4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
General Description
Features
The MAX6335/MAX6336/MAX6337 microprocessor (µP)supervisory circuits monitor the power supplies in 1.8V♦Ultra-Low 0.7V Operating Supply Voltage
to 3.3V µP and digital systems. They increase circuit reli-♦Low 3.3µA Supply Current
ability and reduce cost by eliminating external compo-nents and adjustments. They also feature a debounced♦Precision Monitoring of 1.8V and 2.5V Power-manual-reset input.
Supply VoltagesThese devices perform a single function: they assert a♦Reset Thresholds Available from 1.6V to 2.5V,reset signal whenever the Vin Approximately 100mV Incrementsbelow a preset threshold or whenever manual reset isCCsupply voltage declinesasserted. Reset remains asserted for a preset timeout♦Debounced Manual Reset period after V♦Fully Specified over Temperature
after manual reset is deasserted. The only differenceCChas risen above the reset threshold oramong the three devices is their output. The MAX6336♦Three Power-On Reset Pulse Widths Available(push/pull) and MAX6337 (open-drain) have an active-(1ms min, 20ms min, 100ms min)low RESEToutput, while the MAX6335 (push/pull) has♦Low Cost
an active-high RESET output. The MAX6335/MAX6336are guaranteed to be in the correct state for V♦Three Available Output Structures: Push/Pull to 0.7V. The MAX6337 is guaranteed to be in the cor-CCdownRESET, Push/Pull RESET, Open-Drain RESETrect state for VCCdown to 1.0V.
♦Guaranteed RESET/RESETValid to VCC= 0.7VThe reset comparator in these ICs is designed to ignore(MAX6335/MAX6336)fast transients on VCC. Reset thresholds are factory-trimmable between 1.6V and 2.5V, in approximately♦Power-Supply Transient Immunity100mV increments. There are 15 standard versions♦No External Componentsavailable (2500 piece minimum-order quantity); contactthe factory for availability of nonstandard versions♦4-Pin SOT143 Package
(10,000 piece minimum-order quantity). For space-criti-♦Pin Compatible with MAX811/MAX812 andcal applications, the MAX6335/MAX6336/MAX6337MAX6314/MAX6315
come packaged in a 4-pin SOT143.
Applications
Ordering Information
Pentium II™ ComputersPART*TEMP. RANGEPIN-PACKAGEComputersMAX6335US__D_-T-40°C to +125°C4 SOT143Controllers
MAX6336US__D_-T-40°C to +125°C4 SOT143Intelligent Instruments
MAX6337US__D_-T-40°C to +125°C4 SOT143Critical µP/µC Power Monitoring* These devices are available in factory-set VCCreset thresh-Portable/Battery-Powered Equipmentolds from 1.6V to 2.5V, in approximately 0.1V increments.Choose the desired reset threshold suffix from Table 1 andAutomotive
insert it in the blanks following “US” in the part number.Factory-programmed reset timeout periods are also available.Insert the number corresponding to the desired nominal resettimeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) inthe blank following “D” in the part number. There are 15 stan-dard versions with a required order increment of 2500 pieces.Sample stock is generally held on the standard versions onlyTypical Operating Circuit and Pin Configuration appear(see Selector Guide). Contact the factory for availability of non-at end of data sheet.
standard versions (required order increment is 10,000 pieces).All devices available in tape-and-reel only.
Selector Guide appears at end of data sheet.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.
Pentium II is a trademark of Intel Corp.
________________________________________________________________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 www.maxim-ic.com.
MAX6335/MAX6336/MAX6337元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual ResetMAX6335/MAX6336/MAX6337ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC......................................................................-0.3V to +6VPush/Pull RESET or RESET, MR............-0.3V to (VCC+ 0.3V)Open-Drain RESET..............................................-0.3V to +6VInput Current (VCC).............................................................20mAOutput Current (RESET, RESET).........................................20mA
Continuous Power Dissipation (TA= +70°C)
SOT143 (derate 4mW/°C above +70°C).....................320mWOperating Temperature Range.........................-40°C to +125°CStorage Temperature Range.............................-65°C to +160°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, MR= VCCor unconnected, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C andVCC= 3V, reset not asserted.)
