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General Description

The MAX6340/MAX6421–MAX6426 low-power micro processor supervisor circuits monitor system voltages from 1.6V to 5V. These devices perform a single function: they assert a reset signal whenever the VCC supply volt age falls below its reset threshold. The reset output remains asserted for the reset timeout period after VCC rises above the reset threshold. The reset timeout is exter nally set by a capacitor to provide more flexibility.

Features

? Monitor System Voltages from 1.6V to 5V

? Capacitor-Adjustable Reset Timeout Period

? Low Quiescent Current (1.6μA typ)

? Three RESET Output Options

?? Push-Pull RESET

?? Push-Pull RESET

?? Open-Drain RESET

? Guaranteed Reset Valid to VCC = 1V

? Immune to Short VCC Transients

? Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23 Packages

? MAX6340 Pin Compatible with LP3470

? MAX6424/MAX6425 Pin Compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD

? MAX6426 Pin Compatible with PST92XX

Applications

? Portable Equipment

? Battery-Powered Computers/Controllers

? Automotive

? Medical Equipment

? Intelligent Instruments

? Embedded Controllers

? Critical μP Monitoring

? Set-Top Boxes

? Computers

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