General Description
The G3401 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 2.5V to 5.5V VREF2 . It allows bidirectional voltage translations between 1.2V and 5V, without use of directional pin. The low ON-state resistance (rON) of the switch ensures the connections to be with minimal propagation delay. When EN is high, the translator switch is ON, and the SCL1 I/O 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 exists between ports.

FEATUREs
■ 2-Bit Bidirectional Translator for SDA and SCL Lines in Mix-Mode I2C Applications
■ I2C and SMBus Compatible
■ Less than 1.5ns Maximum Propagation Delay to Accommodate Standard-Mode and Fast-Model I2C Devices and Multiple Masters
■ Allows Voltage-Level Translator Between
    ♦ 1.2V VREF1 and 2.5V, 3.3V, 5V VREF2
    ♦ 1.8V VREF1 and 3.3V, 5V VREF2
    ♦ 3.3V VREF1 and 5V VREF2
■ Provides Bidirectional Voltage Translation without Direction Pin
■ Low 3.5Ω ON-State Connection Between Input and Output Ports Provides Less Signal Distortion
■ Open-Drain I2C I/O Ports
■ 5V Tolerant I2C I/O Ports to Support Mixed Mode Signal Operation
■ High Impedance SCL1,SDA1,SCL2 and SDA2 Pins for EN=Low
■ Lock-up-Free Operation for Isolation When EN=Low