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General Description

The MAX696/MAX697 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (μP) systems. These include μP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX696/MAX697 significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components.

Features

● Adjustable Low-Line Monitor and Power-Down Reset

● Power-OK/Reset Time Delay

● Watchdog Timer—100ms, 1.6s, or Adjustable

● Minimum Component Count

● 1μA Standby Current

● Battery-Backup Power Switching (MAX696)

● On-Board Gating of Chip-Enable Signals (MAX697)

● Separate Monitor for Power-Fail or Low-Battery Warning

Applications

● Computers

● Controllers

● Intelligent Instruments

● Critical μP Power Monitoring