GXA9306

1 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 
− 1.2V VREF1 and 1.8V, 2.5V, 3.3V, or 5V VREF2 − 1.8V VREF1 and 2.5V, 3.3V, or 5V VREF2 
− 2.5V VREF1 and 3.3V, or 5V VREF2 
− 3.3V VREF1 and 5V VREF2 
• Provides bidirectional voltage translation with no direction pin 
• Low 3.5Ω ON-state resistance between input and output ports provides less signal distortion • Open-drain I2C I/O ports (SCL1, SDA1, SCL2, and SDA2) 
• 5V 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 
• ESD protection exceeds 8000V HBM and 1200V CDM per JESD22 
• Package information: 

2 Applications 
• I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces 
• Servers 
• Routers (telecom switching equipment) 
• Personal computers 
• Industrial automation

3 Description 
The GXA9306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input, and is operational from 1.2V to 3.3V VREF1 and 1.8V to 5.5V VREF2. 
The GXA9306, device allows bidirectional voltage translation between 1.2V and 5V, 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 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. 

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