Simple Two-Wire Bus Buffer

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Block Diagram

Block diagram of PCA9525


  • Simple impedance isolating buffer for 2-wire buses
  • 4 mA maximum static open-drain pull-down capability supports a wide range of bus standards
  • Works with I²C-bus (Standard-mode, Fast-mode), SMBus (standard and high power mode), and PMBus
  • Fast switching times allow operation in excess of 1 MHz
  • Enable allows bus segments to be disconnected
  • Hysteresis on inputs provides noise immunity
  • Operating voltages from 2.7 V to 5.5 V
  • Very low supply current
  • Uncomplicated characteristics suitable for quick implementation in most common 2-wire bus applications


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