TCA9544A 4-Channel I2C and SMBus Multiplexer With Interrupt Logic |


4-Channel I2C and SMBus Multiplexer With Interrupt Logic



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 (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 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.


  • 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 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 1.65 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
    • 4000-V Human-Body Model (A114-A)
    • 1500-V Charged-Device Model (C101)

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Part number Order Channels (#) VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) Addresses Features Operating temperature range (C) Package Group
TCA9544A Order now 4     1.65     5.5     400     8     Interrupt Pin     -40 to 85     TSSOP | 20    
TCA9543A Order now 2     1.65     5.5     400     4     Interrupt Pin
Reset Pin    
-40 to 85     SOIC | 14
TSSOP | 14    
TCA9545A Order now 4     1.65     5.5     400     4     Interrupt Pin
Reset Pin    
-40 to 85     TSSOP | 20    
TCA9546A Order now 4     1.65     5.5     400     8     Reset Pin     -40 to 85     SOIC | 16
TSSOP | 16