Features

⚫ Dual bidirectional Translator for SDA and SCL Lines

in I2C Applications and SMBus Compatible

⚫ Support multi-mode: Standard-mode (SM), Fastmode (FM), and Fast-mode Plus (FM+)

⚫ Less than 1.5 ns (max) Delay to Accommodate SM

and FM I2C devices and multiple masters

⚫ Allows Voltage-Level Translation Between

◼ 3.3V VREF1 and 5V VREF2

◼ 2.5V VREF1 and 3.3V or 5 V VREF2

◼ 1.8V VREF1 and 2.5V, 3.3V, or 5V VREF2

◼ 1.2V VREF1 and 1.8V, 2.5V, 3.3V, or 5V VREF2

⚫ Provides bidirectional voltage translation with no

direction pin

⚫ High-impedance SCL1, SDA1, SCL2 and SDA2 pins

for EN = LOW

⚫ Latch-Up performance exceeds 400 mA per JESD

78

⚫ ESD Protection Exceeds JESD 22

◼ 4000-V Human-Body Model

◼ 1000-V Charged-Device Model

Applications

⚫ I2C, SMBus, PMBus, MDIO, UART, Low-Speed

SDIO, GPIO, and Other Two-Signal Interfaces

⚫ Servers/Storages

⚫ Routers (Telecom Switching Equipment)

⚫ Personal Computers/Consumer handsets

⚫ Industrial Automation

Description

The TPT29306 device is a dual bidirectional I2C and

SMBus voltage-level translator with an enable (EN) input,

and work from 1.2V to 3.6V VREF1 and 1.8V to 5.5V VREF2.

The 3.5Ω Ron make the minimal propagation delay <1.5ns.

If EN is high, the translator switch is ON, and the SCL1

and SDA1 I/O are connected to the SCL2 and SDA2 I/O,

will allow bidirectional data flow between ports. If EN is

low, the translator switch is off, and a high-impedance

state exists between ports to isolate both sides.

The TPT29306 can also be used to run two buses, one is

400 kHz and the other is 100 kHz. If the two buses are

operating at different frequency, the 100 kHz bus must be

isolated when the other 400 kHz bus is required. If the

master is running at 400 kHz, the maximum system

frequency may be less than 400 kHz because of the

delays added by the translator.

As with the standard I2C-bus system, pull-up resistors are

required in both sides, to provide the logic HIGH levels on

the translator’s bus. The device is designed to work with

SM, FM and FM+ I2C-bus devices in addition to SMBus

devices. The maximum frequency is dependent on the

RC time constant, but generally supports > 2 MHz.

TPT29306 is available in MSOP8, VSSOP8, DFN1.4X1-

8L and DFN3X4-8L(none e-pad) package, and is

characterized from –40°C to +85°C.