General Description

The MAX6715A–MAX6729A/MAX6797A are ultra-low-voltage microprocessor (μP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.

Features

? VCC1 (Primary Supply) Reset Threshold Voltages from 1.58V to 4.63V

? VCC2 (Secondary Supply) Reset Threshold Voltages from 0.79V to 3.08V

? Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring

(0.62V Internal Reference)

? Watchdog Timer Option

? 35s (min) Long Startup Period

? 1.12s (min) Normal Timeout Period

? Manual-Reset Input Option

? Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)

? Guaranteed Reset Valid Down to VCC1 or VCC2 = 0.8V

? Reset Output Logic Options

? Immune to Short VCC Transients

? Low Supply Current 14μA (typ) at 3.6V

? Watchdog Disable Feature

? Small 5-, 6-, and 8-Pin SOT23 Packages

Applications

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery Operated Equipment

Industrial Equipment

Printers/Fax Machines

Set-Top Boxes