General Description

The MAX691A/MAX693A/MAX800L/MAX800M microprocessor (μP) supervisory circuits are pin-compatible upgrades to the MAX691, MAX693, and MAX695. They improve performance with 30μA supply current, 200ms typ reset active delay on power-up, and 6ns chip enable propagation delay. Features include write protection of CMOS RAM or EEPROM, separate watchdog outputs, backup-battery switchover, and a RESET output that is valid with VCC down to 1V. The MAX691A/MAX800L have a 4.65V typical reset-threshold voltage, and the MAX693A/MAX800M’s reset threshold is 4.4V typical. The MAX800L/MAX800M guarantee power-fail accuracies to ±2.

特性 Features

? 200ms Power-OK/Reset Timeout Period

? 1μA Standby Current, 30μA Operating Current

? On-Board Gating of Chip-Enable Signals, 10ns Max Delay

? MaxCap? or SuperCap? Compatible

? Guaranteed RESET Assertion to VCC = +1V

? Voltage Monitor for Power-Fail or Low-Battery Warning

? Power-Fail Accuracy Guaranteed to ±2 (MAX800L/M)

? Available in 16-Pin Narrow SO and Plastic DIP Packages

Applications

? Computers

? Controllers

? Intelligent Instruments

? Automotive Systems

? Critical μP Power Monitoring