Product details

Addresses 8 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.3 Features Interrupt Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 4
Addresses 8 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.3 Features Interrupt Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 4
SOIC (DW) 20 132 mm² 12.8 x 10.3 TSSOP (PW) 20 29 mm² 6.5 x 4.4 TSSOP (PW) 20 29 mm² 4.4 x 6.5 TVSOP (DGV) 20 32 mm² 5 x 6.4 VQFN (RGY) 20 16 mm² 3.5 x 4.5
  • 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)
  • 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)

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 ( INT3INT0), 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.

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 ( INT3INT0), 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.

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Technical documentation

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Type Title Date
* Data sheet PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. G) 11 Mar 2021
Application note I2C Solutions for Hot Swap Applications 31 Jan 2020
Application note I2C Dynamic Addressing 25 Apr 2019
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Choosing the Correct I2C Device for New Designs 07 Sep 2016
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 13 Feb 2015
Application note Troubleshooting I2C Bus Protocol 19 Oct 2009
Application note Programming Fun Lights With TI's TCA6507 30 Nov 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004

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SOIC (DW) 20 View options
TSSOP (PW) 20 View options
TVSOP (DGV) 20 View options
VQFN (RGY) 20 View options

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