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MCP23009 Series 5.5 V 3.4 MHz 8-Bit I/O Expander with Open-Drain Output - QFN-16

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Mfr. Name: Microchip
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Product Specification Section
Microchip MCP23009-E/MG - Technical Attributes
Attributes Table
Interface Circuit Type: I2C
No of Channels: 1
Clock Frequency-Max: 3.4MHz
No of I/O Lines: 8
Supply Voltage-Nom: 1.8V to 5.5V
Supply Current: 1mA
Package Style:  QFN-16
Mounting Method: Surface Mount
Features & Applications

Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Microchip offers a broad spectrum of analog products with a focus on power management, thermal management, linear and mixed-signal solutions.

The MCP23X09 device provides 8-bit, general purpose parallel I/O expansion for I2C bus or SPI applications. The two devices differ only in the serial interface. MCP23009 - I2C interface and MCP23S09 - SPI interface. The MCP23X09 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the input port register can be inverted with the polarity inversion register. All registers can be read by the system master. 


  • 8-bit remote bidirectional I/O port
    I/O pins default to input
  • Open-drain outputs
    5.5V tolerant
    25 mA sink
    200 mA total
  • Low standby current as low as 1 μA
  • High-speed I2C™ interface: 100 kHz, 400 kHz,3.4MHz
  • Single hardware address pin: Voltage input to allow up to eight devices on the bus
  • Configurable interrupt output pins: Configurable as active-high, active-low or open-drain
  • Configurable interrupt source: Interrupt-on-change from configured defaults or pin change
  • External reset input
  • Polarity inversion register to configure the polarity of the input port dataet input
The MCP23009-E/MG comes in a 3x3 QFN-16 packaging and is available in small quantities.
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52 Weeks
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