MAX1608/MAX1609 19-1639 Rev 1 10/06 Octal SMBus-to-Parallel I/O Expanders General Description Features The MAX1608/MAX1609 provide remote input/output (I/O) Serial-to-Parallel or Parallel-to-Serial Conversions expansion through an SMBus 2-wire serial interface. 8 General-Purpose Digital I/O Pins Each device has eight high-voltage open-drain outputs (Withstand +28V) that double as TTL-level logic inputs, providing continuous bidirectional capabilities. The open-drain outputs tailor the SMBus 2-Wire Serial Interface MAX1608/MAX1609 for use in load-switching and other Supports SMBSUS Asynchronous Suspend level-shifting applications as well as general-purpose I/O applications. 9 Pin-Selectable Slave Addresses Two complete sets of registers allow the device and its Outputs High Impedance on Power-Up (MAX1609) outputs to be toggled between two states using the SMBSUS input, without the inherent latency of reprogram- Outputs Low on Power-Up (MAX1608) ming outputs over the serial bus. The eight I/O lines are 2.5A Supply Current continuously monitored and can be used as inputs. Each line can generate asynchronous maskable interrupts on +2.7V to +5.5V Supply Range the falling edge, the rising edge, or both edges. 16-Pin QSOP Package For load-switching applications, the MAX1608 is designed to drive n-channel MOSFETs, and its outputs are low upon power-up the MAX1609 is designed to drive p-channel MOSFETs, and its I/Os are high impedance upon power- up. Other features of both devices include thermal-over- Ordering Information load and output-overcurrent protection, ultra-low supply PART TEMP RANGE PIN-PACKAGE current, and a wide +2.7V to +5.5V supply range. The MAX1608EEE -40C to +85C 16 QSOP MAX1608/MAX1609 are available in space-saving 16-pin QSOP packages. MAX1609EEE -40C to +85C 16 QSOP Applications Parallel I/O Expansion Power-Plane Switching Notebook and Desktop Computers Typical Operating Circuits Servers and Workstations Notebook Docking Stations Industrial Equipment +2.7V TO +5.5V 100k 100k 100k V+ Pin Configuration 0.1F MAX1609 TOP VIEW p-CH IO0 1 16 V+ ALERT IO1 SMBUS SMBDATA IO2 IO1 2 15 SMBSUS TO/ FROM SMBCLK IO3 IO2 3 14 SMBCLK HOST SMBSUS IO3 4 MAX1608 13 ALERT MAX1609 ADD1 LOAD1 LOAD2 LOAD3 IO4 5 12 SMBDATA ADD IO7 GND IO5 6 11 ADD1 IO6 7 10 ADD0 IO7 8 9 GND QSOP Typical Operating Circuits continued at end of data sheet. SMBus is a trademark of Intel Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Octal SMBus-to-Parallel I/O Expanders ABSOLUTE MAXIMUM RATINGS V+ to GND................................................................-0.3V to +6V SMBDATA and ALERT Sink Current ...................-1mA to +50mA IO to GND.............................................................-0.3V to +30V Continuous Power Dissipation (T = +70C) A IO Sink Current..................................................-1mA to +50mA 16-Pin QSOP (derate 8.3mW/C above +70C)...........667mW SMBCLK, SMBDATA, SMBSUS Operating Temperature Range ...........................-40C to +85C and ALERT to GND .............................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C ADD to GND ...............................................-0.3V to (V+ + 0.3V) Lead Temperature (soldering, 10s) .................................+300C 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 = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A A PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage Range 2.7 5.5 V Static, outputs in any combination of on or off 718 states up to 28V Supply Current (Note 2) Static, all IOs low or pulled to 0 3.5 9 A SMBus interface operating, 7 clock frequency = 100kHz POR Threshold Voltage Falling edge of V+ 1.2 1.8 2.5 V IO forced to 0.4V 2 I/O Sink Current mA IO forced to 1.0V, V+ = 4.5V 813 I/O Current Limit IO , V+ = 4.5V 15 25 50 mA I/O Leakage Current IO forced to 28V 0.5 2 A SMBCLK to IO 2.5 Propagation Delay 1 s SMBSUS to IO IO to ALERT 10 IO Data Set-Up Time 10% or 90% of I/O to 10% of SMBCLK (Note 3) 10 s IO Data Hold Time (Note 3) 3 s SMBus Logic Input Voltage Range 0 5.5 V SMBSUS, SMBCLK, SMBDATA (Note 2) Logic Input High Voltage IO , SMBSUS, SMBCLK, SMBDATA 2.1 V Logic Input Low Voltage IO , SMBSUS, SMBCLK, SMBDATA 0.8 V SMBus Output Low Sink Current SMBDATA forced to 0.6V 6 mA ALERT Output Low Sink Current ALERT forced to 0.4V 1 mA 1 A ALERT Output High Leakage Current ALERT forced to 5.5V Thermal Shutdown 10C typical hysteresis 140 C ADD during address sampling (POR, SPOR, Sample Address Input Impedance 20 k and RAP) to V+ and GND (Note 4) Logic Input Current SMBDATA, SMBCLK, SMBUS, ADD -1 1 A SMBus Input Capacitance SMBCLK, SMBDATA 5 pF 2 MAX1608/MAX1609