PCA9546A | NXP Semiconductors

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Four-Channel I²C-Bus Switch with Reset

PCA9546A Active

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 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 PCA9546A 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 (POR) function.

The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which is passed by the PCA9546A. 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 5 V tolerant.

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Block Diagram

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PCA9546A

PCA9546A Block Diagram

PCA9546ABS, PCA9546AD, PCA9546APW

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Features

Key Features

  • 1-of-4 bidirectional translating switches
  • I²C-bus interface logic; compatible with SMBus standards
  • Active LOW reset input
  • 3 address pins allowing up to 8 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 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

  • SO16, TSSOP16, and HVQFN16

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N true 0 PSPPCA9546Aen 13 Application Note Application Note t789 2 Brochure Brochure t518 1 Data Sheet Data Sheet t520 1 Fact Sheet Fact Sheet t523 1 Package Information Package Information t790 2 Packing Information Packing Information t935 2 Supporting Information Supporting Information t531 2 User Guide User Guide t792 2 en_US en_US en Data Sheet Data Sheet 1 1 6.0 English 1442067791308712175203 PSP 273.2 KB None None documents None 1442067791308712175203 /docs/en/data-sheet/PCA9546A.pdf 273232 /docs/en/data-sheet/PCA9546A.pdf PCA9546A documents N N 2014-04-30 4-channel I2C-bus switch with reset /docs/en/data-sheet/PCA9546A.pdf /docs/en/data-sheet/PCA9546A.pdf Data Sheet N 980000996212993340 2022-12-07 pdf N en Apr 30, 2014 980000996212993340 Data Sheet Y N 4-channel I2C-bus switch with reset Application Note Application Note 2 2 1.0 English Level shifting techniques in I2C-bus design 1442089228752700755238 PSP 53.7 KB Registration without Disclaimer None documents Extended 1442089228752700755238 /secured/assets/documents/en/application-note/AN10441.pdf 53707 /secured/assets/documents/en/application-note/AN10441.pdf AN10441 documents Y N 2016-07-11 AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note /webapp/Download?colCode=AN10441 /secured/assets/documents/en/application-note/AN10441.pdf Application Note N 645036621402383989 2024-07-12 pdf Y en Jun 20, 2007 645036621402383989 Application Note Y N AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note 3 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 2 4 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 5 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 Brochure Brochure 1 6 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 7 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 2 8 1.0 English 1455079748152709896565 PSP 191.3 KB None None documents None 1455079748152709896565 /docs/en/package-information/SOT629-1.pdf 191347 /docs/en/package-information/SOT629-1.pdf SOT629-1 documents N N 2016-02-12 plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm /docs/en/package-information/SOT629-1.pdf /docs/en/package-information/SOT629-1.pdf Package Information N 302435339416912908 2024-10-24 pdf N en Dec 8, 2021 302435339416912908 Package Information Y N plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm 9 1.2 English 1455079016613696797754 PSP 298.1 KB None None documents None 1455079016613696797754 /docs/en/package-information/SOT403-1.pdf 298149 /docs/en/package-information/SOT403-1.pdf SOT403-1 documents N N 2016-10-08 plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body /docs/en/package-information/SOT403-1.pdf /docs/en/package-information/SOT403-1.pdf Package Information N 302435339416912908 2024-10-24 pdf N en Dec 10, 2019 302435339416912908 Package Information Y N plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body PDF Packing Information Packing Information 2 10 1.0 English 1442131817357697408743 PSP 264.7 KB None None documents None 1442131817357697408743 /docs/en/packing/SOT629-1_118.pdf 264742 /docs/en/packing/SOT629-1_118.pdf SOT629-1_118 documents N N 2013-04-17 HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT629-1_118.pdf /docs/en/packing/SOT629-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 17, 2013 145666923842250347 Packing Information Y N HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 11 1.0 English 1442131582751712117334 PSP 223.6 KB None None documents None 1442131582751712117334 /docs/en/packing/SOT403-1_118.pdf 223589 /docs/en/packing/SOT403-1_118.pdf SOT403-1_118 documents N N 2013-04-17 TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT403-1_118.pdf /docs/en/packing/SOT403-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 8, 2013 145666923842250347 Packing Information Y N TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 Supporting Information Supporting Information 2 12 1.0 English Footprint for Wave Soldering 1442126382106720903168 PSP 8.3 KB None None documents None 1442126382106720903168 /docs/en/supporting-information/SO-SOJ-WAVE.pdf 8260 /docs/en/supporting-information/SO-SOJ-WAVE.pdf SO-SOJ-WAVE documents N N 2013-07-15 Footprint for Wave Soldering /docs/en/supporting-information/SO-SOJ-WAVE.pdf /docs/en/supporting-information/SO-SOJ-WAVE.pdf Supporting Information N 371282830530968666 2024-10-21 pdf N en Oct 8, 2009 