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.