Part # LMS75LBC176 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMS75LBC176 Differential Bus Transceivers


Part Details:

LMS75LBC176 April 2003 LMS75LBC176Differential Bus Transceivers Differential General Description Features The LMS75LBC176 is a differential bus/line transceiver de- n Bidirectional transceiver signed for bidirectional data communication on multipoint n Meet ANSI standard RS-485 bus transmission lines. It is designed for balanced transmis- n Low skew, 6ns sion lines. It meets TIA/EIA RS485 and ISO 8482:1987(E). n Low supply current, 8mA (max) The LMS75LBC176 combines a TRI-STATETM differential n Wide input and output voltage range line driver and differential input receiver, both of which oper- n High output drive capacity ±60mA ate from a single 5.0V power supply. The driver and receiver Bus have an active high and active low enable, respectively, that n Thermal shutdown protection can be externally connected to function as a direction con- n Open circuit fail-safe for receiver trol. The driver and receiver differential inputs are internally n Receiver input sensitivity ±200mV T connected to form differential input/output (I/O) bus ports n Receiver input hysteresis 10mV (min.) ransceivers that are designed to offer minimum loading to bus whenever n Single supply voltage operation, 5V the driver is disabled or when V = 0V. These ports feature CC n Glitch free power-up and power-down operation wide positive and negative common mode voltage ranges, n Pin and functional compatible with TI s SN75LBC176 making the device suitable for multipoint applications in n 8-Pin SOIC noisy environments. The LMS75LBC176 is available in a8-Pin SOIC package. It is a drop-in socket replacement to Applications TI s SN75LBC176. 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 20047901 A typical multipoint application is shown in the above figure. Terminating resistors, 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 failsafe biasing. The biasing resistors provide a bias to the cable when alldrivers are in TRI-STATE, See National Application Note, AN-847 for further information. © 2003 National Semiconductor Corporation DS200479 www.national.com


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LMS75LBC176.pdf Datasheet