Features

 Bidirectional Translator of 1:8 I2C Switch

 Active-Low Reset Input

 Three address terminals, allowing up to 8 devices

on the I2C Bus

 Operating Power-Supply Voltage Range of 2.3 V

to 5.5 V

 Allows Voltage-Level Translation Between 2.5 V,

3.3 V, and 5 V Buses

 Support Standard Mode and Fast Mode I2C

Devices，0 to 400-kHz Clock Frequency

 Low RON Switches

 Latch-Up performance exceeds 200 mA per JESD

78

 ESD Protection Exceeds JESD 22

− 3.5 kV Human-Body Model

− 1.5 kV Charged-Device Model

Applications

 Servers/Storages

 Routers (Telecom Switching Equipment)

 Factory Automation

 Products With I2C Slave Address Conflicts (e.g.,

Multiple, Identical Temp Sensors)

Description

The TPT29548A is a 1:8 bidirectional translating I2C

switch. The SCL/SDA upstream pair fans out to eight

downstream channels. Any single SCn/SDn channel

or combination of channels can be selected,

determined by the programmable control register.

If one of the downstream I2C buses is stuck in a low

state, then an active-low reset (̅RESET ̅̅̅̅̅̅̅̅̅) input helps

the TPT29548A to recover. Pulling ̅RESET ̅̅̅̅̅̅̅̅̅ low resets

the I2C state machine and causes all the channels to

be deselected, as does the internal power-on reset

function.

The pass gates of the switches are constructed such

that the VCC terminal can be used to limit the

maximum high voltage, which will be passed by the

TPT29548A. This allows the use of different bus

voltages on each pair, so that 2.5 V, or 3.3 V parts

can communicate with 5 V parts, without any

additional protection. External pull-up resistors pull

the bus up to the desired voltage level for each

channel. All I/O terminals are 5.5 V tolerant.

TPT29548A is available in TSSOP24 and QFN24L

package, and is characterized from −40°C to +85°C