The PCA9306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input, and is operational from 1.2-V to 3.3-V VREF1 and 1.8-V to 5.5-V VREF2.

The PCA9306 device allows bidirectional voltage translations between 1.2 V and 5 V, without the use of a direction pin. The low ON-state resistance (RON) of the switch allows connections to be made with minimal propagation delay. When EN is high, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and a high-impedance state exists between ports.

In addition to voltage translation, the PCA9306 device can be used to isolate a 400-kHz bus from a 100-kHz busby controlling the EN pin, and disconnecting the slower bus during fast-mode communication.

• 2-Bit Bidirectional Translator for SDA and SCL 
  Lines in Mixed-Mode I2C Applications
• I2C and SMBus Compatible
• Less Than 1.5-ns Maximum Propagation Delay to 
  Accommodate Standard-Mode and Fast-Mode I2C 
  Devices and Multiple Masters
• Allows Voltage-Level Translation Between
  • 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V, 
    or 5-V VREF2
  • 1.8-V VREF1 and 2.5-V, 3.3-V, 
    or 5-V VREF2
  • 2.5-V VREF1 and 3.3-V or 5-V VREF2
  • 3.3-V VREF1 and 5-V VREF2
• Provides Bidirectional Voltage Translation With No 
  Direction Pin
• Low 3.5-Ω ON-State Resistance Between Input 
  and Output Ports Provides Less Signal Distortion
• Open-Drain I2C I/O Ports (SCL1, SDA1, SCL2, 
  and SDA2)
• 5-V Tolerant I2C I/O Ports to Support Mixed-Mode 
  Signal Operation
• High-Impedance SCL1, SDA1, SCL2, and SDA2 
  Pins for EN = Low
• Lockup-Free Operation for Isolation When 
  EN = Low
• Flow-Through Pinout for Ease of Printed-Circuit- 
  Board Trace Routing
• Latch-Up Performance Exceeds 100 mA Per 
  JESD 78, Class II
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-A)
  • 1000-V Charged-Device Model (C101)
• APPLICATIONS
  • I2C, SMBus, PMBus, MDIO, UART, Low-Speed 
    SDIO, GPIO, and Other Two-Signal Interfaces
  • Servers
  • Routers (Telecom Switching Equipment)
  • Personal Computers
  • Industrial Automation