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.