MAX691ACWE

微处理器监控电路 Microprocessor Supervisory Circuits

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%.

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