MCP23S08 Port Chip

Web page on digikey: http://www.digikey.com/product-detail/en/microchip-technology/MCP23S08-E-P/MCP23S08-E-P-ND/735954

Cost: $1.10 (1/7/2017)

Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21919e.pdf

1.8V - 5.5V

Provides 8 parallel I/O ports with 2 addressing lines to select up to 4 devices (SPI version).

Need to test this device.