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