Maxim MAX690MJA/883B

Цепь резервного питания4.65V1

Overview

The MAX690MJA/883B 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 MAX690MJA/883B family significantly improves system reliability and accuracy compared to that obtainable with separate ICs or discrete components.

Benefts and ● 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

Features

Applications

• Power distribution systems of operating room
• Power distribution systems of infant care room
• Power distribution systems of ICU
• Power distribution systems of CCU
• emergency room
• Medical-specific isolation transformer
• Medical-specific insulation monitor
• Transformer load monitoring equipment
• External alarm
• Display equipment