1 Features
• Meets or Exceeds the Requirements of EN 50170
and TIA/EIA-485-A
• Signaling Rates up to 40 Mbps
• Easy Isolated Power Design with Integrated
Transformer Driver
• Typical Efficiency > 60% (ILOAD = 100 mA) - see
SLUU471
• Differential Output exceeds 2.1 V (54-Ω Load)
• Low Bus Capacitance 10 pF (Maximum)
• Fail-safe Receiver for Bus Open, Short, or Idle
• 50-kV/μs Typical Transient Immunity
• Safety and Regulatory Approvals
– 4242 VPK Basic Insulation per DIN EN IEC
60747-17 (VDE 0884-17)
– 2500 VRMS Isolation for 1 minute per UL 1577
– CSA 60950-1 and CSA 61010-1 Standards

2 Applications
• Profibus®
• Factory Automation
• Networked Sensors
• Motor/motion Control
• HVAC and Building Automation Networks
• Networked Security Stations

3 Description
The ISO1176T is an isolated differential line
transceiver with integrated oscillator outputs that
provide the primary voltage for an isolation
transformer. The device is ideal for long transmission
lines because the ground loop is broken to allow the
device to operate with a much larger common-mode
voltage range.
The symmetrical isolation barrier of each device is
tested to provide 4242VPK of isolation per VDE for 60
seconds between the line transceiver and the logiclevel
interface.
The galvanically isolated differential bus transceiver is
an integrated circuit designed for bi-directional data
communication on multipoint bus-transmission lines.
The transceiver combines a galvanically isolated
differential line driver and differential input line
receiver. The driver has an active-high enable with
isolated enable-state output on the ISODE pin (pin
10) to facilitate 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 VCC2 = 0.
Any cabled I/O can be subjected to electrical
noise transients from various sources. These noise
transients can cause damage to the transceiver
and/or near-by sensitive circuitry if they are of
sufficient magnitude and duration. The ISO1176T can
significantly reduce the risk of data corruption and
damage to expensive control circuits.
The device is characterized for operation over the
ambient temperature range of –40°C to 85°C.