MAX6837FXSD0中文资料

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19-2242; Rev 1; 1/02

Ultra-Low-Voltage SC70 Voltage Detectors

and µP Reset Circuits

General Description

The MAX6832–MAX6840 are microprocessor (µP)supervisory circuits used to monitor low-voltage poweroFactory-Set Reset Threshold Voltages forsupplies in µP and digital systems. They provide excel-Nominal Supplies from 1.2V to 1.8Vlent circuit reliability and low cost by eliminating exter-oLow Power Consumption: 7.5µA (typ) nal components and adjustments when used with+1.2V to +1.8V powered circuits.

oSpace-Saving 3- and 4-Pin SC70 PackagesThese devices assert a reset signal whenever the Vo±2.5% Reset Threshold Accuracy Oversupply voltage declines below a preset threshold orCCTemperature

whenever manual reset (MR) is asserted. Reset remainsoFive Different Timeout Periods Available: 70µsasserted for a fixed timeout delay after V(voltage detector), 1.5ms, 30ms, 210ms, and 1.68sabove the reset threshold or when manual reset isCChas risendeasserted. Five different timeout periods are available:oThree Reset Output Configurations

70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.Push-Pull RESETReset thresholds suitable for operation with a variety ofPush-Pull RESETsupply voltages are available.

Open-Drain RESETThe MAX6832/MAX6835/MAX6838 have a push-pulloGuaranteed Reset Valid to VCC=

active-low reset output (RESET). The MAX6833/0.55V—Active-Low MAX6836/MAX6839 have a push-pull active-high reset0.75V—Active-Highoutput (RESET) and the MAX6834/MAX6837/MAX6840have an open-drain active-low reset output (RESET). TheoAdjustable Threshold Reset-In Option open-drain active-low reset output requires a pullup resis-oManual Reset Input Option

tor that can be connected to a voltage higher than VCC. The MAX6835/MAX6836/MAX6837 feature a debouncedoImmune to Short Negative VCCTransientsmanual reset input (MR), while the MAX6838/MAX6839/oPin Compatible with MAX803/MAX809/MAX810,MAX6840 provide a RESET-IN input allowing the user toMAX6711/MAX6712/MAX6713, andexternally adjust the reset threshold. The reset compara-MAX6381–MAX6390 Series

tor is designed to ignore fast transients on VCC.

Low supply current of 7.5µA makes the MAX6832–MAX6840 ideal for use in portable equipment. Thesedevices are available in 3- and 4-pin SC70 packages.

ComputersControllers

Intelligent Instruments

Critical µP and µC Power MonitoringPortable/Battery-Powered Equipment

Insert the desired suffix letter from the Threshold Suffix Guide(MAX6832–MAX6837) and the Active Timeout Period Guidetables into the blanks to complete the part number. Samplestock is generally available on standard versions only (see

Pin Configurations appear at end of data sheet.Standard Versions table). Standard versions require a minimumorder increment of 2.5k units. Nonstandard versions must beTypical Operating Circuit apears at end of data sheet.ordered in 10k unit increments. Contact factory for availability.Selector Guide appears at end of data sheet.

All parts are offered in tape-and-reel only.

________________________________________________________________Maxim Integrated Products1

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at doc.xuehai.net.

MAX6832–MAX6840

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