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
–7 V to 12 V
ESD Protection on Bus Terminals
Exceeds 12 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

description
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.