General Description

The MAX6391/MAX6392 microprocessor (µP) supervisory circuits provide sequenced logic reset outputs for multi component or dual-voltage systems. Each device can monitor two supply voltages and time-sequence two reset outputs to control the order in which system components are turned on and off. The MAX6391/MAX6392 increase system reliability and reduce circuit complexity and cost compared to separate ICs or discrete components.

Features

♦ Preset VCC Reset Threshold Voltages from 1.58V to 4.63V (master supply)

♦ Customer-Adjustable RESET IN2 to Monitor Voltages Down to 625mV (secondary supply)

♦ Fixed (140ms min) RESET1 Timeout

♦ Fixed (140ms min) or Customer-Adjustable RESET2 Timeout Period

♦ Guaranteed Reset Valid to VCC = 1V

♦ Active-Low Open-Drain Outputs or Push Pull/Open-Drain Combination

♦ Internal Open-Drain Pullup Resistors (for external VOH voltage connections)

♦ Manual Reset Input (MAX6392 only)

♦ Immune to Short Negative VCC Transients

♦ 15µA Typical Supply Current

♦ Few External Components

♦ Small 8-Pin SOT23 Package