Four-Channel I2C-Bus Switch with Reset

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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.

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Data Sheet

Application Notes

Product Details

Block Diagram

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PCA9546A Block Diagram
Block diagram: PCA9546ABS, PCA9546AD, PCA9546APW

PCA9546A Block Diagram

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

Product Longevity Program

This product is included in NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The PCA9546APW is included in the 15-year program

Buy/Parametrics

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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
PCA9546A IBIS model

ZIPRev 1.0Sep 2, 2014 00:00:0044.5 KBPCA9546A_1
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Symbols and Footprints
PCA9546AD-SO16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0050.4 KBPCA9546AD-SO16-BXL
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Symbols and Footprints
PCA9546ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0050.4 KBPCA9546ABS-HVQFN16-BXL
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Symbols and Footprints
PCA9546APW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 13:45:0038.6 KBPCA9546APW-TSSOP16-BXL
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Other NXP Products

Four-Channel I²C-Bus Switch with Reset

Product Details

Block Diagram

PCA9546A Block Diagram

Block diagram: PCA9546ABS, PCA9546AD, PCA9546APW

Features

Key Features

Packages Offered

Product Longevity Program

Buy/Parametrics

Documentation

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4-channel I2C-bus switch with reset

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

AN262

I2C-bus specification and user manual

PCA9632 demonstration board OM13269

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

PCA9XX FactSheet

plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm

plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body

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

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

Footprint for Wave Soldering

Footprint for reflow soldering

Design Resources

Design Files

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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

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