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MAX6467 - Microprocessor Supervisory Reset Circuits

Description

The MAX6467/MAX6468 microprocessor (µP) supervisory circuits monitor single power-supply voltages from +1.8V to +5.0V and assert a reset if the supply voltage drops below its preset threshold.

Features

  • o Precision Factory-Set Reset Threshold Voltages for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies o Edge-Triggered Manual Reset Input with OneShot Pulsed Reset Output o Two Reset Timeout Period Options (150ms or 1200ms min) o Immune to Short Voltage Transients o Low Supply Current (3µA at VCC = +1.8V) o RESET Valid to VCC = +1V o Active-Low Open-Drain and Push-Pull RESET Output Options o -40°C to +125°C Operating Temperature Range o Small 4-Pin SC70 and SOT143 Packages o No External Components.

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Full PDF Text Transcription

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19-2523; Rev 0; 7/02 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset General Description The MAX6467/MAX6468 microprocessor (µP) supervisory circuits monitor single power-supply voltages from +1.8V to +5.0V and assert a reset if the supply voltage drops below its preset threshold. An edge-triggered, one-shot manual reset function ensures that the µP enters the reset mode for a fixed timeout period only, even in the event of a continuously asserted manual reset. The MAX6467/MAX6468 significantly improve system reliability compared to traditional manual reset supervisory circuits. A variety of factory-trimmed threshold options accommodate different supply voltages and tolerances, eliminating external components. The factory-set thresholds range from +1.
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