PCA9548A

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The PCA9548A is an octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.

An active LOW reset input allows the PCA9548A to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus 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 V_DD pin can be used to limit the maximum high voltage which will be passed by the PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8 V or 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 6 V tolerant.

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Data Sheet

Application Notes

Product Details

Block Diagram

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PCA9548A Block Diagram
PCA9548ABS, PCA9548AD, PCA9548APW Block Diagram

PCA9548A Block Diagram

PCA9548ABS, PCA9548AD, PCA9548APW Block Diagram

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Features

Key Features

1-of-8 bidirectional translating switches
I²C-bus interface logic; compatible with SMBus standards
Active LOW reset input
Three address pins allowing up to eight 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
6 V tolerant inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Packages Offered

SO24, TSSOP24, HVQFN24

Product Longevity Program

This product is included in NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The PCA9548APW is included in the 15-year program

Part numbers include: PCA9548ABS, PCA9548AD, PCA9548APW.

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

1-5 of 16 documents

^{Data Sheet}
8-channel I2C-bus switch with reset

PDFRev 5.1Oct 1, 2015308.4 KBPCA9548AEnglish
^{Application Note}
AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note

PDFRev 1.0Jun 20, 200753.7 KBAN10441English
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^{Application Note}
AN262

PDFRev 2.0Oct 1, 2004826.2 KBAN262English
^{User Guide}
I2C-bus specification and user manual

PDFRev 7.0Oct 1, 2021751.0 KBUM10204English, 日本語
^{User Guide}
I2C Demonstration Board 2005-1 Quick Start Guide

PDFRev 1.0Jun 13, 2006267.7 KBUM10206English
Sign in required
^Brochure
Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x

PDFRev 1.0Apr 8, 2018656.7 KB75016529English
^{Fact Sheet}
PCA9XX FactSheet

PDFRev 1May 10, 2019436.6 KBPCA9XX-FACTSHEETEnglish
^{Package Information}
plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.85 mm

PDFRev 1.0Feb 8, 2016206.7 KBSOT616-1English
^{Package Information}
plastic thin shrink small outline package; 24 leads; body width 4.4 mm

PDFRev 1.0Feb 8, 2016361.8 KBSOT355-1English
^{Package Information}
plastic small outline package; 24 leads; body width 7.5 mm

PDFRev 1.0Feb 8, 2016388.2 KBSOT137-1English
^{Packing Information}
HVQFN24; Reel pack; SMD, 13", Q2/T3 Turned product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128

PDFRev 1.0Jul 16, 2014189.8 KBSOT616-1_128English
^{Packing Information}
HVQFN24; reel pack; standard product orientation; 12NC ending 118

PDFRev 1.0Jan 16, 2014200.6 KBSOT616-1_118English
^{Packing Information}
TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 4.1Apr 15, 2013232.1 KBSOT355-1_118English
^{Packing Information}
SO24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 4.0Apr 12, 2013240.7 KBSOT137-1_118English
^{Supporting Information}
Footprint for wave soldering

PDFRev 1.0Oct 8, 200916.6 KBSSOP-TSSOP-VSO-WAVEEnglish
^{Supporting Information}
Footprint for Wave Soldering

PDFRev 1.0Oct 8, 20098.3 KBSO-SOJ-WAVEEnglish

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Design Resources

Design Files

Quick reference to our design files types.

5 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

^Models
PCA9548A IBIS model

ZIPRev 1.0Apr 4, 2016 00:00:0039.1 KBPCA9548A_1
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^{Symbols and Footprints}
PCA9548APW-TSSOP24-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0040.0 KBPCA9548APW-TSSOP24-BXL
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^{Symbols and Footprints}
PCA9548ABS-HVQFN24-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0056.1 KBPCA9548ABS-HVQFN24-BXL
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^{Symbols and Footprints}
PCA9548AD-SO24-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0056.6 KBPCA9548AD-SO24-BXL
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^{Design Files - miscellaneous}
Expert mode sample code PCA9548A

TXTRev 1.0Dec 10, 2014 00:00:001.6 KBPCA9548A_1_2
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Hardware

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1 hardware offering

^{Evaluation and Development Boards}
i.MX 8XLite Evaluation Kit

MCIMX8DXL-WEVK

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Other NXP Products

Eight-Channel I²C-Bus Switch with Reset

Product Details

Block Diagram

PCA9548A Block Diagram

PCA9548ABS, PCA9548AD, PCA9548APW Block Diagram

Features

Key Features

Packages Offered

Product Longevity Program

Buy/Parametrics

Documentation

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Design Resources

Design Files

Filter by

PCA9548A IBIS model

PCA9548APW-TSSOP24-CAD Symbol and PCB Footprint – BXL File

PCA9548ABS-HVQFN24-CAD Symbol and PCB Footprint – BXL File

PCA9548AD-SO24-CAD Symbol and PCB Footprint – BXL File

Expert mode sample code PCA9548A

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