19-1306; Rev 0; 10/97 EVALUATION KITAVAILABLESerial-to-Parallel/Parallel-to-Serial Converters andLoad-Switch Controllers with SMBus InterfaceMAX1661/MAX1662/MAX1663________________General Description____________________________Features The MAX1661/MAX1662/MAX1663 serial-to-parallel/ ♦ Performs Serial-to-Parallel and Parallel-to-Serial parallel-to-serial converters are intended to control external Conversions power MOSFETs in power-plane switching applications. ♦ Three General-Purpose Digital Input/Output Pins These small, low-cost devices can be used on a system (withstand +28V) motherboard to control point-of-load switching from a 2- wire SMBus™ serial interface. Each device has three high- ♦ SMBus 2-Wire Serial Interface voltage open-drain outputs that double as TTL-level logic ♦ Supports SMBSUS Asynchronous Suspend Mode inputs, giving them bidirectional capabilities. The I/O pins can withstand +28V, so they can control battery voltage- ♦ 3µA Supply Current distribution switches in notebook computers. ♦ +2.7V to +5.5V Supply Range The MAX1661 is intended for driving N-channel MOSFETs ♦ Space-Saving, Low-Cost 10-Pin µMAX Package and its outputs are low upon power-up. The MAX1662/ MAX1663 are intended for P-channel MOSFETs, and their ______________Ordering Information outputs are high-impedance upon power-up. This ensures that the MOSFETs are off at power-up, so the system can PARTTEMP. RANGEPIN-PACKAGE enforce power-plane sequencing. MAX1661 EUB -40°C to +85°C 10 µMAX The SMBSUS control input selects control data between MAX1662 EUB -40°C to +85°C 10 µMAX two separate data registers. This feature allows the system MAX1663 EUB -40°C to +85°C 10 µMAX to select between two different power-plane configurations asynchronously, eliminating latencies introduced by the serial bus. Other features include thermal-overload and __________________Pin Configuration overcurrent protection, ultra-low supply current, and both hardware and software interrupt capabilities. These TOP VIEW devices are available in the space-saving 10-pin µMAX package. VCC 1 10 ALERT I/O1 2 9 SMBCLK ________________________Applications MAX1661 I/O2 3 8 SMBDATA MAX1662 Power-Plane Switching I/O3 4 MAX1663 7 SMBSUS Point-of-Load Power-Bus Switching GND 5 6 ADD Notebook and Subnotebook Computers µ MAX Desktop Computers Smart Batteries Typical Operating Circuits appear at end of data sheet.______________________________________________________________Selector GuidePOWER-ON-INTENDEDSMBus ADDRESSPART x RESET STATEAPPLICATIONADDRESS PINADDRESS GND 0100000 MAX1661 Outputs Low N-Channel MOSFETs High-Z 0111100 VCC 1001000 GND 0100001 Outputs High MAX1662 P-Channel MOSFETs High-Z 0111101 (high-Z state) VCC 1001001 GND 0100010 Outputs High MAX1663 P-Channel MOSFETs High-Z 0111110 (high-Z state) VCC 1001010 SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products1For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.