Maxim Integrated 8-Channel I/O Expander Serial-2 Wire 16-Pin TQFN-EP, MAX7321ATE+

The Maxim MAX7321 2 wire serial interfaced peripheral features eight open-drain I/O ports with selectable internal pull-ups and transition detection. Any port may be used as a logic input or an open-drain output. Ports are overvoltage protected to +6V independent of supply voltage.

400kHz I2C serial interface
+1.71V to +5.5V operating voltage
8 open drain I/O ports rated to 20mA sink current