Four-Channel I2C-Bus Switch with Reset

PCA9546A | NXP Semiconductors

For best experience this site requires Javascript to be enabled. To enable on your browser, follow our accessibility instructions.

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 V_DD 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.

See product image

Data Sheet

Application Notes

Product Details

Block Diagram

Choose a diagram:

PCA9546A
PCA9546ABS, PCA9546AD, PCA9546APW

PCA9546A

PCA9546ABS, PCA9546AD, PCA9546APW

Get diagram PDF

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

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

‌ ‌ ‌	‌ ‌	‌ ‌	‌ ‌	‌ ‌	‌ ‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌
‌ ‌ ‌	‌	‌	‌	‌	‌

Design Resources

Design Files

Quick reference to our design files types.

4 design files

Models
PCA9546A IBIS model

ZIPRev 1.0Sep 2, 201444.5 KBPCA9546A_1
DownloadToggle Dropdown
- Add to Queue
- Remove from Queue
- Recommended for large file sizes.
- View Queue
Symbols and Footprints
PCA9546AD-SO16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 202050.4 KBPCA9546AD-SO16-BXL
DownloadToggle Dropdown
- Add to Queue
- Remove from Queue
- Recommended for large file sizes.
- View Queue
Symbols and Footprints
PCA9546ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 202050.4 KBPCA9546ABS-HVQFN16-BXL
DownloadToggle Dropdown
- Add to Queue
- Remove from Queue
- Recommended for large file sizes.
- View Queue
Symbols and Footprints
PCA9546APW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 202038.6 KBPCA9546APW-TSSOP16-BXL
DownloadToggle Dropdown
- Add to Queue
- Remove from Queue
- Recommended for large file sizes.
- View Queue

Support

What do you need help with?

Recommended Communities

Other NXP Products

Shopping cart

Four-Channel I²C-Bus Switch with Reset

Product Details

Block Diagram

PCA9546A

PCA9546ABS, PCA9546AD, PCA9546APW

Features

Key Features

Packages Offered

Product Programs

Product Longevity

Buy/Parametrics

Documentation

Filter by

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)

PCA9546A, 4-Channel I2C-Bus Switch With Reset Data Sheet[PCA9546A]

Fact Sheet (1)

PCA9XX FactSheet[PCA9XX-FACTSHEET]

Package Information (2)

plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm[SOT629-1]

plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body[SOT403-1]

Packing Information (2)

HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT629-1_118]

TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT403-1_118]

Supporting Information (2)

Footprint for Wave Soldering[SO-SOJ-WAVE]

Footprint for reflow soldering[SO-SOJ-REFLOW]

User Guide (2)

I2C-bus specification and user manual[UM10204]

PCA9632 demonstration board OM13269[UM10528]

Filter by

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)

PCA9546A, 4-Channel I2C-Bus Switch With Reset Data Sheet[PCA9546A]

Fact Sheet (1)

PCA9XX FactSheet[PCA9XX-FACTSHEET]

Package Information (2)

plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm[SOT629-1]

plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body[SOT403-1]

Packing Information (2)

HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT629-1_118]

TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT403-1_118]

Supporting Information (2)

Footprint for Wave Soldering[SO-SOJ-WAVE]

Footprint for reflow soldering[SO-SOJ-REFLOW]

User Guide (2)

I2C-bus specification and user manual[UM10204]

PCA9632 demonstration board OM13269[UM10528]

Design Resources

Design Files

Filter by

PCA9546A IBIS model

PCA9546AD-SO16-CAD Symbol and PCB Footprint – BXL File

PCA9546ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

PCA9546APW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

Filter by

Filter By

PCA9546A IBIS model

PCA9546AD-SO16-CAD Symbol and PCB Footprint – BXL File

PCA9546ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

PCA9546APW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

Support

What do you need help with?

Recommended Communities

Recently viewed products