Diodes Incorporated
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8-Channel I2C/SMBus Bus Mux

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The PI4MSD5V9547 is an octal bidirectional translating multiplexer controlled by the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels.
Only one SCx/SDx channel can be selected at a time, determined by the contents of the programmable control register. The device powers up with Channel 0 connected, allowing immediate communication between the master and downstream devices on that channel.
An active LOW reset input allows the PI4MSD5V9547 to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and causes all the channels to be deselected as does the internal Power-On Reset (POR) function.
The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage which is passed by the PI4MSD5V9547. This allows the use of different bus voltages on each pair, so that 1.2V, 1.8 V or 2.5 V or 3.3 V parts can communicate with 5V 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.


  • 1-of-8 bidirectional translating multiplexer
  • I²C-bus interface logic
  • Operating power supply voltage from 1.65V to 5.5V
  • Allows voltage level translation between 1.2V, 1.8V, 2.5V, 3.3V and 5V buses
  • Low standby current
  • Low Ron switches
  • Active LOW reset input
  • Channel selection via I2C bus
  • Power-up with one channel on
  • Capacitance isolation when channel disabled
  • No glitch on power-up
  • Supports hot insertion
  • 5 V tolerant inputs
  • 0 Hz to 400 kHz clock frequency
  • ESD protection exceeds 8000 V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Packages offered: TSSOP-24L,TQFN-24ZD

Product Specifications

Product Parameters

Ambient or Junction Temperature (°C) -40 to 85
Analog or Digital? Digital
Voltage 1.65V/5.5V
Single Ended Channels 8
Signal Type Single Ended
Configuration Multiplexer,8-channel, 2:1
RailToRail 0
HotInsertion 1

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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