Four-Channel I²C-Bus Multiplexer with Interrupt Logic

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The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I²C-bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the four interrupt inputs, is provided.

A power-on reset function puts the registers in their default state and initializes the I²C-bus state machine with no channels selected.

The pass gates of the multiplexer are constructed such that the V_DD pin can be used to limit the maximum high voltage which will be passed by the PCA9544A. This allows the use of different bus voltages on each SCx/SDx 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 V tolerant.

Data Sheet

Application Notes

Product Details

Block Diagram

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PCA9544A
PCA9544ABS, PCA9544AD, PCA9544APW

PCA9544A

PCA9544ABS, PCA9544AD, PCA9544APW

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Features

Key Features

1-of-4 bidirectional translating multiplexer
I²C-bus interface logic; compatible with SMBus
4 active LOW interrupt inputs
Active LOW interrupt output
3 address pins allowing up to 8 devices on the I²C-bus
Channel selection via I²C-bus
Power-up with all multiplexer channels deselected
Low R_on 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 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
Three packages offered: SO20, TSSOP20 and HVQFN20

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Design Resources

Design Files

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4 design files

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

Models
PCA9544A IBIS model

ZIPRev 1.0Sep 2, 2014 00:00:0073.98 KBPCA9544A_1
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Symbols and Footprints
PCA9544ABS-HVQFN20-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jun 22, 2020 14:12:0052.66 KBPCA9544ABS-HVQFN20-BXL
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Symbols and Footprints
PCA9544APW-TSSOP20-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0038.37 KBPCA9544APW-TSSOP20-BXL
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Design Files - miscellaneous
Expert mode sample code PCA9544A

TXTRev 1.0Dec 10, 2014 00:00:001.56 KBPCA9544A_1_2
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Other NXP Products

Four-Channel I²C-Bus Multiplexer with Interrupt Logic

Product Details

Block Diagram

PCA9544A

PCA9544ABS, PCA9544AD, PCA9544APW

Features

Key Features

Buy/Parametrics

Documentation

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Application Note (1)

AN262[AN262]

Brochure (2)

NXP I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns[75017540]

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)

4-channel I2C-bus multiplexer with interrupt logic[PCA9544A]

Fact Sheet (1)

PCA9XX FactSheet[PCA9XX-FACTSHEET]

Package Information (3)

plastic thin shrink small outline package; 20 leads; body width 4.4 mm[SOT360-1]

plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm[SOT662-1]

plastic small outline package; 20 leads; body width 7.5 mm[SOT163-1]

Packing Information (2)

HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT662-1_118]

TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT360-1_118]

User Guide (3)

I2C-bus specification and user manual[UM10204]

PCA9632 demonstration board OM13269[UM10528]

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

Design Resources

Design Files

Filter by

PCA9544A IBIS model

PCA9544ABS-HVQFN20-CAD Symbol and PCB Footprint – BXL File

PCA9544APW-TSSOP20-CAD Symbol and PCB Footprint – BXL File

Expert mode sample code PCA9544A

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