1 Features

? Qualified for automotive applications

? Bidirectional transceiver

? Meet or exceed the requirements of ANSI standard

RS-485 and ISO 8482:1987(E)

? High-speed low-power LinBiCMOS circuitry

? Designed for high-speed operation in both serial

and parallel applications

? Low skew

? Designed for multipoint transmission on long bus

lines in noisy environments

? Very low disabled supply-current requirements:

200 μA maximum

? Wide positive and negative input/output bus

voltage ranges

? Driver Output Capacity: ±60 mA

? Thermal-Shutdown Protection

? Driver positive-and negative-current limiting

? Open-Circuit Fail-Safe Receiver Design

? Receiver input sensitivity: ±200 mV max

? Receiver input hysteresis: 50 mV typical

? Operate from a single 5-V supply

? Glitch-free power-up and power-down protection

2 Description

The SN65LBC176 differential bus transceiver is a

monolithic, integrated circuit designed for bidirectional

data communication on multipoint bus-transmission

lines. It is designed for balanced transmission

lines and meets ANSI Standard RS-485 and ISO

8482:1987(E).

The SN65LBC176 combines 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. Both the driver

and receiver are available as cells in the Texas

Instruments LinASIC Library.

This transceiver is suitable for ANSI Standard RS-485

and ISO 8482:1987 (E) applications to the extent

that they are specified in the operating conditions

and characteristics section of this data sheet. Certain

limits contained in the ANSI Standard RS-485 and

ISO 8482:1987 (E) are not met or cannot be tested

over the entire extended temperature range.