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TCA9544A

ACTIVE

4-channel 1.65- to 5.5-V I2C/SMBus multiplexer with interrupt & voltage translation

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Data sheet

TCA9544A

ACTIVE
Data sheet Order now

Product details

Addresses 8 Features Interrupt pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 4
Addresses 8 Features Interrupt pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 4
TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • 1-of-4 Bidirectional Translating Switches
  • I2C Bus and SMBus Compatible
  • Four Active-Low Interrupt Inputs
  • Active-Low Interrupt Output
  • Three Address Pins, Allowing up to Eight TCA9544A Devices on the I2C Bus
  • Channel Selection Via I2C Bus
  • Power-Up With All Switch Channels Deselected
  • Low RON Switches
  • Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
  • No Glitch on Power-Up
  • Supports Hot Insertion
  • Low Standby Current
  • Operating Power Supply Voltage Range of 1.65 V to 5.5 V
  • 5.5-V Tolerant Inputs
  • 0 to 400-kHz Clock Frequency
  • Latch-Up Performance Exceeds 100 mA Per JESD 78
  • ESD Protection Exceeds JESD 22
    • 4000-V Human-Body Model (A114-A)
    • 1500-V Charged-Device Model (C101)
  • 1-of-4 Bidirectional Translating Switches
  • I2C Bus and SMBus Compatible
  • Four Active-Low Interrupt Inputs
  • Active-Low Interrupt Output
  • Three Address Pins, Allowing up to Eight TCA9544A Devices on the I2C Bus
  • Channel Selection Via I2C Bus
  • Power-Up With All Switch Channels Deselected
  • Low RON Switches
  • Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
  • No Glitch on Power-Up
  • Supports Hot Insertion
  • Low Standby Current
  • Operating Power Supply Voltage Range of 1.65 V to 5.5 V
  • 5.5-V Tolerant Inputs
  • 0 to 400-kHz Clock Frequency
  • Latch-Up Performance Exceeds 100 mA Per JESD 78
  • ESD Protection Exceeds JESD 22
    • 4000-V Human-Body Model (A114-A)
    • 1500-V Charged-Device Model (C101)

The TCA9544A is a 4-channel, bidirectional translating I2C Muliplexer. The master SCL/SDA signal pair is directed to one of the four channels of slave devices, SC0/SD0-SC3/SD3. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the four interrupt inputs.

A power-on reset function returns the registers to their default state and initializes the I2C state machine, with all channels deselected.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage which will be passed by the TCA9544A. This allows the use of different bus voltages on each pair, so that 1.8-V, 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 pins are 5.5 V tolerant.

The TCA9544A is a 4-channel, bidirectional translating I2C Muliplexer. The master SCL/SDA signal pair is directed to one of the four channels of slave devices, SC0/SD0-SC3/SD3. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the four interrupt inputs.

A power-on reset function returns the registers to their default state and initializes the I2C state machine, with all channels deselected.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage which will be passed by the TCA9544A. This allows the use of different bus voltages on each pair, so that 1.8-V, 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 pins are 5.5 V tolerant.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. C) PDF | HTML Oct 29, 2019
Application note I2C Solutions for Hot Swap Applications (Rev. A) Jan 31, 2023
Application note I2C Dynamic Addressing Apr 25, 2019
Application note Choosing the Correct I2C Device for New Designs PDF | HTML Sep 7, 2016
Selection guide I2C Infographic Flyer Dec 3, 2015
Application note Understanding the I2C Bus PDF | HTML Jun 30, 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML Feb 13, 2015

Design & development

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Evaluation board

TCA9548AEVM — TCA9548A I2C 1-to-8 bidirectional translating switch evaluation module

The TCA9548AEVM is designed to evaluate and demonstrate the functionality of TI’s TCA954xA family of I2C switches. The TCA9548AEVM can be used as a standalone evaluation module to interface with an existing system or paired with the MSP430 Lauchpad which serves as the I2C master and power supply (...)

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Simulation model

TCA9544A IBIS Model

SCPM034.ZIP (71 KB) - IBIS model
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Design tool

I2C-DESIGNER — I2C designer tool

Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard (...)
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