MCP23S17 16 Bit Input/Output Expander with I2C Interface IC DIP 18 Package

MCP23S17 16 Bit Input/Output Expander with I2C Interface IC DIP 18 Package 

The MCP23S17 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 SPI serial interface. It provides two independent 8-bit ports (PORTA and PORTB), each individually configurable as inputs or outputs.

The device includes internal pull-up resistors, interrupt-on-change capability, and configurable polarity inversion, making it highly flexible for both input sensing and output control. Packaged in a DIP-18 through-hole package, the MCP23S17 is ideal for prototyping, development boards, and industrial control applications.

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Features

• 16 configurable GPIO pins (2 × 8-bit ports)
• SPI interface with high-speed operation
• Individual pin direction control (input or output)
• Internal pull-up resistors on input pins
• Interrupt-on-change support for inputs
• Polarity inversion capability
• Multiple device addressing for SPI bus expansion
• Low power consumption
• Wide operating voltage range
• DIP-18 package for easy prototyping and PCB mounting

Applications

• GPIO expansion for microcontrollers
• Embedded systems with limited I/O pins
• Keypad and switch matrix interfacing
• LED, relay, and actuator control
• Industrial automation systems
• Robotics and control panels
• Home automation projects
• Development and educational platforms

mcp23S17-ic-datasheet