MICROCHIP MCP23008/MCP23S08 handbook
Datasheet
This document is the user manual of Microchip MCP23008/MCP23S08 products, which introduces the features and characteristics of the products, including 8-bit remote bidirectional I/O port, high-precision I2C/SPI interface, hardware address pins, interrupt output pin, configurable interrupt source, polarity inversion register, external reset pin, low standby current, operating voltage, etc.