Parallel to Serial Converters and Load Switch Controllers 10-Pin uMAX

The MAX1663 serial-to-parallel/ parallel-to-serial converters are intended to control external power MOSFETs in power-plane switching applications. These small, low-cost devices can be used on a system motherboard to control point-of-load switching from a 2- wire SMBus serial interface. Each device has three high voltage open-drain outputs that double as TTL-level logic inputs, giving them bidirectional capabilities. The I/O pins can withstand +28V, so they can control battery voltage distribution switches in notebook computers. The MAX1663 are intended for P-channel MOSFETs, and their outputs are high-impedance upon power-up. This ensures that the MOSFETs are off at power-up, so the system can enforce power-plane sequencing. The SMBSUS\ control input selects control data between two separate data registers. This feature allows the system to select between two different power-plane configurations asynchronously, eliminating latencies introduced by the serial bus. Other features include thermal-overload and over current protection, ultra-low supply current, and both hardware and software interrupt capabilities. These devices are available in the space-saving 10-pin µMAX package.

• Performs Serial-to-Parallel and Parallel-to-Serial Conversions
• Three General-Purpose Digital Input/Output Pins(withstand +28V)
• SMBus 2-Wire Serial Interface
• Supports SMBSUS Asynchronous Suspend Mode
• 3µA Supply Current
• +2.7V to +5.5V Supply Range
• Space-Saving, Low-Cost 10-Pin µMAX Package