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
PCA9548ABS, PCA9548AD, PCA9548APW

PCA9548A

PCA9548ABS, PCA9548AD, PCA9548APW

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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 Programs

Product Longevity

Participating products are available for a minimum of 10 years. Designated participating products developed for the automotive, telecom and medical segments are available for a minimum of 15 years.

Buy/Parametrics

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Design Resources

Design Files

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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
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MCIMX8DXL-WEVK

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Other NXP Products

Eight-Channel I²C-Bus Switch with Reset

Product Details

Block Diagram

PCA9548A

PCA9548ABS, PCA9548AD, PCA9548APW

Features

Key Features

Packages Offered

Product Programs

Product Longevity

Buy/Parametrics

Documentation

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Application Note (2)

AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note[AN10441]

AN262[AN262]

Brochure (1)

Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x[75016529]

Data Sheet (1)

8-channel I2C-bus switch with reset[PCA9548A]

Fact Sheet (1)

PCA9XX FactSheet[PCA9XX-FACTSHEET]

Package Information (3)

plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.85 mm[SOT616-1]

plastic thin shrink small outline package; 24 leads; body width 4.4 mm[SOT355-1]

plastic small outline package; 24 leads; body width 7.5 mm[SOT137-1]

Packing Information (4)

HVQFN24; Reel pack; SMD, 13", Q2/T3 Turned product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128[SOT616-1_128]

HVQFN24; reel pack; standard product orientation; 12NC ending 118[SOT616-1_118]

TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT355-1_118]

SO24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT137-1_118]

Supporting Information (2)

Footprint for wave soldering[SSOP-TSSOP-VSO-WAVE]

Footprint for Wave Soldering[SO-SOJ-WAVE]

User Guide (2)

I2C-bus specification and user manual[UM10204]

I2C Demonstration Board 2005-1 Quick Start Guide[UM10206]

Design Resources

Design Files

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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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