MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers General Description The MAX698/MAX699 monitor the +5V supply in microprocessor (P) and digital systems. They supply a RESET pulse of at least 140ms duration on power-up, power-down, and during low-voltage brownout conditions. Circuit reliability is increased at reduced cost by eliminating all external components and adjustments. The MAX699 includes all features of the MAX698, but also provides a watchdog input to monitor microprocessor activity. The RESET output goes low if the watchdog input (WDI) is not toggled within 1 second. The watchdog feature can be disabled by leaving WDI open. Both parts are supplied in 8-lead PDIP and 16-lead 0.3in wide small outline (SO) packages and are specified from 0C to +70C for C grade devices and -40C to +85C for E devices. The SO versions, with more pins than the 8-lead PDIP, have additional outputs not available in DIP packages. These are RESET (without inversion) and watchdog output (WDO). Applications Features Precision Voltage Monitor Power-OK/Reset Time Delay Watchdog Timer Minimum Component Count Ordering Information PART* TEMP RANGE MAX698CPA 0C to +70C 8 PDIP MAX698CWE 0C to +70C 16 Wide SO MAX698EPA -40C to +85C 8 PDIP MAX698EWE -40C to +85C 16 Wide SO MAX699CPA 0C to +70C 8 PDIP MAX699CWE 0C to +70C 16 Wide SO MAX699EPA -40C to +85C 8 PDIP MAX699EWE -40C to +85C 16 Wide SO *Devices are available in both leaded and lead(Pb)-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. Pin Configuration Computers Controllers Intelligent Instruments Critical P Power Monitoring TOP VIEW Typical Operating Circuit +5V + VCC 1 VCC 2 GND 3 GND 4 +5V 1 2 3 4 VCC GND VCC RESET GND GND N.C. 7 N.C. 6 5 8 GND 7 RESET 6 N.C. (WDI)* 5 N.C. DIP 8 MAX698 MAX698 MAX699* TO P RESET INPUT GND 1 16 RESET VCC 2 15 RESET VCC 3 14 N.C. (WDO)* GND 4 13 N.C. N.C. 5 12 N.C. N.C. 6 11 N.C. (WDI)* N.C. 7 10 N.C. N.C. 8 9 GND MAX698 MAX699* SO * PIN LABELS IN ( ) ARE FOR MAX699 ONLY 19-2349; Rev 5; 9/14 PIN-PACKAGE MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers Absolute Maximum Ratings VCC.......................................................................-0.3V to +6.0V Input Voltage (with respect to GND) WDI, WDO, RESET, RESET................................... -0.3V to VCC Operating Temperature Range C Suffix................................................................0C to +70C E Suffix............................................................ -40C to +85C Rate of Rise, VCC...........................................................100V/s Power Dissipation (TA = +70C) 8-Pin PDIP (derated 5mW/C above +70C)...............400mW 16-Pin SO (derated 7mW/C above +70C).................600mW Storage Temperature Range . .......................... -65C to +150C 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 (VCC = +5V, TA = +25C, unless otherwise noted.) PARAMETER Operating Voltage Range CONDITIONS TA = full MIN TYP 3.0 Supply Current Power-Up Reset Deassertion TA = full 4.50 Power-Up Reset Assertion TA = full 4.4 Hysteresis UNITS 5.5 V 5 mA 4.75 V V 40 Reset Output Pulse Width 140 Output low ISINK = 1.6mA, VCC = 4.4V Output high ISOURCE = 1A, VCC = 5V RESET OUTPUT (SO Package Only) Output low ISINK = 1.6mA, VCC = 5V Output high ISOURCE = 1A, VCC = 4.4V WDO Output (MAX699 SO Package Only) Output low ISINK = 1.6mA, VCC = 5V Output high ISOURCE = 1A, VCC = 4.4V RESET OUTPUT (Open Drain) 4.65 MAX mV 500 0.4 3.5 0.4 3.5 0.4 3.5 ms V V V MAX699 Watchdog Timeout Period s MAX699 Minimum WDI Input Pulse Width ns MAX699 WDI Input Threshold MAX699 WDI Input Current www.maximintegrated.com VCC = +5V Logic-low Logic-high 0.8 3.8 WDI = VCC WDI = 0V 20 -50 -15 50 V A Maxim Integrated 2 MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers Pin Configuration PIN NAME FUNCTION SO PDIP 1, 4, 9 3, 4, 8 GND Chip Power Ground 2, 3 1, 2 VCC +5V Sense Input and MAX698/MAX699 Chip Power 5-8, 10-14 5, 6 N.C. No Connection 11 6 WDI (MAX699 Only) (MAX699 Only.) A three-level input. If WDI remains high or low for more than the watchdog timeout period, RESET pulses low (WDO also goes low on the MAX699 SO package). If WDI is unconnected, the watchdog circuit is disabled. (MAX699 Only.) Goes low when WDI remains high or low for more than the watchdog timeout period. WDO is set high at the next WDI transition. If WDI is unconnected or at midsupply, WDO remains high. WDO also remains high when VCC falls below 4.4V. 14 -- WDO (MAX699 Only) 15 7 RESET Goes low when VCC falls below internally set threshold (see the Electrical Characteristics table). 16 -- RESET Goes high when VCC falls below internally set threshold. Pin Description WDI* WATCHDOG TIMER WDO* RESET TIMER RESET VCC RESET* VCC POWER-ON RESET MAX698 MAX699 4.65V GND www.maximintegrated.com *WDI ON MAX699 ONLY RESET ON SO PACKAGE ONLY WDO ON SO MAX699 ONLY Maxim Integrated 3 MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 PDIP P8-2 21-0043 -- 16 Wide SO W16-1 21-0042 90-0107 www.maximintegrated.com Chip Topography Maxim Integrated 4 MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 4 5/13 Corrected WDI SO pin number in Pin Description 3 5 9/14 No /V OPNs; removed automotive reference from Applications 1 DESCRIPTION For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2014 Maxim Integrated Products, Inc. 5 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX698CPA+ MAX698CWE+ MAX698EPA+ MAX699CPA+ MAX698CWE+T MAX698EWE+ MAX698EWE+T MAX699CWE+ MAX699CWE+T MAX699EPA+ MAX699EWE+ MAX699EWE+T