LMS1487E Datasheet | National Semiconductor

Description The LMS1487E is a low power differential bus/line transceiver designed for high speed bidirectional data munication 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 remendation and V.11 and X.27. The driver outputs and receiver inputs have ±15k V ESD protection. The LMS1487E bines 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 VCC = 0V. These ports feature wide positive and negative 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 packages. 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 A typical multipoint...