371282830530968666 Supporting Information Y N Footprint for Wave Soldering 13 1.0 English Footprint for reflow soldering 1442122730480711091281 PSP 8.8 KB None None documents None 1442122730480711091281 /docs/en/supporting-information/SO-SOJ-REFLOW.pdf 8792 /docs/en/supporting-information/SO-SOJ-REFLOW.pdf SO-SOJ-REFLOW documents N N 2013-07-15 Footprint for reflow soldering /docs/en/supporting-information/SO-SOJ-REFLOW.pdf /docs/en/supporting-information/SO-SOJ-REFLOW.pdf Supporting Information N 371282830530968666 2024-10-21 pdf N en Oct 8, 2009 371282830530968666 Supporting Information Y N Footprint for reflow soldering false 0 PCA9546A downloads en true 1 Y PSP Y Y Application Note 2 /secured/assets/documents/en/application-note/AN10441.pdf 2016-07-11 1442089228752700755238 PSP 2 Jun 20, 2007 Application Note Level shifting techniques in I2C-bus design Registration without Disclaimer /secured/assets/documents/en/application-note/AN10441.pdf English documents 53707 None 645036621402383989 2024-07-12 Y /webapp/Download?colCode=AN10441 AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note /secured/assets/documents/en/application-note/AN10441.pdf documents 645036621402383989 Application Note N en Extended Y pdf 1.0 Y N AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note 53.7 KB AN10441 N 1442089228752700755238 /docs/en/application-note/AN262.pdf 2011-07-04 1442087835667690821743 PSP 3 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 1 /docs/en/brochure/75016529.pdf 2011-09-12 1442124653171725284460 PSP 6 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/PCA9546A.pdf 2014-04-30 1442067791308712175203 PSP 1 Apr 30, 2014 Data Sheet None /docs/en/data-sheet/PCA9546A.pdf English documents 273232 None 980000996212993340 2022-12-07 N /docs/en/data-sheet/PCA9546A.pdf 4-channel I2C-bus switch with reset /docs/en/data-sheet/PCA9546A.pdf documents 980000996212993340 Data Sheet N en None Y pdf 6.0 N N 4-channel I2C-bus switch with reset 273.2 KB PCA9546A N 1442067791308712175203 Fact Sheet 1 /docs/en/fact-sheet/PCA9xx-FactSheet.pdf 2019-05-10 1557513331449729197888 PSP 7 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 2 /docs/en/package-information/SOT629-1.pdf 2016-02-12 1455079748152709896565 PSP 8 Dec 8, 2021 Package Information None /docs/en/package-information/SOT629-1.pdf English documents 191347 None 302435339416912908 2024-10-24 N /docs/en/package-information/SOT629-1.pdf plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm /docs/en/package-information/SOT629-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm 191.3 KB SOT629-1 N 1455079748152709896565 /docs/en/package-information/SOT403-1.pdf 2016-10-08 1455079016613696797754 PSP 9 Dec 10, 2019 Package Information PDF None /docs/en/package-information/SOT403-1.pdf English documents 298149 None 302435339416912908 2024-10-24 N /docs/en/package-information/SOT403-1.pdf plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body /docs/en/package-information/SOT403-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.2 N N plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body 298.1 KB SOT403-1 N 1455079016613696797754 Packing Information 2 /docs/en/packing/SOT629-1_118.pdf 2013-04-17 1442131817357697408743 PSP 10 Apr 17, 2013 Packing Information None /docs/en/packing/SOT629-1_118.pdf English documents 264742 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT629-1_118.pdf HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT629-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 1.0 N N HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 264.7 KB SOT629-1_118 N 1442131817357697408743 /docs/en/packing/SOT403-1_118.pdf 2013-04-17 1442131582751712117334 PSP 11 Apr 8, 2013 Packing Information None /docs/en/packing/SOT403-1_118.pdf English documents 223589 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT403-1_118.pdf TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT403-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 1.0 N N TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 223.6 KB SOT403-1_118 N 1442131582751712117334 Supporting Information 2 /docs/en/supporting-information/SO-SOJ-WAVE.pdf 2013-07-15 1442126382106720903168 PSP 12 Oct 8, 2009 Supporting Information Footprint for Wave Soldering None /docs/en/supporting-information/SO-SOJ-WAVE.pdf English documents 8260 None 371282830530968666 2024-10-21 N /docs/en/supporting-information/SO-SOJ-WAVE.pdf Footprint for Wave Soldering /docs/en/supporting-information/SO-SOJ-WAVE.pdf documents 371282830530968666 Supporting Information N en None Y pdf 1.0 N N Footprint for Wave Soldering 8.3 KB SO-SOJ-WAVE N 1442126382106720903168 /docs/en/supporting-information/SO-SOJ-REFLOW.pdf 2013-07-15 1442122730480711091281 PSP 13 Oct 8, 2009 Supporting Information Footprint for reflow soldering None /docs/en/supporting-information/SO-SOJ-REFLOW.pdf English documents 8792 None 371282830530968666 2024-10-21 N /docs/en/supporting-information/SO-SOJ-REFLOW.pdf Footprint for reflow soldering /docs/en/supporting-information/SO-SOJ-REFLOW.pdf documents 371282830530968666 Supporting Information N en None Y pdf 1.0 N N Footprint for reflow soldering 8.8 KB SO-SOJ-REFLOW N 1442122730480711091281 User Guide 2 /docs/en/user-guide/UM10204.pdf 2016-07-12 1442125286808710770774 PSP 4 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 5 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 true Y Products

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