1 Features

• Meets or exceeds the requirements of

TIA/EIA-422-B, TIA/EIA-485-A, and ITU

recommendations V.11 and X.27

• Operates at data rates up to 35 MBaud

• Operating temperature range: –25°C to 85°C

• Designed for multipoint transmission on long bus

lines in noisy environments

• Low supply-current requirement: 30 mA max

• Wide positive and negative input/output busvoltage

ranges

• Thermal-shutdown protection

• Driver positive- and negative-current limiting

• Receiver input hysteresis

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

• Receiver open-circuit fail-safe design

• Package options include plastic small-outline (D)

package and (P) DIPs

2 Applications

• PROFIBUS

3 Description

The SN65ALS1176 differential bus transceiver is

designed for bidirectional data communication on

multipoint bus transmission lines. The device is

designed for balanced transmission lines and

meets TIA/EIA-422-B, TIA/EIA-485-A, and ITU

Recommendations V.11 and X.27.

The SN65ALS1176 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, that can be connected together

externally to function as a direction control. The driver

differential outputs and the receiver differential inputs

are connected internally to form a differential input/

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

loading to the bus when the driver is disabled or VCC

= 0. This port features wide positive and negative

common-mode voltage ranges, making the device an

excellent choice for party-line applications.

The SN65ALS1176 is characterized for operation from

– 25°C to 85°C.