The SN65LBC171 and SN75LBC171 are monolithic integrated circuits designed for bidirectional data communication on multipoint bus-transmission lines. Potential applications include serial or parallel data transmission, cabled peripheral buses with twin axial, ribbon, or twisted-pair cabling. These devices are suitable for FAST-20 SCSI and can transmit or receive data pulses as short as 25 ns, with skew less than 3 ns.

These devices combine three 3-state differential line drivers and three differential input line receivers, all of which operate from a single 5-V power supply.

The driver differential outputs and the receiver differential inputs are connected internally to form three differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. These ports feature a wide common-mode voltage range making the device suitable for party-line applications over long cable runs.

The SN75LBC171 is characterized for operation over the temperature range of 0°C to 70°C. The SN65LBC171 is characterized for operation over the temperature range of -40°C to 85°C.

• Three Differential Transceivers in One Package
• Signaling Rates1 Up to 30 Mbps
• Low Power and High Speed
• Designed for TIA/EIA-485, TIA/EIA-422, ISO 8482, and ANSI X3.277 (HVD SCSI Fast-20) Applications
• Common-Mode Bus Voltage Range -7Vto12 V
• ESD Protection on Bus Terminals Exceeds12 kV
• Driver Output Current up to ± 60 mA
• Thermal Shutdown Protection
• Driver Positive and Negative Current Limiting
• Power-Up, Power-Down Glitch-Free Operation
• Pin-Compatible With the SN75ALS171
• Available in Shrink Small-Outline Package

1The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).