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:
1) An active-low reset during power-up, power-down, and
brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS μPs,
or other low-power logic circuitry.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power supply
other than +5V.
4) An active-low manual reset input.
The MAX703CSA+TG068 and MAX704 differ only in their supplyvolt age monitor levels. The MAX703CSA+TG068 generates a reset when the supply drops below 4.65V, while the MAX704 gener ates a reset below 4.40V.
Applications
● Computers
● Controllers
● Intelligent Instruments
● Critical μP Power Monitoring
Feature
● 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 Assertion to VCC = 1V
