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
Ordering InformationPARTTEMP. RANGEPIN-PACKAGEMAX6381XR_ _D_-T-40°C to +125°C3 SC70-3Pin Configurations
MAX6382XR_ _D_-T-40°C to +125°C3 SC70-3MAX6383XR_ _D_-T-40°C to +125°C3 SC70-3TOP VIEWNote:Insert reset threshold suffix (see Reset Threshold table)GND1after \"XR\" or \"XS\". Insert reset timeout delay (see Reset TimeoutDelay table) after \"D\" to complete the part number. SampleMAX6381stock is generally held on standard versions only (see
MAX63823VCCRESETMAX6383Standard Versions table). Standard versions have an orderincrement requirement of 2500 pieces. Nonstandard versions(RESET)2have an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.SC70*MAX6390 is available with D4 or D7 timing only.
( ) IS FOR MAX6382Ordering Information continuedat end of data sheet.
Pin Configurations continued at end of data sheet.Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.
________________________________________________________________Maxim Integrated Products
1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX6381–MAX6390元器件交易网www.cecb2b.com
SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX6390ABSOLUTE 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
(VCC= full range, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)PARAMETEROperating Voltage RangeSYMBOLVCCVCC = 5.5V, no loadVCC Supply CurrentICCVCC = 3.6V, no loadVCC = 2.5V, no loadVCC = 1.8V, no loadVCC Reset Threshold(See Reset Thresholds table)Reset Threshold TempcoVCC to Reset DelayTA = +25°CVTHTA = -40°C to +125°C∆VTH/°CVCC falling at 10mV/µs from VTH + 100mVto VTH - 100mVD1D2Reset Timeout PeriodMAX6381–MAX6389(See Reset Timeout table)D3tRPD5D6D4D7Reset Timeout PeriodMAX6390MR timeout periodtRPVCC timeout periodVILVTH < 4VMR Input VoltageVIHVILVIHVTH > 4V0.7 ✕VCC0.82.4D4D7D4D71201402805601120120014015011201200VTH -1.5%VTH -2.5%CONDITIONSMIN1.07643VTHVTH6035240280560112022402400280300224024000.3 ✕VCCVmsmsTYPMAX5.5131176VTH +1.5%VTH +2.5%µAUNITSVVppm/°Cµs2_______________________________________________________________________________________元器件交易网www.cecb2b.com
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC= full range, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMR Minimum Input Pulse Width1µsMR Glitch Rejection100nsMR to Reset Delay200nsMR Internal Pullup ResistanceMAX6381–MAX63893263100kΩMAX639080013502300ΩTA = +25°C1.2451.271.295Reset IN Input ThresholdVTHRSTTA = 0°C to +85°C1.2321.308VTA = -40°C to +125°C1.2191.321RESET IN to RESET DelayVRESETIN falling at 4mV/µs fromVTHRST4.5µs + 40mV to VTHRST - 40mVRESET IN Input Leakage CurrentIRESET IN-50±1+50nAOpen-Drain RESET OutputVCC ≥ 4.5V, ISINK = 3.2mA, reset asserted0.4VoltageVOLVCC ≥ 2.5V, ISINK = 1.2mA, reset asserted0.3VVCC ≥ 1.0V, ISINK = 80µA, reset asserted0.3Open-Drain RESET OutputLeakage CurrentILKGVCC > VTH, RESET not asserted1.0µAVCC ≥ 4.5V, ISINK = 3.2mA, reset asserted0.4VOLVCC ≥ 2.5V, ISINK = 1.2mA, reset asserted0.3VCC ≥ 1.0V, ISINK = 80µA, reset asserted0.3Push-Pull RESET Output VoltageVCC ≥ 4.5V, ISOURCE = 800µA, reset not0.8 ✕VVassertedVCCOHVCC ≥ 2.5V, ISOURCE = 500µA, reset not0.8 ✕assertedVCCVCC ≥ 4.5V, ISOURCE = 800µA, reset asserted0.8 ✕VCCVCC ≥ 2.5V, ISOURCE = 500µA, reset asserted0.8 ✕VVCCOHVCC ≥ 1.8V, ISOURCE = 150µA, reset asserted0.8 ✕Push-Pull RESET Output VoltageVCCVCC ≥ 1.0V, ISOURCE = 1µA, reset asserted0.8 V✕VCCVCC ≥ 4.5V, ISINK = 3.2mA, reset notasserted0.4VOLVCC ≥ 2.5V, ISINK = 1.2mA, reset notasserted0.3Note 1:Specifications over temperature are guaranteed by design, not production tested._______________________________________________________________________________________3
