Diodes Incorporated
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8-bits IO expander with 1MHz I2C

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The PI4IOE5V9557 provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2Cbus/SMBus applications. It includes the features such as higher driving capability, 5V tolerance, lower power supply, individual I/O configuration, and smaller packaging. It provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc. The PI4IOE5V9557 consists of an 8-bit register to configure the I/Os as either inputs or outputs, and an 8- bit polarity register to change the polarity of the input port register. The data for each input or output is kept in the corresponding Input port or Output port register. All registers can be read by the system master.

The power-on reset sets the registers to their default values and initializes the device state machine. The RESET pin causes the same reset/default I/O input configuration to occur without de-powering the device, holding the registers and I2C-bus state machine in their default state until the RESET input is once again HIGH.

Three hardware pins (A0, A1, A2) vary the fixed I 2C-bus address and allow up to eight devices to share the same I2C-bus/SMBus.


  • Operation power supply voltage from 2.3V to 5.5V
  • 8-bit I2C-bus GPIO with interrupt and reset
  • 5V tolerant I/Os
  • Polarity inversion register
  • Active LOW Reset Pin
  • Low current consumption
  • 0Hz to 400KHz clock frequency
  • Noise filter on SCL/SDA inputs
  • Power-on reset
  • ESD protection (4KV HBM and 1KV CDM)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. "Green" Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAGP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative.


  • Packaging (Pb-free & Green available):
    • 16-pin, 173mil wide, TSSOP (L)

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Analog or Digital? Digital
Voltage 2.2V/5V
Single Ended Channels 8
Signal Type Single Ended
Configuration 8 bits
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques


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

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2493 2020-12-28 2021-03-28 Qualified Additional A/T Sites and Bill of Materials (BOM)