Dual Bidirectional I2C-Bus and SMBus Voltage-Level Translator

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PCA9306 Block Diagram

PCA9306 Block Diagram

Block diagram: PCA9306D, PCA9306DC, PCA9306DC1, PCA9306DP, PCA9306DP1, PCA9306GM


  • 2-bit bidirectional translator for SDA and SCL lines in mixed-mode I2C-bus applications
  • Standard-mode, fast-mode and fast-mode plus I2C-bus and SMBus compatible
  • Less than 1.5 ns maximum propagation delay to accommodate standard-mode and fast-mode I2C-bus devices and multiple leaders
  • Allows voltage level translation between:
    • 1.0 V Vref(1) and 1.8 V, 2.5 V, 3.3 V or 5 V Vbias(ref)(2)
    • 1.2 V Vref(1) and 1.8 V, 2.5 V, 3.3 V or 5 V Vbias(ref)(2)
    • 1.8 V Vref(1) and 3.3 V or 5 V Vbias(ref)(2)
    • 2.5 V Vref(1) and 5 V Vbias(ref)(2)
    • 3.3 V Vref(1) and 5 V Vbias(ref)(2)
  • Provides bidirectional voltage translation with no direction pin
  • Low 3.5 Ω ON-state connection between input and output ports provides less signal distortion
  • Open-drain I2C-bus I/O ports (SCL1, SDA1, SCL2 and SDA2)
  • 5 V tolerant I²C-bus I/O ports to support mixed-mode signal operation
  • High-impedance SCL1, SDA1, SCL2 and SDA2 pins for EN = LOW
  • Lock-up free operation
  • Flow through pinout for ease of printed-circuit board trace routing
  • ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
  • Packages offered: SO8, TSSOP8, VSSOP8, XQFN8, XSON8, XSON8U


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