TCA9544A data sheet, product information and support (2024)

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4-channel 1.65- to 5.5-V I2C/SMBus multiplexer with interrupt & voltage translation

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Data sheet

document-pdfAcrobat TCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. C) PDF | HTML

TCA9544A

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Data sheet

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Product details

Addresses 8 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 1.65 Features Interrupt pin Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85 Number of channels 4

TSSOP (PW)

41.6 mm² 6.5 x 6.4

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 TCA9544A 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
Low Standby Current
Operating Power Supply Voltage Range of 1.65Vto5.5V
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
- 4000-V Human-Body Model (A114-A)
- 1500-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 TCA9544A 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
Low Standby Current
Operating Power Supply Voltage Range of 1.65Vto5.5V
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
- 4000-V Human-Body Model (A114-A)
- 1500-V Charged-Device Model (C101)

The TCA9544A is a 4-channel, bidirectional translating I2C Muliplexer. The master SCL/SDA signal pair is directed to one of the four channels of slave devices, SC0/SD0-SC3/SD3. 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 returns the registers to their default state and initializes the I²C state machine, with all channels deselected.

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 TCA9544A. 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.

A power-on reset function returns the registers to their default state and initializes the I²C state machine, with all channels deselected.

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	Type	Title		Date
*	Data sheet	TCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic datasheet (Rev. C)	PDF \| HTML	29 Oct 2019
	Application note	I2C Solutions for Hot Swap Applications (Rev. A)		31 Jan 2023
	Application note	I2C Dynamic Addressing		25 Apr 2019
	Application note	Choosing the Correct I2C Device for New Designs	PDF \| HTML	07 Sep 2016
	Selection guide	I2C Infographic Flyer		03 Dec 2015
	Application note	Understanding the I2C Bus	PDF \| HTML	30 Jun 2015
	Application note	Maximum Clock Frequency of I2C Bus Using Repeaters		15 May 2015
	Application note	I2C Bus Pull-Up Resistor Calculation	PDF \| HTML	13 Feb 2015

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