SMBus Switch. PCA9546A Datasheet

PCA9546A Switch. Datasheet pdf. Equivalent

Part PCA9546A
Description Low Voltage 4-Channel I2C and SMBus Switch
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PCA9546A
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PCA9546A
SCPS148G – OCTOBER 2005 – REVISED MAY 2016
PCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function
1 Features
1 1-of-4 Bidirectional Translating Switches
• I2C Bus and SMBus Compatible
• Active-Low Reset Input
• Three Address Pins, Allowing up to Eight
PCA9546A 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
• 5.5 V Tolerant Inputs
• 0 to 400-kHz Clock Frequency
• Latch-Up Performance Exceeds 100 mA Per
JESD 78
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)
2 Applications
• Servers
• Routers (Telecom Switching Equipment)
• Factory Automation
• Products With I2C Slave Address Conflicts
(for example. Multiple, Identical Temp Sensors)
3 Description
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.
The pass gates of the switches are constructed such
that the VCC pin can be used to limit the maximum
high voltage, which will be passed by the PCA9546A.
This allows the use of 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
to the desired voltage level for each channel. All I/O
pins are 5.5-V tolerant.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PCA9546A
TSSOP (16)
5.00 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Application Diagram
I2C or SMBus
Master
(e.g. Processor)
SDA
SCL
VCC
RESET
PCA9546A
A0
A1
A2
GND
Channel 0
SD0
SC0
Channel 1
SD1
SC1
Channel 2
SD2
SC2
Channel 3
SD3
SC3
Slaves A0, A1...AN
Slaves B0, B1...BN
Slaves C0, C1...CN
Slaves D0, D1...DN
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



PCA9546A
PCA9546A
SCPS148G – OCTOBER 2005 – REVISED MAY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 ESD Ratings ............................................................ 4
6.3 Recommended Operating Conditions ...................... 4
6.4 Electrical Characteristics........................................... 5
6.5 I2C Interface Timing Requirements.......................... 5
6.6 Interrupt and Reset Timing Requirements ................ 7
6.7 Switching Characteristics .......................................... 7
7 Parameter Measurement Information .................. 8
8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 10
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 11
8.5 Programming........................................................... 11
8.6 Control Register ...................................................... 14
9 Application and Implementation ........................ 15
9.1 Application Information............................................ 15
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 19
10.1 Power-On Reset Errata......................................... 19
11 Layout................................................................... 19
11.1 Layout Guidelines ................................................. 19
11.2 Layout Example .................................................... 20
12 Device and Documentation Support ................. 20
12.1 Electrostatic Discharge Caution ............................ 20
12.2 Glossary ................................................................ 20
13 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (April 2014) to Revision G
Page
• Revised pack material addendum; pin 1 quadrant .............................................................................................................. 20
Changes from Revision E (January 2008) to Revision F
Page
• Added RESET Errata section. .............................................................................................................................................. 11
• Added Power-On Reset Errata section. ............................................................................................................................... 19
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