Four-Channel I²C-Bus Multiplexer with Interrupt Logic | NXP Semiconductors

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Four-Channel I²C-Bus Multiplexer with Interrupt Logic

PCA9544A Active

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 VDD 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.

Product Details

Block Diagram

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PCA9544A

PCA9544A Block Diagram

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 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 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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N true 0 PSPPCA9544Aen 13 Application Note Application Note t789 1 Brochure Brochure t518 2 Data Sheet Data Sheet t520 1 Fact Sheet Fact Sheet t523 1 Package Information Package Information t790 3 Packing Information Packing Information t935 2 User Guide User Guide t792 3 en_US en_US en Data Sheet Data Sheet 1 1 5.0 English 1442055635464724049250 PSP 277.7 KB None None documents None 1442055635464724049250 /docs/en/data-sheet/PCA9544A.pdf 277663 /docs/en/data-sheet/PCA9544A.pdf PCA9544A documents N N 2014-04-23 4-channel I2C-bus multiplexer with interrupt logic /docs/en/data-sheet/PCA9544A.pdf /docs/en/data-sheet/PCA9544A.pdf Data Sheet N 980000996212993340 2022-12-07 pdf N en Apr 23, 2014 980000996212993340 Data Sheet Y N 4-channel I2C-bus multiplexer with interrupt logic Application Note Application Note 1 2 2.0 English 1442087835667690821743 PSP 826.2 KB None None documents None 1442087835667690821743 /docs/en/application-note/AN262.pdf 826199 /docs/en/application-note/AN262.pdf AN262 documents N N 2011-07-04 AN262 /docs/en/application-note/AN262.pdf /docs/en/application-note/AN262.pdf Application Note N 645036621402383989 2024-03-13 pdf N en Oct 1, 2004 645036621402383989 Application Note Y N AN262 User Guide User Guide 3 3 6.0 Japanese 1442125286808710770774ja PSP 751.0 KB None None documents None 1442125286808710770774 /docs/ja/user-guide/UM10204.pdf 750958 /docs/ja/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/ja/user-guide/UM10204.pdf /docs/ja/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 ja Apr 28, 2014 132339537837198660 User Guide Y N I2C-bus specification and user manual 7.0 English NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. 1442125286808710770774 PSP 751.0 KB None None documents None 1442125286808710770774 /docs/en/user-guide/UM10204.pdf 750958 /docs/en/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf /docs/en/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 pdf N en Oct 1, 2021 132339537837198660 User Guide Y N I2C-bus specification and user manual 4 1.0 English 1442125429801702674389 PSP 749.6 KB Registration without Disclaimer None documents Extended 1442125429801702674389 /secured/assets/documents/en/user-guide/UM10528.pdf 749626 /secured/assets/documents/en/user-guide/UM10528.pdf UM10528 documents Y N 2012-02-06 PCA9632 demonstration board OM13269 /webapp/Download?colCode=UM10528 /secured/assets/documents/en/user-guide/UM10528.pdf User Guide N 132339537837198660 2025-02-10 pdf Y en Feb 6, 2012 132339537837198660 User Guide Y N PCA9632 demonstration board OM13269 5 1.0 English The I2C Demonstration Board 2005-1 is a new expandable low cost I2C based platform that allows Field Application Engineers, designers and educators to use their Personal Computer (PC) to easily test and demonstrate I2C-bus devices from Philips Semiconductors in a platform similar to a real system environment. 1442125267076701864849 PSP 267.7 KB Registration without Disclaimer None documents Extended 1442125267076701864849 /secured/assets/documents/en/user-guide/UM10206.pdf 267686 /secured/assets/documents/en/user-guide/UM10206.pdf UM10206 documents Y N 2016-07-12 I2C Demonstration Board 2005-1 Quick Start Guide /webapp/Download?colCode=UM10206 /secured/assets/documents/en/user-guide/UM10206.pdf User Guide N 132339537837198660 2024-07-12 pdf Y en Jun 13, 2006 132339537837198660 User Guide Y N I2C Demonstration Board 2005-1 Quick Start Guide Brochure Brochure 2 6 1.0 English 1442048542291707237639 PSP 3.6 MB None None documents None 1442048542291707237639 /docs/en/brochure/75017540.pdf 3625610 /docs/en/brochure/75017540.pdf 75017540 documents N N 2016-07-12 NXP I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns /docs/en/brochure/75017540.pdf /docs/en/brochure/75017540.pdf Brochure N 712453003803778552 2024-10-24 pdf N en Apr 8, 2018 712453003803778552 Brochure Y N NXP I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns 7 1.0 English 1442124653171725284460 PSP 656.7 KB None None documents None 1442124653171725284460 /docs/en/brochure/75016529.pdf 656663 /docs/en/brochure/75016529.pdf 75016529 documents N N 2011-09-12 Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x /docs/en/brochure/75016529.pdf /docs/en/brochure/75016529.pdf Brochure N 712453003803778552 