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19-1839; Rev 1; 04/01
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
General Description
Features
The MAX6381–MAX6390 microprocessor (µP) supervisorycircuits monitor power supply voltages from +1.8V tooFactory-Set Reset Threshold Voltages Ranging+5.0V while consuming only 3µA of supply current atfrom +1.58V to +4.63V in Approximately 100mV+1.8V. Whenever VCCfalls below the factory-set resetIncrementsthresholds, the reset output asserts and remains assert-o±2.5% Reset Threshold Accuracy Overed for a minimum reset timeout period after VCCrisesTemperature (-40°C to +125°C)above the reset threshold. Reset thresholds are availablefrom +1.58V to +4.63V, in approximately 100mV incre-oSeven Reset Timeout Periods Available: 1ms,ments. Seven minimum reset timeout delays ranging20ms, 140ms, 280ms, 560ms, 1120ms, from 1ms to 1200ms are available.
1200ms (min)The MAX6381/MAX6384/MAX6387 have a push-pullo3 Reset Output Options
active-low reset output. The MAX6382/MAX6385/Active-Low Push-PullMAX6388 have a push-pull active-high reset output,Active-High Push-Pulland the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. TheActive-Low Open-Drain
MAX6384/MAX6385/MAX6386 also feature aoReset Output State Guaranteed Valid debounced manual reset input (with internal pullupDown to VCC= 1V
resistor). The MAX6387/MAX6388/MAX6389 have anauxiliary input for monitoring a second voltage. TheoManual Reset Input (MAX6384/MAX6385/MAX6386)MAX6390 offers a manual reset input with a longer VoAuxiliary RESETIN
reset timeout period (1120ms or 1200ms) and a shorterCC(MAX6387/MAX6388/MAX6389)
manual reset timeout (140ms or 150ms).
oVCCReset Timeout (1120ms or 1200ms)/ManualThe MAX6381/MAX6382/MAX6383 are available in 3-pinReset Timeout (140ms or 150ms) (MAX6390)SC70 packages and the MAX6384–MAX6390 are avail-able in 4-pin SC70 packages.
oNegative-Going VCCTransient Immunity________________________Applications
oLow Power Consumption of 6µA at +3.6V and 3µA at +1.8VComputersoPin Compatible with
Controllers
MAX809/MAX810/MAX803/MAX6326/MAX6327/Intelligent Instruments
MAX6328/MAX6346/MAX6347/MAX6348, Critical µP and µC Power Monitoringand MAX6711/MAX6712/MAX6713Portable/Battery-Powered EquipmentoTiny 3-Pin SC70 and 4-Pin SC70 Packages
Dual Voltage Systems
Pin Configurations
Note:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". Insert reset timeout delay (see Reset TimeoutDelay table) after "D" to complete the part number. Samplestock is generally held on standard versions only (see
Standard Versions table). Standard versions have an orderincrement requirement of 2500 pieces. Nonstandard versionshave an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.
Ordering Information continuedat end of data sheet.
Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.
________________________________________________________________Maxim Integrated Products
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For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .
MAX6381–MAX6390
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
MAX6381–MAX6390
ABSOLUTE MAXIMUM RATINGS
VCC to GND..........................................................-0.3V to +6.0VRESETOpen-Drain Output....................................-0.3V to +6.0VRESET, RESET (Push-Pull Output).............-0.3V to (VCC+ 0.3V)MR, RESET IN.............................................-0.3V to (VCC+ 0.3V)Input Current (VCC).............................................................20mAOutput Current (All Pins).....................................................20mA
Continuous Power Dissipation (TA= +70°C)
3-Pin SC70 (derate 2.9mW/°C above +70°C)........235mW4-Pin SC70 (derate 3.1mW/°C above +70°C)........245mWOperating Temperature Range.........................-40°C to +125°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
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MAX6381–MAX6390
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