The SN65LBC180 and SN75LBC180 differentialdriver and receiver pairs are monolithic integratedcircuits designed for bidirectional datacommunication over long cables that take on thecharacteristics of transmission lines. They arebalanced, or differential, voltage mode devicesthat meet or exceed the requirements of industrystandards ANSI RS-485 and ISO 8482:1987(E).Both devices are designed using TI’s proprietaryLinBiCMOS with the low power consumption ofCMOS and the precision and robustness ofbipolar transistors in the same circuit.Both the SN65LBC180 and SN75LBC180combine a differential line driver and receiver with3-state outputs and operate from a single 5-Vsupply. The driver and receiver have active-highand active-low enables, respectively, which canbe externally connected to function as a directioncontrol. The driver differential outputs and thereceiver differential inputs are connected toseparate terminals for full-duplex operation andare designed to present minimum loading to thebus whether disabled or powered off (VCC = 0).These parts feature a wide common-modevoltage range making them suitable forpoint-to-point or multipoint data-bus applications
