Features
16-bit remote bidirectional I/O port- I/O pins default to input
High-speed I2C interface (MCP23017)- 100 kHz- 400 kHz-1.7MHz
High-speed SPI interface (MCP23S17)- 10 MHz (max.)
Three hardware address pins to allow up to eight devices on the bus
Configurable interrupt output pins- Configurable as active-high, active-low or open-drain
INTA and INTB can be configured to operate independently or together
Configurable interrupt source- Interrupt-on-change from configured register defaults or pin changes
Polarity Inversion register to configure the polarity of the input port data External Reset input
Low standby current: 1 μA (max.)
Operating voltage:- 1.8V to 5.5V @ -40°C to +85°C- 2.7V to 5.5V @ -40°C to +85°C- 4.5V to 5.5V @ -40°C to +125°C

Packages
28-pin PDIP (300 mil)
28-pin SOIC (300 mil)
28-pin SSOP
28-pin QFN