MAX703 Datasheet | Maxim Integrated

MAX703/MAX704 Low-Cost Microprocessor Supervisory Circuits with Battery Backup General Description The MAX703/MAX704 microprocessor (μP) supervisory circuits reduce the plexity and number of ponents required for power-supply monitoring and battery control functions in μP systems. These devices significantly improve system reliability and accuracy pared to that obtained with separate ICs or discrete ponents. 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 MAX703 and MAX704 differ only in their supplyvoltage monitor levels. The MAX703 generates a reset when the supply drops below 4.65V, while the MAX704 generates a reset below 4.40V. Applications - - puters - - Controllers - - Intelligent Instruments - - Critical μP Power Monitoring Typical Operating Circuit UNREGULATED DC REGULATED +5V R1 0.1µF VCC RESET 3.6V LITHIUM R2 BATTERY MAX704 VBATT MR GND VOUT PUSHBUTTON SWITCH MICROPROCESSOR VCC RESET NMI VCC CMOS RAM...