MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits ________________________________________________________________Maxim Integrated Products1 TOP VIEW 1 2 3 4 8 7 6 5 WDO RESET (RESET) WDI PFO PFI GND VCC MR DIP/SO MAX705? MAX706? MAX813L 1 2 3 4 8 7 6 5 RESET RESET N.C. PFO PFI GND VCC MR DIP/SO MAX707? MAX708 ( ) ARE FOR MAX813L ONLY.? Pin Configurations continued at end of data sheet. _________________Pin Configurations VCC PFI MRPFO WDO ? RESET UNREGULATED DC PUSHBUTTON? SWITCH PFII/O LINE INTERRUPT µP MAX705? MAX706? MAX813L MAX667 +5V DC LINEAR? REGULATOR VCC RESET NMI __________Typical Operating Circuit Call toll free 1-800-998-8800 for free samples or literature. 19-4334; Rev. 5; 9/95 _______________General Description The MAX705-MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices signifi- cantly improve system reliability and accuracy com- pared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. 3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power sup- ply other than +5V. 4) An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of RESET. Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX packages. _______________________Applications Computers Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring ___________________________Features o µMAX Package: Smallest 8-Pin SO o Guaranteed RESET Valid at VCC= 1V o Precision Supply-Voltage Monitor 4.65V in MAX705/MAX707/MAX813L 4.40V in MAX706/MAX708 o 200ms Reset Pulse Width o Debounced TTL/CMOS-Compatible Manual-Reset Input o Independent Watchdog Timer—1.6sec Timeout (MAX705/MAX706) o Active-High Reset Output (MAX707/MAX708/MAX813L) o Voltage Monitor for Power-Fail or Low-Battery Warning ______________Ordering Information PARTTEMP. RANGEPIN-PACKAGE MAX705CPA8 Plastic DIP MAX705CSA0°C to +70°C8 SO MAX705C/D0°C to +70°CDice* Ordering Information continued at end of data sheet. * Dice are specified at TA= +25°C. **Contact factory for availability and processing to MIL-STD-883. 0°C to +70°C MAX705CUA0°C to +70°C8 µMAX MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits 2_______________________________________________________________________________________ Terminal Voltage (with respect to GND) VCC-0.3V to 6.0V All Other Inputs (Note 1) .-0.3V to (VCC+ 0.3V) Input Current VCC20mA GND20mA Output Current (all outputs).20mA Continuous Power Dissipation Plastic DIP (derate 9.09mW/°C above +70°C) .727mW SO (derate 5.88mW/°C above +70°C) .471mW µMAX (derate 4.10mW/°C above +70°C) 330mW CERDIP (derate 8.00mW/°C above +70°C) 640mW Operating Temperature Ranges MAX70_C__, MAX813LC__0°C to +70°C MAX70_E__, MAX813LE__ .-40°C to +85°C MAX70_MJA -55°C to +125°C Storage Temperature Range-65°C to +160°C Lead Temperature (soldering, 10sec)+300°C ELECTRICAL CHARACTERISTICS (VCC= 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC= 4.5V to 5.5V for MAX706/MAX708, TA= TMINto TMAX, unless otherwise noted.) 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. PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS Operating Voltage RangeVCC MAX70_C1.05.5 VMAX813LC1.15.5 MAX70_E/M, MAX813LE/M1.25.5 Reset Threshold (Note 2)VRT MAX705, MAX707, MAX813L4.504.654.75 MAX706, MAX7084.254.404.50 40mV Reset Pulse Width (Note 2)tRS140200280ms RESET Output Voltage ISOURCE= 800µAVCC- 1.5 V ABSOLUTE MAXIMUM RATINGS Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA. Reset Threshold Hysteresis (Note 2) ISINK= 3.2mA0.4 0.3 0.3 RESET Output Voltage MAX707, MAX708, ISOURCE= 800µA V MAX707, MAX708, ISINK= 1.2mA0.4 0.8 0.9 MAX813L VCC- 1.5 0.4 Watchdog Timeout PeriodtWDMAX705, MAX706, MAX813L1.001.602.25sec WDI Pulse WidthtWPVIL= 0.4V, VIH= (VCC) (0.8)50ns WDI Input Threshold 0.8 V 3.5 MAX70_C, VCC= 1V, ISINK= 50µA MAX70_E/M, VCC= 1.2V, ISINK= 100µA MAX813LC, ISOURCE= 4µA, VCC= 1.1V MAX813LE/M, ISOURCE= 4µA, VCC= 1.2V ISOURCE= 800µA I。