2024-08-21 pdf N en Apr 8, 2018 712453003803778552 Brochure Y N Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x Fact Sheet Fact Sheet 1 8 1 English 1557513331449729197888 PSP 436.6 KB None None documents None 1557513331449729197888 /docs/en/fact-sheet/PCA9xx-FactSheet.pdf 436600 /docs/en/fact-sheet/PCA9xx-FactSheet.pdf PCA9XX-FACTSHEET documents N N 2019-05-10 PCA9XX FactSheet /docs/en/fact-sheet/PCA9xx-FactSheet.pdf /docs/en/fact-sheet/PCA9xx-FactSheet.pdf Fact Sheet N 736675474163315314 2022-12-07 pdf N en May 10, 2019 736675474163315314 Fact Sheet Y N PCA9XX FactSheet Package Information Package Information 3 9 1.0 English 1455078603712720580365 PSP 310.8 KB None None documents None 1455078603712720580365 /docs/en/package-information/SOT360-1.pdf 310839 /docs/en/package-information/SOT360-1.pdf SOT360-1 documents N N 2016-02-12 plastic thin shrink small outline package; 20 leads; body width 4.4 mm /docs/en/package-information/SOT360-1.pdf /docs/en/package-information/SOT360-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic thin shrink small outline package; 20 leads; body width 4.4 mm 10 1.0 English 1455079670029721489839 PSP 213.9 KB None None documents None 1455079670029721489839 /docs/en/package-information/SOT662-1.pdf 213918 /docs/en/package-information/SOT662-1.pdf SOT662-1 documents N N 2016-02-12 plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm /docs/en/package-information/SOT662-1.pdf /docs/en/package-information/SOT662-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm 11 1.0 English plastic small outline package; 20 leads; body width 7.5 mm 1455079171621724647129 PSP 343.2 KB None None documents None 1455079171621724647129 /docs/en/package-information/SOT163-1.pdf 343226 /docs/en/package-information/SOT163-1.pdf SOT163-1 documents N N 2016-02-12 plastic small outline package; 20 leads; body width 7.5 mm /docs/en/package-information/SOT163-1.pdf /docs/en/package-information/SOT163-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic small outline package; 20 leads; body width 7.5 mm Packing Information Packing Information 2 12 1.0 English 1442131203291729471151 PSP 272.0 KB None None documents None 1442131203291729471151 /docs/en/packing/SOT662-1_118.pdf 271965 /docs/en/packing/SOT662-1_118.pdf SOT662-1_118 documents N N 2013-04-18 HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT662-1_118.pdf /docs/en/packing/SOT662-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 18, 2013 145666923842250347 Packing Information Y N HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 13 4.0 English 1442131717959689109779 PSP 230.0 KB None None documents None 1442131717959689109779 /docs/en/packing/SOT360-1_118.pdf 230045 /docs/en/packing/SOT360-1_118.pdf SOT360-1_118 documents N N 2013-04-17 TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT360-1_118.pdf /docs/en/packing/SOT360-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 15, 2013 145666923842250347 Packing Information Y N TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 false 0 PCA9544A downloads en true 1 Y PSP Y Y Application Note 1 /docs/en/application-note/AN262.pdf 2011-07-04 1442087835667690821743 PSP 2 Oct 1, 2004 Application Note None /docs/en/application-note/AN262.pdf English documents 826199 None 645036621402383989 2024-03-13 N /docs/en/application-note/AN262.pdf AN262 /docs/en/application-note/AN262.pdf documents 645036621402383989 Application Note N en None Y pdf 2.0 N N AN262 826.2 KB AN262 N 1442087835667690821743 Brochure 2 /docs/en/brochure/75017540.pdf 2016-07-12 1442048542291707237639 PSP 6 Apr 8, 2018 Brochure None /docs/en/brochure/75017540.pdf English documents 3625610 None 712453003803778552 2024-10-24 N /docs/en/brochure/75017540.pdf NXP I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns /docs/en/brochure/75017540.pdf documents 712453003803778552 Brochure N en None Y pdf 1.0 N N NXP I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns 3.6 MB 75017540 N 1442048542291707237639 /docs/en/brochure/75016529.pdf 2011-09-12 1442124653171725284460 PSP 7 Apr 8, 2018 Brochure None /docs/en/brochure/75016529.pdf English documents 656663 None 712453003803778552 2024-08-21 N /docs/en/brochure/75016529.pdf Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x /docs/en/brochure/75016529.pdf documents 712453003803778552 Brochure N en None Y pdf 1.0 N N Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x 656.7 KB 75016529 N 1442124653171725284460 Data Sheet 1 /docs/en/data-sheet/PCA9544A.pdf 2014-04-23 1442055635464724049250 PSP 1 Apr 23, 2014 Data Sheet None /docs/en/data-sheet/PCA9544A.pdf English documents 277663 None 980000996212993340 2022-12-07 N /docs/en/data-sheet/PCA9544A.pdf 4-channel I2C-bus multiplexer with interrupt logic /docs/en/data-sheet/PCA9544A.pdf documents 980000996212993340 Data Sheet N en None Y pdf 5.0 N N 4-channel I2C-bus multiplexer with interrupt logic 277.7 KB PCA9544A N 