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MAX704：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 Applications/Uses Computers Controllers Critical µP Power Monitoring Intelligent Instruments

DataSheet

Parametrics

Quality and Environmental Data

• MAX704.pdf

Ordering Information