MAX703:Low-Cost Microprocessor Supervisory Circuits with Battery Backup

Battery-Backup with Manual Reset and Power-Fail Comparator

The MAX703/MAX704 microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in µP systems. These devices significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components. The MAX703/MAX704 are available in 8-pin DIP and SO packages and provide four functions: An active-low reset during power-up, power-down, and brownout conditions. Battery-backup switching for CMOS RAM, CMOS µPs, or other low-power logic circuitry. A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V. An active-low manual reset input. The MAX703 and MAX704 differ only in their supply-voltage monitor levels. The MAX703 generates a reset when the supply drops below 4.65V, while the MAX704 generates a reset below 4.40V.

Key Features
  • Battery-Backup Power Switching
  • Precision Supply-Voltage Monitor
    • 4.65V (MAX703)
    • 4.40V (MAX704)
  • 200ms Reset Pulse Width
  • Debounced TTL/CMOS-Compatible Manual Reset Input
  • 200µA Quiescent Current
  • 50nA Quiescent Current in Battery-Backup Mode
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • 8-Pin DIP and SO Packages
  • Guaranteed RESET-bar Assertion to VCC = 1V
MAX703, MAX704: Typical Operating Circuit
MAX703, MAX704: Typical Operating Circuit
Applications/Uses
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
DataSheet
titleDownload file
MAX703-MAX704 Data SheetMAX703-MAX704.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX7033.3 to 5.5Active Low
Push-Pull
350-55 to +125
-40 to +85
0 to +70
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$3.24 @1k
MAX7042.5 to 3.3
3.3 to 5.5
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$4.00 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX703C/DNo Longer AvailableSee data sheet
MAX703CPANo Longer AvailableMAX703CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX703CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX703CSANo Longer AvailableMAX703CSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX703CSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX703CSA+G068ActiveMAX703CSA+N.SO;0°C to +70°CSee data sheet
MAX703CSA+TActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX703CSA-TNo Longer AvailableMAX703CSA+TSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX703EPANo Longer AvailableMAX703EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX703EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX703ESANo Longer AvailableMAX703ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX703ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX703ESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX703ESA-TNo Longer AvailableMAX703ESA+TSOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX703MJAActiveCDIP(N),;8 pin;82.6 mm²-55°C to +125°CNo
MAX703-MAX704.pdf MAX704
MAX703.pdf MAX703
MAX703-MAX704.pdf MAX704