1442055635464724049250 Fact Sheet 1 /docs/en/fact-sheet/PCA9xx-FactSheet.pdf 2019-05-10 1557513331449729197888 PSP 8 May 10, 2019 Fact Sheet None /docs/en/fact-sheet/PCA9xx-FactSheet.pdf English documents 436600 None 736675474163315314 2022-12-07 N /docs/en/fact-sheet/PCA9xx-FactSheet.pdf PCA9XX FactSheet /docs/en/fact-sheet/PCA9xx-FactSheet.pdf documents 736675474163315314 Fact Sheet N en None Y pdf 1 N N PCA9XX FactSheet 436.6 KB PCA9XX-FACTSHEET N 1557513331449729197888 Package Information 3 /docs/en/package-information/SOT360-1.pdf 2016-02-12 1455078603712720580365 PSP 9 Feb 8, 2016 Package Information None /docs/en/package-information/SOT360-1.pdf English documents 310839 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT360-1.pdf plastic thin shrink small outline package; 20 leads; body width 4.4 mm /docs/en/package-information/SOT360-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic thin shrink small outline package; 20 leads; body width 4.4 mm 310.8 KB SOT360-1 N 1455078603712720580365 /docs/en/package-information/SOT662-1.pdf 2016-02-12 1455079670029721489839 PSP 10 Feb 8, 2016 Package Information None /docs/en/package-information/SOT662-1.pdf English documents 213918 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT662-1.pdf plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm /docs/en/package-information/SOT662-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm 213.9 KB SOT662-1 N 1455079670029721489839 /docs/en/package-information/SOT163-1.pdf 2016-02-12 1455079171621724647129 PSP 11 Feb 8, 2016 Package Information plastic small outline package; 20 leads; body width 7.5 mm None /docs/en/package-information/SOT163-1.pdf English documents 343226 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT163-1.pdf plastic small outline package; 20 leads; body width 7.5 mm /docs/en/package-information/SOT163-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic small outline package; 20 leads; body width 7.5 mm 343.2 KB SOT163-1 N 1455079171621724647129 Packing Information 2 /docs/en/packing/SOT662-1_118.pdf 2013-04-18 1442131203291729471151 PSP 12 Apr 18, 2013 Packing Information None /docs/en/packing/SOT662-1_118.pdf English documents 271965 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT662-1_118.pdf HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT662-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 1.0 N N HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 272.0 KB SOT662-1_118 N 1442131203291729471151 /docs/en/packing/SOT360-1_118.pdf 2013-04-17 1442131717959689109779 PSP 13 Apr 15, 2013 Packing Information None /docs/en/packing/SOT360-1_118.pdf English documents 230045 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT360-1_118.pdf TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT360-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 4.0 N N TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 230.0 KB SOT360-1_118 N 1442131717959689109779 User Guide 3 /docs/en/user-guide/UM10204.pdf 2016-07-12 1442125286808710770774 PSP 3 Oct 1, 2021 User Guide NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. None /docs/en/user-guide/UM10204.pdf English documents 750958 None 132339537837198660 2024-10-24 N /docs/en/user-guide/UM10204.pdf I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf documents 132339537837198660 User Guide N en None Y pdf 7.0 N N I2C-bus specification and user manual 751.0 KB UM10204 N 1442125286808710770774 /secured/assets/documents/en/user-guide/UM10528.pdf 2012-02-06 1442125429801702674389 PSP 4 Feb 6, 2012 User Guide Registration without Disclaimer /secured/assets/documents/en/user-guide/UM10528.pdf English documents 749626 None 132339537837198660 2025-02-10 Y /webapp/Download?colCode=UM10528 PCA9632 demonstration board OM13269 /secured/assets/documents/en/user-guide/UM10528.pdf documents 132339537837198660 User Guide N en Extended Y pdf 1.0 Y N PCA9632 demonstration board OM13269 749.6 KB UM10528 N 1442125429801702674389 /secured/assets/documents/en/user-guide/UM10206.pdf 2016-07-12 1442125267076701864849 PSP 5 Jun 13, 2006 User Guide The I2C Demonstration Board 2005-1 is a new expandable low cost I2C based platform that allows Field Application Engineers, designers and educators to use their Personal Computer (PC) to easily test and demonstrate I2C-bus devices from Philips Semiconductors in a platform similar to a real system environment. Registration without Disclaimer /secured/assets/documents/en/user-guide/UM10206.pdf English documents 267686 None 132339537837198660 2024-07-12 Y /webapp/Download?colCode=UM10206 I2C Demonstration Board 2005-1 Quick Start Guide /secured/assets/documents/en/user-guide/UM10206.pdf documents 132339537837198660 User Guide N en Extended Y pdf 1.0 Y N I2C Demonstration Board 2005-1 Quick Start Guide 267.7 KB UM10206 N 1442125267076701864849 true Y Products

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