Diodes Incorporated
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4-bits IO expander

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Product Description

The PI4IOE5V9537 provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I 2C-bus/ 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 PI4IOE5V9537 consists of a 4-bit register to configure the I/Os as either inputs or outputs, and a 4- bit polarity register to change the polarity of the input port register data. 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 PI4IOE5V9537 open-drain interrupt output (INT) is activated when any input state and is used to indicate the system master that an input state has changed. The power-on reset sets the registers to their default values and initializes the device state machine. The Reset pin causes the same reset/initialization to occur without de-powering the device.


  • Operation power supply voltage from 2.3V to 5.5V
  • 4-bit I2C-bus GPIO with interrupt and reset
  • 5V tolerant I/Os
  • Active Low interrupt output
  • Active Low reset input
  • Polarity inversion register
  • Low current consumption
  • 0Hz to 1MHz clock frequency
  • Noise filter on SCL/SDA inputs
  • Power-on reset
  • ESD protection (4KV HBM and 1KV CDM) Package offered: MSOP-10L

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Analog or Digital? Digital
Voltage 2.2V/5V
Single Ended Channels 4
Signal Type Single Ended
Configuration 4 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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