SMBus Multiplexer. PCA9544A Datasheet

PCA9544A Multiplexer. Datasheet pdf. Equivalent

Part PCA9544A
Description Low Voltage 4-Channel I2C and SMBus Multiplexer
Feature Product Folder Order Now Technical Documents Tools & Software Support & Community PCA9544A SCPS.
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Total Page 30 Pages
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PCA9544A
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PCA9544A
SCPS146F – OCTOBER 2005 – REVISED AUGUST 2019
PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic
1 Features
1 1-of-4 Bidirectional translating switches
• I2C Bus and SMBus compatible
• Four active-low interrupt inputs
• Active-low interrupt output
• Three address pins, allowing up to eight devices
on the I2C Bus
• Channel selection via I2C Bus
• 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)
– 200-V Machine model (A115-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 PCA9544A is a 4-channel, bidirectional
translating multiplexer controlled via the I2C bus. The
SCL/SDA upstream pair fans out to four downstream
pairs, or channels. One SCL/SDA pair can be
selected at a time, and this is determined by the
contents of the programmable control register. Four
interrupt inputs (INT3–INT0), one for each of the
downstream pairs, are provided. One interrupt output
(INT) acts as an AND of the four interrupt inputs.
A power-on reset function puts the registers in their
default state and initializes the I2C state machine,
with no channel selected.
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 PCA9544A.
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-V tolerant.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TVSOP (DGV) (20) 5.00 mm x 4.40 mm
PCA9544A
SOIC (DW) (20)
TSSOP (PW) (20)
12.8 mm x 7.50 mm
6.50 mm × 4.40 mm
VQFN (RGY) (20) 4.50 mm x 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
I2C or SMBus
Master
(e.g. µProcessor)
SDA
SCL
INT
VCC
PCA9544A
A0
A1
A2
GND
Channel 0
SD0
SC0
INT0
SD1 Channel 1
SC1
INT1
SD2 Channel 2
SC2
INT2
SD3 Channel 3
SC3
INT3
Slaves A0, A1...AN
Slaves B0, B1...BN
Slaves B0, B1...BN
Slaves B0, B1...BN
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.



PCA9544A
PCA9544A
SCPS146F – OCTOBER 2005 – REVISED AUGUST 2019
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 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 I2C Interface Timing Requirements........................... 6
6.7 Switching Characteristics .......................................... 6
6.8 Interrupt Timing Requirements ................................. 6
7 Parameter Measurement Information .................. 7
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 10
8.5 Programming .......................................................... 10
8.6 Register Map........................................................... 12
9 Application and Implementation ........................ 15
9.1 Application Information............................................ 15
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 18
10.1 Power-On Reset Errata......................................... 18
11 Layout................................................................... 18
11.1 Layout Guidelines ................................................. 18
11.2 Layout Example .................................................... 19
12 Device and Documentation Support ................. 20
12.1 Receiving Notification of Documentation Updates 20
12.2 Community Resources.......................................... 20
12.3 Trademarks ........................................................... 20
12.4 Electrostatic Discharge Caution ............................ 20
12.5 Glossary ................................................................ 20
13 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
Changes from Revision E (June 2014) to Revision F
Page
• Changed text From: "The PCA9544A is a quad bidirectional translating switch" To: "The PCA9544A is a 4-channel,
bidirectional translating multiplexer" in the Description .......................................................................................................... 1
• Changed the Device Information table ................................................................................................................................... 1
• Deleted the RGW, GQN, and ZQN packages from the Pin Configuration and Functions section......................................... 3
• Moved Tstg to the Absolute Maximum Ratings ....................................................................................................................... 4
• Changed the Handling Ratings table to ESD Ratings table ................................................................................................... 4
• Added the Thermal Information table ..................................................................................................................................... 4
• Changed the first paragraph of the Overview section ............................................................................................................ 8
• Changed text From: "bidirectional translating switch" To: "bidirectional translating multiplexer" ......................................... 10
• Changed text from: "One or several SCn/SDn downstream pairs or channels, are selected" To: "Only one SCn/SDn
downstream pair, or channel, can be selected" in the Control Register Definition section.................................................. 13
• Deleted sentence: "If multiple switches will be enabled.." from the second paragraph of the Application Information
section .................................................................................................................................................................................. 15
Changes from Revision D (February 2008) to Revision E
Page
• Added Power-On Reset Errata section. .............................................................................................................................. 18
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