ADUM1250:  Hot Swappable Dual I2C Isolator

The ADuM1250/ADuM1251* are hot swappable digital isolators with nonlatching, bidirectional communication channels compatible with I2C® interfaces. This eliminates the need for splitting ...More

ADUM1250:  Hot Swappable Dual I2C Isolator

Product Description

The ADuM1250/ADuM1251* are hot swappable digital isolators with nonlatching, bidirectional communication channels compatible with I2C® interfaces. This eliminates the need for splitting I2C signals into separate transmit and receive signals for use with standalone optocouplers.

The ADuM1250 provides two bidirectional channels, supporting a complete isolated I2C interface. The ADuM1251 provides one bidirectional channel and one unidirectional channel for those applications where a bidirectional clock is not required.

Both the ADuM1250 and ADuM1251 contain hot swap circuitry to prevent glitching data when an unpowered card is inserted onto an active bus.

These isolators are based on iCoupler ® chip scale transformer technology from Analog Devices, Inc. iCoupler is a magnetic isolation technology with functional, performance, size, and power consumption advantages as compared to optocouplers. With the ADuM1250/ADuM1251, iCoupler channels can be integrated with semiconductor circuitry, which enables a complete isolated I2C interface to be implemented in a small form factor.

Applications

  • Isolated I2C, SMBus, or PMBus interfaces
  • Multilevel I2C interfaces
  • Power supplies
  • Networking
  • Power-over-Ethernet

    • *Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.

    Data Sheet, Rev. A, 6/07

    Features

    • Bidirectional I2C communication
    • Open-drain interfaces
    • Suitable for hot swap applications
    • 30 mA current sink capability
    • 1000 kHz operation
    • 3.0 V to 5.5 V supply/logic levels
    • 8-lead SOIC RoHS-compliant package
    • High temperature operation: 105°C
    • Safety and regulatory approvals
      UL recognition
      2500 V rms for 1 minute per UL 1577
      CSA Component Acceptance Notice #5A
      VDE certificate of conformity
      DIN V VDE V 0884-10
      (VDE V 0884-10):2006-12
      VIORM = 560 V peak

    Diagrams

    ADuM1250 Diagram
    Functional Block Diagram for ADuM1250

    Specifications

    Max Operating Temp (°C) 105Deg
    Insulation Rating (kVrms) 2.5kV rms
    Serial Clock Bidirectional
    # Ch 1
    Pulse Width Distort (ns) 67ns
    Max Prop Delay (ns) 150ns
    Output Default State High

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