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LMS485EIMX Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMS485EIMX Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 13 page LMS485E Low Power RS-485 / RS-422 Differential Bus Transceiver General Description The LMS485E is a low power differential bus/line transceiver designed for high speed bidirectional data communication 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 LMS485E combines a TRI- STATE™ differential line driver and differential input receiver, 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 receiver 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 common mode voltage ranges, making the device suitable for multipoint applications in noisy environments. The LMS485E is avail- able in 8-Pin SOIC and 8-pin DIP packages. It is a drop-in replacement to Maxim’s MAX485E. 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 800µA (max) n Allows up to 32 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 MAX485E 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 20086601 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 DS200866 www.national.com |
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