MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers General Description Features The MAX698/MAX699 monitor the +5V supply in micro- Precision Voltage Monitor processor (P) and digital systems. They supply a Power-OK/Reset Time Delay RESET pulse of at least 140ms duration on power-up, Watchdog Timer power-down, and during low-voltage brownout conditions. Minimum Component Count Circuit reliability is increased at reduced cost by eliminat- ing all external components and adjustments. Ordering Information The MAX699 includes all features of the MAX698, but * PART TEMP RANGE PIN-PACKAGE also provides a watchdog input to monitor microproces- MAX698CPA 0C to +70C 8 PDIP sor activity. The RESET output goes low if the watchdog MAX698CWE 0C to +70C 16 Wide SO input (WDI) is not toggled within 1 second. The watchdog MAX698EPA -40C to +85C 8 PDIP feature can be disabled by leaving WDI open. MAX698EWE -40C to +85C 16 Wide SO Both parts are supplied in 8-lead PDIP and 16-lead 0.3in MAX699CPA 0C to +70C 8 PDIP wide small outline (SO) packages and are specified from 0C to +70C for C grade devices and -40C to +85C MAX699CWE 0C to +70C 16 Wide SO for E devices. The SO versions, with more pins than the MAX699EPA -40C to +85C 8 PDIP 8-lead PDIP, have additional outputs not available in DIP MAX699EWE -40C to +85C 16 Wide SO packages. These are RESET (without inversion) and *Devices are available in both leaded and lead(Pb)-free pack- watchdog output (WDO). aging. Specify lead free by adding the + symbol at the end of the part number when ordering. Applications Pin Configuration Computers Controllers TOP VIEW + Intelligent Instruments V 1 8 GND CC Critical P Power Monitoring V 2 7 RESET CC MAX698 MAX699* 3 6 GND N.C. (WDI)* Typical Operating Circuit 4 5 N.C. GND +5V +5V DIP 1 16 RESET GND 1 8 V GND CC V 2 15 RESET CC V 3 14 N.C. (WDO)* CC MAX698 2 7 MAX699* V RESET CC GND 4 13 N.C. MAX698 TO P 5 12 N.C. N.C. RESET 3 6 INPUT GND N.C. 6 11 N.C. (WDI)* N.C. N.C. 7 10 N.C. 4 5 GND N.C. 8 9 GND N.C. SO * PIN LABELS IN ( ) ARE FOR MAX699 ONLY 19-2349 Rev 5 9/14MAX698/MAX699 Low-Cost, Power-On Reset and Watchdog Controllers Absolute Maximum Ratings V .......................................................................-0.3V to +6.0V Power Dissipation (T = +70C) CC A Input Voltage (with respect to GND) 8-Pin PDIP (derated 5mW/C above +70C)...............400mW WDI, WDO, RESET, RESET .................................. -0.3V to V 16-Pin SO (derated 7mW/C above +70C) ................600mW CC Operating Temperature Range Storage Temperature Range ........................... -65C to +150C C Suffix ...............................................................0C to +70C Lead Temperature (soldering, 10s) .................................+300C E Suffix ........................................................... -40C to +85C Rate of Rise, V ..........................................................100V/s CC 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 = +5V, T = +25C, unless otherwise noted.) CC A PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Voltage Range T = full 3.0 5.5 V A Supply Current 5 mA Power-Up Reset Deassertion T = full 4.50 4.65 4.75 V A Power-Up Reset Assertion T = full 4.4 V A Hysteresis 40 mV Reset Output Pulse Width 140 500 ms Output low I = 1.6mA, V = 4.4V 0.4 SINK CC V RESET OUTPUT (Open Drain) Output high I = 1A, V = 5V 3.5 SOURCE CC Output low I = 1.6mA, V = 5V 0.4 SINK CC RESET OUTPUT (SO Package V Only) Output high I = 1A, V = 4.4V 3.5 SOURCE CC Output low I = 1.6mA, V = 5V 0.4 SINK CC WDO Output (MAX699 SO V Package Only) Output high I = 1A, V = 4.4V 3.5 SOURCE CC MAX699 Watchdog Timeout s Period MAX699 Minimum WDI Input ns Pulse Width Logic-low 0.8 MAX699 WDI Input Threshold V = +5V V CC Logic-high 3.8 WDI = V 20 50 CC MAX699 WDI Input Current A WDI = 0V -50 -15 Maxim Integrated 2 www.maximintegrated.com