Hot Swappable 2-Wire Bus Buffers


Hot Swappable 2-Wire Bus Buffers

2 Wire Bus Buffers

The TCA4311A is a hot swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock busses. Control circuitry prevents the backplane from being connected to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are precharged to 1 V to minimize the current required to charge the parasitic capacitance of the chip.

When the I2C bus is idle, the TCA4311A can be put into shutdown mode by setting the EN pin low. When EN is high, the TCA4311A resumes normal operation.

  • Operating Power-Supply Voltage Range of 2.7-V to 5.5-V
  • Supports Bidirectional Data Transfer of I2C Bus Signals
  • SDA and SCL Lines Are Buffered Which Increases Fanout
  • 1-V Precharge on All SDA and SCL Lines Prevents Corruption During
  • Live Board Insertion and Removal From Backplane
  • SDA and SCL Input Lines Are Isolated From Outputs
  • Accommodates Standard Mode and Fast Mode I2C Devices
  • Improved Noise Immunity
  • Applications Include Hot Board Insertion and Bus Extension
  • Low ICC Chip Disable of <1 µA
  • READY Open-Drain Output
  • Supports Clock Stretching, Arbitration, and Synchronization
  • Powered-Off High-Impedance I2C Pins
  • Open-Drain I2C Pins
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 8000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

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