4-channel 2.3- to 5.5-V I2C/SMBus switch with reset & voltage translation
Product details
Parameters
Package | Pins | Size
Features
- 1-of-4 Bidirectional Translating Switches
- I2C Bus and SMBus Compatible
- Active-Low Reset Input
- Three Address Pins, Allowing up to Eight
PCA9546A 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 2.3 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
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)
Description
The PCA9546A 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.
An active-low reset (RESET) input allows the PCA9546A 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 pin can be used to limit the maximum high voltage, which will be passed by the PCA9546A. 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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | PCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function datasheet (Rev. G) | Apr. 28, 2016 |
Application note | I2C Solutions for Hot Swap Applications | Jan. 31, 2020 | |
Application note | I2C Dynamic Addressing | Apr. 25, 2019 | |
Selection guide | Logic Guide (Rev. AB) | Jun. 12, 2017 | |
Application note | Choosing the Correct I2C Device for New Designs | Sep. 07, 2016 | |
Application note | Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) | Dec. 02, 2015 | |
Application note | Understanding the I2C Bus | Jun. 30, 2015 | |
Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | May 15, 2015 | |
Application note | I2C Bus Pull-Up Resistor Calculation | Feb. 13, 2015 | |
Application note | Programming Fun Lights With TI's TCA6507 | Nov. 30, 2007 | |
Application note | Semiconductor Packing Material Electrostatic Discharge (ESD) Protection | Jul. 08, 2004 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- GUI-based web application
- Exportable designs
- JSON file uploader
- Bill of materials generator
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
SOIC (D) | 16 | View options |
SOIC (DW) | 16 | View options |
TSSOP (PW) | 16 | View options |
TVSOP (DGV) | 16 | View options |
VQFN (RGV) | 16 | View options |
VQFN (RGY) | 16 | View options |
Ordering & quality
- 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
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.