MAX6381–MAX6390元器件交易网www.cecb2b.com
SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX6390Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
MAX6381/90 toc01POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6381/90 toc02NORMALIZED RESET TIMEOUT PERIOD8SUPPLY CURRENT (µA)76543210
VCC = +5.5VVCC = +3.6V41POWER-DOWN RESET DELAY (µs)39373533312927
VCC = +1.8VVCC = +3.0V1.061.041.021.000.980.960.94
VCC = +2.5VVCC = +1.8V-40-25-105203550658095110125
TEMPERATURE (°C)
25
-40-25-105203550658095110125
TEMPERATURE (°C)
-40-25-105203550658095110125
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6381/90 toc04OUTPUT VOLTAGE LOWvs. SINK CURRENT
MAX6381/90 toc05OUTPUT VOLTAGE HIGHvs. SOURCE CURRENT
VCC = +2.5VMAX6381/90 toc061.020NORMALIZED RESET THRESHOLD1.0151.0101.0051.0000.9950.9900.985
1.21.00.8VOL (V)0.6
VCC = +3.0V0.40.200
3
6ISINK (mA)
9VCC = +4.5V3.02.52.0VOH (V)1.51.00.500
250
500
750
1000
1250
VCC = +1.8V0.990
-40-25-105203550658095110125
TEMPERATURE (°C)
12
1500
ISOURCE (µA)
MAXIMUM TRANSIENT DURATIONvs. RESET COMPARATOR OVERDRIVE
MAX6381/90 toc07RESET IN TO RESET DELAY
vs. TEMPERATURE
5.35.1RESET IN DELAY (µs)4.94.74.54.34.13.93.73.5
MAX6381/90 toc08500MAXIMUM TRANSIENT DURATION (µs)450400350300250200150100500
1
10
100
RESET ASSERTEDABOVE THIS LINE5.5
1000-40-25-105203550658095110125
TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
4______________________________________________________________________________________
MAX6381/90 toc039
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
1.08
43
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SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
Pin DescriptionPINMAX6381/MAX6384/NAMEFUNCTIONMAX6383MAX6382MAX6386/MAX6385MAX6387/MAX6390MAX6389MAX6388111111GNDGroundActive-High Push-Pull Reset Output. RESETchanges from low to high when anymonitored voltage (VCC or VRESETIN) drops—2—2—2RESETbelow the reset threshold or MR is pulled low.RESET remains high for the reset timeoutperiod after monitored voltages exceed thereset thresholds or MR is released.Active-Low Open-Drain/Push-Pull ResetOutput. RESET changes from high to low whenany monitored voltage (VCC or VRESETIN)drops below the reset threshold or MR is2—2—2—RESETpulled low. RESET remains low for the resettimeout period after the monitored voltagesexceed the reset thresholds or MR is released.Open-drain requires an external pullupresistor.Active-Low Manual Reset Input. Drive low toforce a reset. Reset remains active as longas MR is low and for the reset timeout period——33——MRafter MR is released. Leave unconnected orconnect to VCC if unused. MR has an internal63kΩ (1.35kΩ for MAX6390) pullup resistor toVCC.Auxiliary Reset Input. High-impedance inputto the auxiliary reset comparator. ConnectRESET IN to the center point of an external————33RESETINresistor voltage-divider network to set thereset threshold voltage. Reset asserts wheneither VCC or RESET IN falls below itsthreshold voltage.334444VCCSupply Voltage for the device and input forfixed VCC reset threshold monitor._______________________________________________________________________________________5
MAX6381–MAX6390元器件交易网www.cecb2b.com
SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX6390Detailed Description
RESET Output
A µP reset input starts the µP in a known state. TheseµP supervisory circuits assert reset to prevent codeexecution errors during power-up, power-down, orbrownout conditions.
