Home Interface I2C ICs I2C switches & multiplexers
Home
Interface
I2C ICs
I2C switches & multiplexers

TCA9545A

ACTIVE

4-channel 1.65- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation

Order now
Data sheet
4-channel 1.65- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation

TCA9545A

ACTIVE
Data sheet Order now

Product details

Addresses 4 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 1.65 Features Interrupt Pin, Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 4
Addresses 4 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 1.65 Features Interrupt Pin, Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 4
open-in-new Find other I2C switches & multiplexers
TSSOP (PW) 20 29 mm² 6.5 x 4.4
open-in-new Find other I2C switches & multiplexers
  • 1-of-4 Bidirectional translating switches
  • I2C bus and SMBus compatible
  • Four active-low interrupt inputs
  • Active-low interrupt output
  • Active-low reset input
  • Two address terminals, allowing up to four devices on the I2C bus
  • Channel selection via 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
  • 5.5 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
  • Active-low reset input
  • Two address terminals, allowing up to four devices on the I2C bus
  • Channel selection via 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
  • 5.5 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)
open-in-new Find other I2C switches & multiplexers

The TCA9545A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four 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. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt (INT) output acts as an AND of the four interrupt inputs.

An active-low reset (RESET) input allows the TCA9545A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. 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 TCA9545A. 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 terminals are 5.5 V tolerant.

The TCA9545A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four 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. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt (INT) output acts as an AND of the four interrupt inputs.

An active-low reset (RESET) input allows the TCA9545A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. 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 TCA9545A. 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 terminals are 5.5 V tolerant.

open-in-new Find other I2C switches & multiplexers
Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 8
Type Title Date
* Data sheet TCA9545A Low Voltage 4-channel I2C and SMbus Switch With Interrupt Logic and Reset Functions datasheet (Rev. D) 29 Oct 2019
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
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

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 (...)

document-pdfAcrobat User guide
In stock
Limit: 1
Simulation model

TCA9545A IBIS Model

SCPM031.ZIP (71 KB) - IBIS Model
Download
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 (...)
Request
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 (...)
document-pdfAcrobat User guide
View options
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 (...)
Start evaluation
Package Pins Download
TSSOP (PW) 20 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos