ADM697ARZ

The ADM696/ADM697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include μP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The ADM696/ADM697 are available in 16-pin DIP and small outline packages and provide the following functions: Power-On Reset output during power-up, power-down and brownout conditions. The RESET voltage threshold is adjustable using an external voltage divider. The RESET output remains operational with VCC as low as 1 V. A Reset pulse if the optional watchdog timer has not been toggled within specified time. Separate watchdog time-out and low line status outputs. Adjustable reset and watchdog timeout periods. A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than VCC. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic (ADM696). Write protection of CMOS RAM or EEPROM (ADM697).

Applications

• Microprocessor Systems
• Computers
• Controllers
• Intelligent Instruments
• Automotive Systems
• Critical μP Power Monitoring

Key features

• Superior Upgrade for MAX696/MAX697
• Specified Over Temperature
• Adjustable Low Line Voltage Monitor
• Power OK/Reset Time Delay
• Reset Assertion Down to 1 V Vcc
• Watchdog Timer — 100 ms, 1.6 s, or Adjustable
• Low Switch On Resistance
• 1.5 Ω Normal, 20 Ω in Backup
• 600 nA Standby Current
• Automatic Battery Backup Switching (ADM696)
• Fast On-Board Gating of Chip Enable Signals (ADM697)
• Voltage Monitor for Power Fail or Low Battery Warning