PCA9546A
4-CHANNEL I2C AND SMBus SWITCH
WITH RESET FUNCTION
www.ti.com
SCPS148D–OCTOBER 2005–REVISED OCTOBER 2006
FEATURES
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1-of-4 Bidirectional Translating Switches
I2C Bus and SMBus Compatible
Active-Low Reset Input
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Supports Hot Insertion
Low Standby Current
Operating Power-Supply Voltage Range of
2.3 V to 5.5 V
Three Address Pins, Allowing up to Eight
Devices on the I2C Bus
Channel Selection Via I2C Bus
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5.5-V Tolerant Inputs
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0 to 400-kHz Clock Frequency
Power Up With All Switch Channels
Deselected
Latch-Up Performance Exceeds 100 mA Per
JESD 78
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Low RON Switches
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ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
Allows Voltage-Level Translation Between
1.8-V, 2.5-V, 3.3-V, and 5-V Buses
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No Glitch on Power Up
– 1000-V Charged-Device Model (C101)
DESCRIPTION/ORDERING INFORMATION
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 SCn/SDn channel or combination of channels can
be selected, determined by the contents of the programmable control register.
An active-low reset (RESET) input allows the PCA9546A to recover from a situation in which one of the
downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all
the channels to be deselected, as does the internal power-on reset function.
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
PCA9546ARVR
PCA9546ARGYR
PCA9546AD
TOP-SIDE MARKING
PREVIEW
QFN – RGV
QFN – RGY
Reel of 2500
Reel of 1000
Tube of 40
PD546A
PCA9546ADG4
PCA9546ADR
SOIC – D
Reel of 2500
Reel of 250
PCA9546A
PCA9546ADRG4
PCA9546ADT
PCA9546ADTG4
PCA9546ADW
Tube of 40
Reel of 2000
Reel of 250
PCA9546A
PREVIEW
–40°C to 85°C
SOIC – DW
PCA9546ADWR
PCA9546ADWT
PCA9546APW
Tube of 90
Reel of 2000
Reel of 250
PCA9546APWE4
PCA9546APWR
PCA9546APWRE4
PCA9546APWT
PCA9546APWTE4
PCA9546ADGVR
PCA9546ADGVT
TSSOP – PW
TVSOP – DGV
PD546A
Reel of 2000
Reel of 250
PD546A
PREVIEW
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.