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 chipenable 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%

 

 

Applications

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitorin

 

 

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  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

 

 

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