ISO1176T - Isolated ProfiBus Transceiver with integrated transformer driver

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 4242V_PK of isolation per VDE for 60 seconds between the line transceiver and the logic-level 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 V_CC2 = 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.

• 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% (I_LOAD = 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 V_PK Basic Insulation per DIN V VDE V
    0884-10 and DIN EN 61010-1
  • 2500 V_RMS Isolation for 1 minute per UL 1577
  • CSA Component Acceptance Notice 5A, IEC
    60950-1 and IEC 61010-1 Standards