LMS485E Datasheet | National Semiconductor

Description The LMS485E 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 LMS485E bines a TRISTATE™ 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 LMS485E is available in 8-Pin SOIC and 8-pin DIP packages. It is a drop-in replacement to Maxim’s MAX485E. Features n n n n n n n n n n n n Meet ANSI standard RS-485 and RS-422 Data rate 2.5 Mbps Single supply voltage operation, 5V Wide input and output voltage range Thermal shutdown protection Short circuit protection Low quiescent current 800µA (max) Allows up to 32 transceivers on the bus Open circuit fail-safe for receiver Extended operating temperature range - 40˚C to 85˚C Drop-in replacement to MAX485E Available in 8-pin SOIC and 8-pin DIP packages Applications n n n n n n n n Low power RS-485 systems Network hubs, bridges, and routers Point of sales equipment (ATM, barcode scanners,…) Local area networks (LAN) Integrated service digital network (ISDN) Industrial programmable logic controllers High speed parallel and serial applications Multipoint applications with noisy environment Typical Application A typical multipoint application...