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TCA9548A

ACTIVE

8-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation

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Data sheet
8-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation

TCA9548A

ACTIVE
Data sheet Order now

Product details

Addresses 8 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 1.65 Features Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 8
Addresses 8 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 1.65 Features Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 8
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TSSOP (PW) 24 34 mm² 7.7 x 4.4 VQFN (RGE) 24 16 mm² 4 x 4
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  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • 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-V Tolerant inputs
  • 0- to 400-kHz Clock frequency
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • ±2000-V Human-body model (A114-A)
    • 200-V Machine model (A115-A)
    • ±1000-V Charged-device model (C101)
  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • 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-V Tolerant inputs
  • 0- to 400-kHz Clock frequency
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • ±2000-V Human-body model (A114-A)
    • 200-V Machine model (A115-A)
    • ±1000-V Charged-device model (C101)
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The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system master can reset the TCA9548A in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage 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 pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system master can reset the TCA9548A in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage 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 pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

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Technical documentation

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Type Title Date
* Data sheet TCA9548A Low-Voltage 8-Channel I2C Switch with Reset datasheet (Rev. G) 30 Nov 2018
Application note I2C Solutions for Hot Swap Applications 31 Jan 2020
Application note I2C Dynamic Addressing 25 Apr 2019
Application note Choosing the Correct I2C Device for New Designs 07 Sep 2016
Selection guide I2C Infographic Flyer 03 Dec 2015
Technical article How to simplify I2C tree when connecting multiple slaves to an I2C master 15 Oct 2015
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 13 Feb 2015
Technical article Haptics: More actuators needed? No problem. 03 Dec 2014
User guide TCA9548AEVM User's Guide 23 Apr 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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

TCA9548A IBIS Model (Rev. A)

SCPM023A.ZIP (41 KB) - IBIS Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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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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Reference designs

TIDA-01414 — TPA3244 Dolby Atmos Soundbar Reference Design

The TPA3244 Dolby Atmos® Soundbar Reference Design combines Ultra-HD audio and high dynamic range to create room filling audio experience from a small form factor system. The design leverages TI's high-performance TPA3244 amplifier, PCM5252 high-performance DAC with processing, and an (...)
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Reference designs

TIDA-01373 — EEPROM Programming Tool Reference Design

The TIDA-01373 is a reference hardware and software example of a scalable programming tool for the DRV10983, DRV10975, DRV10983-Q1, and DRV10987 integrated BLDC motor drivers. These devices feature configurable EEPROM registers that need to be set to motor-specific parameters. This reference (...)
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Package Pins Download
TSSOP (PW) 24 View options
VQFN (RGE) 24 View options

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