Three Differential Transceivers in One

Package

Signaling Rates† 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 SN75ALS170

Available in Shrink Small-Outline Package

description

The SN65LBC170 and SN75LBC170 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.