Reset asserts when VCCis below the reset threshold;once VCCexceeds the reset threshold, an internal timerkeeps the reset output asserted for the reset timeoutperiod. After this interval, reset output deasserts. Resetoutput is guaranteed to be in the correct logic state forVCC≥1V.
Reset Thresholds (-40°C to +125°C)SUFFIX46454443424140393837363534333231302928272625242322212019181716VTH (min)4.514.394.274.194.104.003.903.803.713.613.513.413.323.223.123.002.932.852.732.632.562.442.342.262.132.051.951.851.761.621.54VTH (nom)4.634.504.384.304.204.104.003.903.803.703.603.503.403.303.203.083.002.932.802.702.632.502.402.312.192.102.001.901.801.671.58VTH (max)4.744.614.484.414.314.204.104.003.903.793.693.593.493.383.283.153.083.002.872.772.692.562.462.372.242.152.051.951.851.711.61Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390)
Many µP-based products require manual reset capabil-ity, allowing the operator, a test technician, or externallogic circuitry to initiate a reset. A logic low on MRasserts reset. Reset remains asserted while MRis low,and for the reset active timeout period (tRP) after MRreturns high. This input has an internal 63kΩpullupresistor (1.35kΩfor MAX6390), so it can be left uncon-nected if it is not used. MRcan be driven with TTL orCMOS logic levels, or with open-drain/collector outputs.Connect a normally open momentary switch from MRtoGND to create a manual-reset function; externaldebounce circuitry is not required. If MRis driven fromlong cables or if the device is used in a noisy environ-ment, connecting a 0.1µF capacitor from MRto GNDprovides additional noise immunity.
RESET IN Comparator
(MAX6387/MAX6388/MAX6389)
RESET IN is compared to an internal +1.27V reference.If the voltage at RESET IN is less than 1.27V, resetasserts. Use the RESET IN comparator as a user-adjustable reset detector or as a secondary power-sup-ply monitor by implementing a resistor-divider at RESETIN (shown in Figure 1). Reset asserts when either VCCor RESET IN falls below its respective threshold volt-age. Use the following equation to set the threshold:
VINTH= VTHRST (R1/R2 + 1)where VTHRST= +1.27V. To simplify the resistor selec-tion, choose a value of R2 and calculate R1:
R1 = R2 [(VINTH/VTHRST) - 1]
Since the input current at RESET IN is 50nA (max),large values can be used for R2 with no significant lossin accuracy.
___________Applications Information
In addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, theMAX6381–MAX6390 are relatively immune to short dura-tion negative-going VCCtransients (glitches).
The Typical Operating Characteristicssection shows theMaximum Transient Durations vs. Reset ComparatorOverdrive, for which the MAX6381–MAX6390 do notgenerate a reset pulse. This graph was generated using
Negative-Going VCCTransients
6_______________________________________________________________________________________
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SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
MAX6381–MAX6390VCCVINR1RESET INR2GND( ) IS FOR MAX6388MAX6387MAX6388MAX6389RESET(RESET)GNDVCCMAX6381MAX6384MAX6387RESETR1100kFigure 1. RESET IN ConfigurationFigure 2. RESET Valid to VCC = Ground CircuitReset Timeout DelaySUFFIXD1D2D3D5D6D4D7MAX6390XSD4MAX6390XSD7MIN1ms20ms140ms280ms560ms1120ms1200ms1120/140ms *1200/150ms *PARTnot work with the open-drain outputs of theMAX6383/MAX6386/MAX6389/MAX6390. The resistorvalue used is not critical, but it must be small enoughnot to load the reset output when VCCis above the resetthreshold. For most applications, 100kΩis adequate.
