MCP23018 is a 16-bit I/O expander for high speed I2C™Compatible interface. MCP23018 is available in the following packages: 28-pin PDIP (300 mil,)28-pin SOIC (300 mil), 24-pin SSOP, 24-pin QFN (4x4)

   16-bit remote bidirectional I/O port

   Open-drain outputs:

   5.5V tolerant

   25 mA sink

   400 mA total current out

   Low standby current as low as 1 µA

   High-speed I2C™ interface upto 3.4MHz

   Single hardware address pin: Voltage input to allow up to eight devices on the bus

   Configurable interrupt output pins: Configurable as active-high, active-low or open-drain

   Low standby current:1 µA (typ.)