MAX1661/MAX1662/MAX1663 19-1306 Rev 0 10/97 EVALUATION KIT AVAILABLE Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface 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 3A Supply Current can withstand +28V, so they can control battery voltage- 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 MAX 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 PART TEMP. RANGE PIN-PACKAGE enforce power-plane sequencing. MAX1661EUB -40C to +85C 10 MAX The SMBSUS control input selects control data between MAX1662EUB -40C to +85C 10 MAX two separate data registers. This feature allows the system MAX1663EUB -40C to +85C 10 MAX 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 MAX package. V 1 10 ALERT CC I/O1 2 9 SMBCLK MAX1661 Applications I/O2 3 8 SMBDATA MAX1662 Power-Plane Switching MAX1663 I/O3 4 7 SMBSUS Point-of-Load Power-Bus Switching GND 5 6 ADD Notebook and Subnotebook Computers MAX Desktop Computers Smart Batteries Typical Operating Circuits appear at end of data sheet. Selector Guide SMBus ADDRESS POWER-ON- INTENDED PART RESET STATE APPLICATION x ADDRESS PIN ADDRESS GND 0100000 MAX1661 Outputs Low N-Channel MOSFETs High-Z 0111100 V 1001000 CC GND 0100001 Outputs High MAX1662 P-Channel MOSFETs High-Z 0111101 (high-Z state) V 1001001 CC GND 0100010 Outputs High MAX1663 P-Channel MOSFETs High-Z 0111110 (high-Z state) V 1001010 CC SMBus is a trademark of Intel Corp. Maxim Integrated Products 1 For free samples & the latest literature: Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC A I/O to GND (I/O1, I/O2, I/O3)..................................-0.3V to +30V 10-pin MAX (derate 5.6mW/C above +70C) ...........444mW I/O Sink Current (I/O1, I/O2, I/O3), Operating Temperature Range Internally Limited.............................................-1mA to +50mA MAX166 EUB ..................................................-40C to +85C Digital Inputs to GND (SMBCLK, SMBDATA, Storage Temperature Range .............................-65C to +160C SMBSUS, ALERT).................................................-0.3V to +6V Lead Temperature (soldering, 10sec) .............................+300C ADD to GND...............................................-0.3V to (V + 0.3V) CC SMBDATA Current, ALERT Current ....................-1mA to +50mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +2.7V to +5.5V, T = T to T , unless otherwise noted. Typical values are for T = +25C.) (Note 1) CC A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range 2.7 5.5 V Static condition SMBDATA, SMBCLK, ADD, Supply Current 3 10 A ALERT = V or GND (Note 2) CC Undervoltage Lockout/ V falling 1.2 1.6 2.5 V CC Power-On Reset Threshold V = 0.4V, V = 2.7V or 5.5V 2 I/O CC I/O Sink Current mA V = 1.0V, V = 4.5V 8 13 I/O CC I/O Current Limit I/O1, I/O2, or I/O3 V = 4.5V 15 20 50 mA CC Thermal Shutdown Typical hysteresis of 10C 140 C V = 28V, high-impedance state 0.5 5 I/O I/O Leakage Current A V = 0V, V high-impedance state -1 0.5 1 I/O CC V , V , V , SMBDATA SMBCLK SMBSUS Digital Input Current -1 1 A V = 0V, V ADD CC V = 2.7V to 5.5V SMBus Logic Input CC 0 5.5 V Voltage Range SMBDATA, SMBCLK, SMBSUS Logic Input High Voltage I/O , SMBSUS, SMBCLK, SMBDATA 2.4 V Logic Input Low Voltage I/O , SMBSUS, SMBCLK, SMBDATA 0.8 V SMBDATA Output Low Sink V = 0.6V 6 mA SMBDATA Current V = 0.4V 1 mA ALERT Output Low Sink Current ALERT ALERT Output Leakage Current V = 5.5V, high-Z state 1 A ALERT SMBus Input Capacitance SMBCLK, SMBDATA 5 pF SMBus Clock Frequency (Notes 3, 4) 100 kHz Measured between the 90% level of the rising SMBCLK High Time t 4 s HIGH edge and the 90% level of the falling edge Measured between the 10% level of the falling SMBCLK Low Time t 4.7 s LOW edge and the 10% level of the rising edge 2 MAX1661/MAX1662/MAX1663