LMS75ALS176A Datasheet | National Semiconductor

Description The LMS75ALS176A is a differential bus/line transceiver designed for 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 V.11 and X.27. The LMS75ALS176A 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 enable, respectively, that can be externally connected to function as a direction control. The driver and receiver differential inputs are internally connected to form differential input/output (I/O) bus ports that are 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 LMS75ALS176A is available in a 8-Pin SOIC package. It is a drop-in socket replacement to TI’s SN75ALS176A. Features n Bidirectional transceiver n Meet ANSI standard RS-485-A and RS-422-B n Low skew, 2ns n Low supply current, 8m A (max.) n Wide input and output voltage range n High output drive capacity ±60m A n Thermal shutdown protection n Open circuit fail-safe for receiver n Receiver input sensitivity ±200m V n Receiver input hysteresis 10m V (min.) n Single supply voltage operation, 5V n Glitch free power-up and power-down operation n Data rates up to 35 Mbaud n Pin and functional patible with TI’s SN75ALS176A n 8-Pin SOIC Applications n Network hubs, bridges, and routers n Point of sales equipment (ATM, barcode readers,…) n Industrial programmable logic controllers n High speed parallel and serial applications n Multipoint applications with noisy environment Typical Application A Typical multipoint application is shown in the above figure. Terminating resistors, RT, are typically required but only located at...