MCP23017 16 Bit Input/Output Expander with I2C Interface IC DIP 28 Package

MCP23017 16 Bit Input/Output Expander with I2C Interface IC DIP 28 Package

The MCP23017 is a 16-bit digital input/output (I/O) expander IC that allows a microcontroller to easily increase its number of GPIO pins using an I²C serial interface. It provides two independent 8-bit ports (PORTA and PORTB), each of which can be individually configured as inputs or outputs.

The device features internal pull-up resistors, interrupt-on-change capability, and polarity inversion, making it highly flexible for interfacing with switches, keypads, LEDs, relays, and other digital devices. Packaged in a DIP-28 through-hole package, the MCP23017 is ideal for prototyping, development boards, and industrial control applications.

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Features

• 16 configurable GPIO pins (2 × 8-bit ports)
• I²C interface with selectable device addresses
• Individual pin direction control (input or output)
• Internal pull-up resistors for input pins
• Interrupt-on-change support for input pins
• Polarity inversion capability
• Supports multiple devices on the same I²C bus
• Low power consumption
• Wide operating voltage range
• DIP-28 package for easy PCB mounting and prototyping

Applications

• GPIO expansion for microcontrollers
• Embedded systems with limited I/O pins
• Keypad and switch matrix interfacing
• LED and display control
• Relay and actuator driving
• Industrial automation systems
• Robotics and control panels
• Home automation projects

mcp23017-ic-datasheet