MICROCHIP MCP23008-E/SO 8-Bit I/O Expander, 1.7MHz, 1.8-5.5V, 18-Pin SOIC

The MICROCHIP MCP23008-E/SO is a versatile 8-bit input/output expander integrated circuit designed to provide seamless parallel I/O expansion for I²C bus applications. It is presented in a compact 18-lead SOIC package, making it an ideal solution for space-constrained electronic designs.

This device offers a high-speed I²C serial interface, with a maximum bus frequency of 1.7MHz, ensuring fast and efficient communication between the system master and the expander. It features a wide supply voltage range from 1.8V to 5.5V, providing excellent compatibility with various logic levels and power supplies, from low-power microcontrollers to standard 5V systems.

Key functionalities include three hardware address pins, allowing up to eight identical devices to share the same I²C bus, significantly expanding the number of available I/O lines for complex projects. The interrupt output pin is highly configurable, supporting active-high, active-low, or open-drain operation, and the interrupt source itself is configurable for flexible system event handling.

The MCP23008 operates with a remarkably low standby current of just 1µA (maximum), making it perfectly suited for battery-powered and energy-sensitive applications. Its robust design supports an operating temperature range from -40°C to 125°C, ensuring reliable performance in harsh industrial and automotive environments.

Internally, the chip provides multiple 8-bit configuration registers that allow the system master to individually set each of the eight I/O pins as an input or an output. The data state for each pin is stored in corresponding input or output registers, and an inversion register allows the logical polarity of the input port to be inverted, simplifying signal conditioning.

With its combination of high speed, low power consumption, wide voltage range, and extensive temperature tolerance, the MCP23008-E/SO is a reliable and flexible choice