ISO1176DWR Datasheet

Isolated RS-485 Profibus Transceiver


The ISO1176 device is an isolated differential line transceiver designed for use in PROFIBUS applications. The device is ideal for long transmission lines because the ground loop is broken to provide for operation with a much larger common-mode voltage range. The symmetrical isolation barrier of each device is tested to provide 2500 VRMS of isolation per UL between the line transceiver and the logic level interface.
The galvanically isolated differential bus transceiver is an integrated circuit designed for bidirectional 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 allowing up to 160 nodes.

• Meets or Exceeds the Requirements of
   EN 50170 and TIA/EIA-485-A
• Signaling Rates up to 40 Mbps
• Differential Output Exceeds 2.1 V (54-Ω Load)
• Low Bus Capacitance – 10 pF (Maximum)
• Up to 160 Transceivers on a Bus
• 50 kV/μs Typical Transient Immunity
• Fail-Safe Receiver for Bus Open, Short, Idle
• 3.3-V Inputs are 5-V Tolerant
• Bus-Pin ESD Protection
   – 16-kV HBM Between Bus Pins and GND2
   – 6-kV HBM Between Bus Pins and GND1
• Safety and Regulatory Approvals
   – 4000-VPK Isolation, 560-VPK VIORM per DIN V
      VDE V 0884-10 (VDE V 0884-10): 2006-12
      and DIN EN 61010-1
   – 2500 VRMS Isolation Rating per UL 1577
   – 4000 VPK Isolation Rating per CSA CA5A and
      IEC 60950-1

• Profibus
• Factory Automation
• Networked Sensors
• Motor and Motion Control
• HVA and Building Automation Networks
• Networked Security Stations



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