1 Features

• 2-Bit bidirectional translator for SDA and SCL lines

in mixed-mode I2C applications

• Standard-mode, fast-mode, and fast-mode plus

I2C and SMBus compatible

• I3C compatible (12.5 MHz supported)

• Allows voltage-level translation between

– 0.9-V VREF1 and 1.8-V, 2.5-V, 3.3-V,

or 5-V VREF2

– 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 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-circuitboard

trace routing

• ESD Protection Exceeds JESD 22

– 2000-V human-body model (A114-A)

– 1000-V charged-device model (C101)

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 TCA39306 is a dual bidirectional voltage-level

translator compatible with I2C, SMBus, and I3C with

an enable (EN) input, and is operational from 0.9-V to

3.3-V VREF1 and 1.8-V to 5.5-V VREF2.

The device allows bidirectional voltage translations

between 0.85 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 TCA39306 can

be used to isolate a higher speed bus from a lower

speed bus by controlling the EN pin to disconnect the

slower bus during fast-mode communication.