Standard VersionsRESETTHRESHOLD46443129MAX638_262322171646443129MAX63902623221716D4D3RESET TIMEOUT* The MAX6390 has a 1120ms or 1200ms RESETtimeout and a140ms or 150ms manual reset timeouta negative-going pulse applied to VCC, starting above theactual reset threshold and ending below it by the magni-tude indicated (reset comparator overdrive). The graphindicates the typical maximum pulse width a negative-going VCCtransient may have without causing a resetpulse to be issued. As the magnitude of the transientincreases (goes farther below the reset threshold), themaximum allowable pulse width decreases. A 0.1µFcapacitor mounted as close as possible to VCCprovidesadditional transient immunity.
The MAX6381–MAX6390 are guaranteed to operateproperly down to VCC= 1V. In applications that requirevalid reset levels down to VCC= 0, a pulldown resistor toactive-low outputs (push/pull only, Figure 2) and apullup resistor to active-high outputs (push/pull only) willensure that the reset line is valid while the reset outputcan no longer sink or source current. This scheme does
Ensuring a Valid RESETOutput Down to VCC= 0
_______________________________________________________________________________________7
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SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX6390Selector GuidePART NUMBERMAX6381MAX6382MAX6383MAX6384MAX6385MAX6386 MAX6390*MAX6387MAX6388MAX6389XXXXXXXPUSH-PULLACTIVE-LOWXXXXXXXXXXPUSH-PULLACTIVE-HIGHOPEN-DRAINACTIVE-LOWMANUAL RESETINPUT MRRESET IN*The MAX6390 offers a VCCreset timeout of 1120ms or 1200ms (min) and a manual reset timeout of 140ms or 150ms (min).Typical Operating CircuitI/O SUPPLYVCORER1RESET IN **R1MAX6381–MAX6390MR *RESET(RESET)GNDPUSHBUTTON SWITCHRESETINPUTGNDVCCCOREI/OVOLTAGEVOLTAGEµPPin Configurations (continued)
TOP VIEWGND14VCCMAX6384MAX6385MAX6386MAX6390RESET(RESET)23MR( ) IS FOR MAX6385SC70*MRis for MAX6384/MAX6385/MAX6386/MAX6390**RESET IN is for MAX6387/MAX6388/MAX6389( ) are for MAX6382/MAX6385/MAX6388
GND14VCCMAX6387MAX6388MAX6389Chip Information
TRANSISTOR COUNT: 647PROCESS: BiCMOS
RESET(RESET)23RESET IN( ) IS FOR MAX6388SC708_______________________________________________________________________________________元器件交易网www.cecb2b.com
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
Ordering Information
(continued)PARTTEMP. RANGEPIN-PACKAGEMAX6384XS_ _D_-T-40°C to +125°C4 SC70-4MAX6385XS_ _D_-T-40°C to +125°C4 SC70-4MAX6386XS_ _D_-T-40°C to +125°C4 SC70-4MAX6387XS_ _D_-T-40°C to +125°C4 SC70-4MAX6388XS_ _D_-T-40°C to +125°C4 SC70-4MAX6389XS_ _D_-T-40°C to +125°C4 SC70-4 MAX6390XS_ _D_-T*-40°C to +125°C4 SC70-4Note: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.
_______________________________________________________________________________________9
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SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381–MAX6390Package Information
SC70, 4L.EPS 10______________________________________________________________________________________
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SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
Package Information (continued)
SPE.L3 ,07CSMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600____________________11©2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX6381–MAX6390
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