ EIA RS422-B, TIA/EIA RS485-A and ITU recommendation and V.11 and X.27. The driver outputs and receiver inputs have ±15kV ESD protection. The LMS1487E combines a TRI-STATE™ differential line driver and differential input re- ceiver, both of which operate from a single 5.0V power supply. The driver and receiver have an active high and active low, respectively, that can be externally connected to function as a direction control. The driver outputs and re- ceiver inputs are internally connected to form a differential input/output (I/O) bus port that is designed to offer minimum loading to bus whenever the driver is disabled or when V CC = 0V. These ports feature wide positive and negative com- mon mode voltage ranges, making the device suitable for multipoint applications in noisy environments. The LMS1487E is available in 8-Pin SOIC and 8-pin DIP pack- ages. It is a drop-in replacement to Maxim’s MAX1487E. Features n Meet ANSI standard RS-485 and RS-422 n Data rate 2.5 Mbps n Single supply voltage operation, 5V n Wide input and output voltage range n Thermal shutdown protection n Short circuit protection n Low quiescent current 660µA (max) n Allows up to 128 transceivers on the bus n Open circuit fail-safe for receiver n Extended operating temperature range −40˚C to 85˚C n Drop-in replacement to MAX1487E n Available in 8-pin SOIC and 8-pin DIP packages Applications n Low power RS-485 systems n Network hubs, bridges, and routers n Point of sales equipment (ATM, barcode scanners,…) n Local area networks (LAN) n Integrated service digital network (ISDN) n Industrial programmable logic controllers n High speed parallel and serial applications n Multipoint applications with noisy environment Typical Application 20085601 A typical multipoint application is shown in the above figure. Terminating resistor, RT are typically required but only located at the two ends of the cable. Pull-up and pull-down resistors maybe required at the end of the bus to provide fail-safe biasing. The biasing resistors provide a bias to the cable when all drivers are in TRI-STATE, See National Application Note, AN-847 for further information. November 2003 © 2003 National Semiconductor Corporation DS200856 www.national.com |
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