MAX691:Microprocessor Supervisory Circuits

Industry-Standard, Full-Function µP Supervisor

The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accu- racy compared to that obtainable with separate ICs or discrete components. The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions: A reset output during power-up, power-down, and brownout conditions. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic. A Reset pulse if the optional watchdog timer has not been toggled within a specified time. A 1.3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V. The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus: Write protection of CMOS RAM or EEPROM. Adjustable reset and watchdog timeout periods. Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low VCC.

Key Features
  • Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
    • Precision Voltage Monitor
      • 4.65V (MAX690, MAX691, MAX694, MAX695)
      • 4.40V (MAX692, MAX693)
    • Power OK/Reset Time Delay
      • 50ms, 200ms, or Adjustable
    • Watchdog Timer
      • 100ms, 1.6s, or Adjustable
    • Battery Backup Power Switching
    • Voltage Monitor for Power Fail or Low Battery Warning
    • Minimum External Component Count
  • Low Power Consumption in Battery Backup Mode Extends Battery Life
    • 1µA Standby Current
  • Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low VCC Events
MAX690, MAX691, MAX692, MAX693, MAX694, MAX695: Pin Configuration
MAX690, MAX691, MAX692, MAX693, MAX694, MAX695: Pin Configuration
Applications/Uses
  • Automotive Systems
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
DataSheet
titleDownload file
MAX690-MAX695 Data SheetMAX690-MAX695.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX6904.5 to 5.0Active Low
Push-Pull
5000-55 to +125
-40 to +85
0 to +70
CDIP(N)/8
LCC/20
PDIP(N)/8
$4.37 @1k
MAX6914.5 to 5.0Active High
Active Low
Push-Pull
CDIP(N)/16
LCC/20
PDIP(N)/16
SOIC(W)/16
$4.17 @1k
MAX6924.0 to 4.5Active Low
Push-Pull
CDIP(N)/8
LCC/20
PDIP(N)/8
$4.37 @1k
MAX6934.0 to 4.5Active High
Active Low
Push-Pull
CDIP(N)/16
LCC/20
PDIP(N)/16
SOIC(W)/16
$4.17 @1k
MAX6944.5 to 5.0Active Low
Push-Pull
CDIP(N)/8
LCC/20
PDIP(N)/8
$4.00 @1k
MAX6954.5 to 5.0Active High
Active Low
Push-Pull
CDIP(N)/16
PDIP(N)/16
SOIC(W)/16
$4.37 @1k
Quality and Environmental Data
Related Products
  • MAX802L:Microprocessor Supervisory Circuits
  • MAX802M:Microprocessor Supervisory Circuits
  • MAX805L:Microprocessor Supervisory Circuits
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX691C/DNo Longer AvailableDICE SALES,;NA pin;DICE;0°C to +70°CSee data sheet
MAX691CPENo Longer AvailableMAX691CPE+PDIP(N),;16 pin;158.4 mm²0°C to +70°CNo
MAX691CPE+ActivePDIP(N),;16 pin;158.4 mm²0°C to +70°CLead Free
MAX691CWENo Longer AvailableMAX691CWE+SOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
MAX691CWE+ActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
MAX691CWE+TActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
MAX691CWE-TNo Longer AvailableMAX691CWE+TSOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
MAX691EJEActiveCDIP(N),;16 pin;173.5 mm²-40°C to +85°CNo
MAX691EPENo Longer AvailableMAX691EPE+PDIP(N),;16 pin;158.4 mm²-40°C to +85°CNo
MAX691EPE+ActivePDIP(N),;16 pin;158.4 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX691EWENo Longer AvailableMAX691EWE+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
MAX691EWE+ActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
MAX691EWE+TActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
MAX691EWE-TNo Longer AvailableMAX691EWE+TSOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
MAX691MJEActiveCDIP(N),;16 pin;173.5 mm²-55°C to +125°CNo
MAX691MJE/883BActiveCDIP(N),;16 pin;173.5 mm²-55°C to +125°CNo
MAX691MLP/883BNo Longer AvailableLCC,;20 pin;82.6 mm²-55°C to +125°CNo
MAX690-MAX695.pdf MAX695
MAX691.pdf MAX691