1 Features
• Bidirectional transceivers
• Meets or exceeds the requirements of ANSI
standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.11 and X.27
• Designed for multipoint transmission on long bus
lines in noisy environments
• 3-state driver and receiver outputs
• Individual driver and receiver enables
• Wide positive and negative input/output bus
voltage ranges
• ±60mAm maximum driver output capability
• Thermal shutdown protection
• Driver positive and negative current limiting
• 12kΩ minimum receiver input impedance
• ±200mV receiver input sensitivity
• 50mV typical receiver input hysteresis
• Operates from a single 5V supply

2 Applications
• Chemical and gas sensors
• Digital signage
• Human machine interfaces (HMI)
• Motor controls
– AC induction
– Brushed and brush-less DC
– Low- and high-voltage
– Stepper motors
– Permanent magnets
• TETRA base stations
• Telecommunication towers
– Remote electrical tilt (RET) units
– Tower mounted amplifiers (TMA)
• Weigh scales
• Wireless repeaters

3 Description
The SN65176B and SN75176B differential bus
transceivers are designed for bidirectional data
communication on multipoint bus transmission lines.
The SN65176B and SN75176B are designed
for balanced transmission lines and meet ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU
Recommendations V.11 and X.27.
The SN65176B and SN75176B devices combine
a 3-state differential line driver and a differential
input line receiver, both of which operate from a
single 5V power supply. The driver has a active-high
enable and the receiver has an active-low enable,
that can connect together externally to function as a
direction control. The driver differential outputs and
the receiver differential inputs are connected internally
to form differential input/output (I/O) bus ports that are
designed to offer minimum loading to the bus when
the driver is disabled or VCC = 0. These ports feature
wide positive and negative common-mode voltage
ranges, making the device appropriate for party-line
applications.
The driver is designed for up to 60mA of sink
or source current. The driver features positive
and negative current limiting and thermal shutdown
for protection from line-fault conditions. Thermal
shutdown is designed to occur at a junction
temperature of approximately 150°C. The receiver
features a minimum input impedance of 12kΩ, an
input sensitivity of ±200mV, and a typical input
hysteresis of 50mV.