MAX699:Low-Cost, Power-On Reset and Watchdog Controllers

The MAX698/MAX699 monitor the +5V supply in microprocessor (µP) and digital systems. They supply a active-low 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 active-low 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 0°C to +70°C for C grade devices and -40°C to +85°C 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 (active-low WDO).

Key Features
  • Precision Voltage Monitor
  • Power-OK/Reset Time Delay
  • Watchdog Timer
  • Minimum Component Count
MAX698, MAX699: Typical Operating Circuit
MAX698, MAX699: Typical Operating Circuit
Applications/Uses
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
DataSheet
titleDownload file
MAX698-MAX699 Data SheetMAX698-MAX699.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6983.3 to 5.5Active High
Active Low
Open Drain
Push-Pull
85ms to 300msNo Watchdog-2.55000PDIP(N)/8
SOIC(W)/16
$2.33 @1k
MAX699Input (WDI)
Input/Output (WDI/WDO)
1s to 2sPDIP(N)/8
SOIC(W)/16
$2.23 @1k
Related Products
  • MAX6318:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6319:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6317:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6320:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6316:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6321:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6322:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX699CPANo Longer AvailableMAX699CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX699CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX699CWEActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
MAX699CWE+ActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
MAX699CWE+TActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
MAX699CWE-TNo Longer AvailableMAX699CWE+TW.SO;16 pin0°C to +70°CSee data sheet
MAX699EPANo Longer AvailableMAX699EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX699EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX699EPA-4ActiveMAX699EPAPDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX699EWENo Longer AvailableMAX699EWE+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX699EWE+ActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
MAX699EWE+TActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
MAX699EWE-TNo Longer AvailableMAX699EWE+TW.SO;16 pin-40°C to +85°CSee data sheet
MAX698-MAX699.pdf MAX699
MAX698-MAX699.pdf MAX699