The MCP23S08 is an 8-bit I/O expander with serial interface. This device offers 8-bit, general purpose, parallel I/O expansion for SPI applications. It has two hardware address pins and uses SPI ...
The MCP23017, a 16-bit I2C GPIO expander, has always been a tasty chip. With 16 GPIOs addressable over I2C, proper push/pull outputs, software-enabled pull-ups, eight addresses, maskable interrupts ...
The PCA9502 is an 8-bit I/O expander with I²C-bus/SPI host interface. The device comes in a very small HVQFN24 package, which makes it ideally suitable for hand-held, battery operated applications.