PCA9546ADR ,4-Channel I2C And SMBus Switch With Reset Functions 16-SOIC -40 to 85 SCPS148G–OCTOBER 2005–REVISED MAY 20165 Pin Configuration and FunctionsRGV PACKAGERGY PACKAGE(TOP ..
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PCA9546APW ,4-channel I2C-bus switch with resetMaximum Ratings . 410 Power Supply Recommendations... 196.2 ESD Ratings ...... 410.1 Power-On Reset ..
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PCA9546A-PCA9546ADG4-PCA9546ADGVR-PCA9546ADR-PCA9546ADWR-PCA9546APW-PCA9546APWR-PCA9546ARGVR-PCA9546ARGYR
4-Channel I2C And SMBus Switch With Reset Functions 16-SOIC -40 to 85
SlavesA0,A1...AN
Slaves B0, B1...BN
Slaves C0, C1...CN
I2C or SMBus
Master
(e.g. Processor)
SDA
SCL
SD0
SC0
Channel 0
Channel 1
Channel 3
RESET SD1
SC1
SD3
VCC
GND
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PCA9546ASCPS148G –OCTOBER 2005–REVISED MAY 2016
PCA9546A Low Voltage 4-ChannelI2C and SMBus Switch with Reset Function Features 1-of-4 Bidirectional Translating SwitchesI2C Bus and SMBus Compatible Active-Low Reset Input Three Address Pins, Allowingupto Eight
PCA9546A Deviceson theI2C Bus Channel Selection ViaI2C Bus,in Any
Combination Power-up WithAll 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 Glitchon Power-up Supports Hot Insertion Low Standby Current Operating Power-Supply Voltage Rangeof 2.3V 5.5V 5.5V Tolerant Inputs 0to 400-kHz Clock Frequency Latch-Up Performance Exceeds 100 mA Per
JESD78 ESD Protection Exceeds JESD22 2000-V Human-Body Model (A114-A) 1000-V Charged-Device Model (C101)
(1) Forall available packages, seethe orderable addendumat
the endofthe datasheet.
Applications Servers Routers (Telecom Switching Equipment) Factory Automation Products WithI2C Slave Address Conflicts
(for example. Multiple, Identical Temp Sensors)
DescriptionThe PCA9546Aisa quad bidirectional translating
switch controlled via theI2C bus. The SCL/SDA
upstream pair fans outto four downstream pairs,or
channels. Any individual SCn/SDn channel or
combinationof channels can be selected, determined the contentsof the programmable control register. active-low reset (RESET) input allows the
PCA9546Ato recover froma situationin which oneof
the downstreamI2C busesis stuckina low state.
Pulling RESET low resets theI2C state machine and
causesall the channelsto be deselected,as does the
internal power-on reset function.
The pass gatesof the switches are constructed such
that the VCC pin can be usedto limit the maximum
high voltage, which willbe passedby the PCA9546A.
This allows the useof different bus voltages on each
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 the desired voltage level for each channel. All I/O
pins are 5.5-V tolerant.
Device Information(1)
Simplified Application Diagram
