Differential Bus Transceivers

The SN65LBC176A, SN65LBC176AQ, and

SN75LBC176A differential bus transceivers are monolithic, integrated circuits

designed for bidirectional data communication on multipoint bus-transmission lines.

They are designed for balanced transmission lines and are compatible with ANSI

standard TIA/EIA-485-A and ISO 8482. The A version offers improved switching

performance over its predecessors without sacrificing significantly more power.

The SN65LBC176A, SN65LBC176AQ, and

SN75LBC176A combine a 3-state, differential line driver and a differential input

line receiver, both of which operate from a single 5-V power supply. The driver and

receiver have active-high and active-low enables, respectively, which can externally

connect together to function as a direction control. The driver differential outputs

and the receiver differential inputs connect internally to form a differential input

/output (I/O) bus port that is designed to offer minimum loading to the bus whenever

the driver is disabled or VCC = 0. This port features wide positive and

negative common-mode voltage ranges, making the device suitable for party-line

applications. Very low device supply current can be achieved by disabling the driver

and the receiver.