General Description
The MAX1608/MAX1609 provide remote input/output (I/O) expansion through an SMBus™ 2-wire serial interface.
Each device has eight high-voltage open-drain outputs that double as TTL-level logic inputs, providing continuous bidirectional capabilities. The open-drain outputs tailor the MAX1608/MAX1609 for use in load-switching and other level-shifting applications as well as general-purpose I/O applications.

FEATUREs
♦Serial-to-Parallel or Parallel-to-Serial Conversions
♦8 General-Purpose Digital I/O Pins (withstand +28V)
♦SMBus 2-Wire Serial Interface
♦Supports SMBSUSAsynchronous Suspend
♦9 Pin-Selectable Slave Addresses
♦Outputs High Impedance on Power-Up (MAX1609)
♦Outputs Low on Power-Up (MAX1608)
♦2.5µA Supply Current
♦+2.7V to +5.5V Supply Range
♦16-Pin QSOP Package

APPLICATIONs
Parallel I/O Expansion
Power-Plane Switching
Notebook and Desktop Computers
Servers and Workstations
Notebook Docking Stations
Industrial Equipment