PCA9306

(ACTIVE) 2-Bit Bidirectional I2C Bus and SMBus Voltage-Level Shifter

Diagrams

Description

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.

Features

  • 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

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Parametrics

Number of Outputs 2    
fSCLK (Max) (MHz) 0.4    
VCC (Max) (V) 5.5    
VCC (Min) (V) 1.2    
Frequency (Max) (kHz) 400    
Channel Width 2    
Master Side I2C Bus Capacitance Supported (pF) 400    
Slave Side I2C Bus Capacitance Supported (pF) 400    
Features 5V Tolerant I/O^Enable Pin^Low Voltage^Open-Drain I/O Type    
Operating Temperature Range (C) -40 to 85    
Package Group DSBGA^SM8^VSSOP^X2SON    
Pin/Package 8DSBGA^8SM8^8VSSOP^8X2SON    

Companion Products

Technical Documents

Datasheet (1)

Application notes (8)

Selection guides (3)

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