PCA9544A_07 Datasheet, PDF (1/27 Pages) Texas Instruments – 4-CHANNEL I2C AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC

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FEATURES
• 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 R_ON 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
PCA9544A
4-CHANNEL I²C AND SMBus MULTIPLEXER
WITH INTERRUPT LOGIC
SCPS146C – OCTOBER 2005 – REVISED OCTOBER 2006
• 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)
DESCRIPTION/ORDERING INFORMATION
The PCA9544A is a quad bidirectional translating switch 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 V_CC 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
pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.
T_A
–40°C to 85°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
TOP-SIDE MARKING
QFN – RGW
Reel of 3000
PCA9544ARGWR
PREVIEW
QFN – RGY
Reel of 1000
PCA9544ARGYR
PD544A
SOIC – DW
Tube of 25
Reel of 2000
PCA9544ADW
PCA9544ADWR
PCA9544A
Reel of 250
PCA9544ADWT
PREVIEW
Tube of 70
PCA9544APW
TSSOP – PW
Reel of 2000
PCA9544APWR
PD544A
Reel of 250
PCA9544APWT
TVSOP – DGV
Reel of 2000
Reel of 250
PCA9544ADGVR
PCA9544ADGVT
PD544A
PREVIEW
VFBGA – GQN
Reel of 1000
PCA9544AGQNR
PD544A
VFBGA – ZQN (Pb-free) Reel of 1000
PCA9544AZQNR
PD544A
(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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2006, Texas Instruments Incorporated