ISO1412 Isolated RS-485/RS-422 Transceiver

By Texas Instruments 190

ISO1412 Isolated RS-485/RS-422 Transceiver

Texas Instruments' ISO1412 device is a galvanically-isolated differential line transceiver for TIA/EIA RS-485 and RS-422 applications. The noise-immune transceiver is designed to operate in harsh industrial environments. The bus pins of the device can endure high levels of IEC electrostatic discharge (ESD) and IEC electrical fast transient (EFT) events which eliminate the need for additional components on the bus for system-level protection. The device is available for basic and reinforced isolation.

The transceiver is used for long-distance communications. Isolation breaks the ground loop between the communicating nodes allowing for a much larger common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 5,000 VRMS of isolation for one minute per UL 1577 between the bus-line transceiver and the logic-level interface.

  • Compatible with TIA/EIA-485-A
  • PROFIBUS-compatible at 5 V bus-side supply
  • Bus I/O protection:
    • ±30 kV HBM
    • ±16 kV IEC 61000-4-2 contact discharge
    • ±4 kV IEC 61000-4-4 electrical fast transient
  • Low EMI: 500 kbps, 12 Mbps, and 50 Mbps data rates
  • 1.71 V to 5.55 V logic-side supply (VCC1) and 3 V to 5.5 V bus-side supply (VCC2)
  • Failsafe receiver for bus open, short, and idle
  • ⅛ unit load up to 256 nodes on bus
  • 100 kV/µs (typ.) high common-mode transient immunity
  • Extended temperature range: -40°C to +125°C
  • Glitch-free power-up and power-down for hot plug-in
  • Wide-body SOIC-16 package
  • Pin-compatible to most isolated RS-485 transceivers
  • Safety-related certifications:
    • All certifications planned
    • 7071 VPK VIOTM and 1,500 VPK VIORM (reinforced and basic options) per DIN V VDE V 0884-11:2017-01
    • 5,000 VRMS isolation for one minute per UL 1577
    • IEC 60950-1, IEC 62368-1, IEC 60601-1, and IEC 61010-1 certifications
    • CQC, TUV, and CSA approvals
  • Grid infrastructure
  • Solar inverters
  • Factory automation and controls
  • Motor drives
  • HVAC systems and building automation

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