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.