PARAMETERSYMBOLCONDITIONSTA = 0°C to +85°CSupply Voltage RangeVCCTA = -40°C to +85°CTA = -40°C to +125°CSupply CurrentICCNo loadMAX6335/MAX6336MAX6337MAX6335/MAX6336MAX6337MAX6335/MAX6336MAX6337MIN0.71.00.781.21.23.03.3VTH -1.8%VTH -3%120100VTHVTH241.5301502402000.40.30.8VCC0.8VCC0.8VCC0.8VCC0.30.31VCC = 2.6VVCC = 2.6VV MR0.3VCC12VCC> VTH, RESETdeasserted 201600.420.7VCC300.5VVVVµsnsµsVkΩµAmsTYPMAX5.55.55.55.55.56.07.0VTH +1.8%VTH +3%µAVUNITSVCC = 1.8VVCC = 2.5VTA = +25°CTA = -40°C to +125°CReset ThresholdVTHMAX633_US__D_-T,Table 1VCCfalling at 10V/msMAX633_US__D1-TVVCCFalling Reset DelayReset Active Timeout PeriodRESETOutput Low Voltage(MAX6336/MAX6337)RESETOutput High Voltage(MAX6336)RESET Output Voltage(MAX6335)MRMinimum Pulse WidthMRGlitch ImmunityMRReset DelayMRThresholdMRPull-Up ResistanceRESETOutput LeakageCurrent (MAX6337)2
µstRPVOLVOHVOHVOLMAX633_US__D2-TMAX633_US__D3-TResetassertedReset notassertedResetassertedReset notassertedISINK= 50µA, VCC ≥1.0VISINK= 500µA, VCC ≥1.8VISOURCE= 200µA, VCC ≥1.8VISOURCE= 500µA, VCC ≥2.7VISOURCE= 1µA, VCC ≥1.0VISOURCE= 200µA, VCC ≥1.8VISINK= 500µA, VCC ≥1.8VISINK= 1.2mA, VCC ≥2.7V_______________________________________________________________________________________
元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
__________________________________________Typical Operating Characteristics
(Reset not asserted, TA= +25°C, unless otherwise noted.)
NORMALIZED RESET TIMEOUT PERIOD
OUTPUT VOLTAGE LOW SUPPLY CURRENT vs. TEMPERATURE
vs. TEMPERATURE
vs. SUPPLY VOLTAGE
4.011.0502-c-780
3-co3ott / 3.8763/6DVTH = 2.2V3/53V7TH = 2.5V3/6/O1.04035I3703.633R6)I3/SINK = 500µA5336EX1.030XAMVAPM TmRESET ASSERTED6XA3.4(60MU VO1.020WCC = 2.5VEOML )50A3.2IT1.010Eµ G(T EC3.0CS1.000ATL40ETIA = +25°C2.8RO VD0.990V TE30TA = +85°C2.6CC = 1.8VZUILA0.980PTU2.4M20RO0.970ON2.2RESET NOT ASSERTED0.96010TA = -40°C2.00.950
0-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
0.50
1.00
1.50
2.00
2.50
3.00
TEMPERATURE (°C)TEMPERATURE (°C)VCC (V)
OUTPUT VOLTAGE HIGH MAXIMUM TRANSIENT DURATIONVCC FALLING PROPAGATION DELAY
vs. SUPPLY VOLTAGE
vs. RESET COMPARATOR OVERDRIVE
vs. TEMPERATURE
16060054-80
6-c-ccooott ) 74VVTH = 2.2Vt 7)33s3//m14063( I/SOURCE = 100µA63µ/(5 )50033//570233H3366ORESET ASSERTED3 36NX)XV120XAOIAsA MµM-MT( ACCR400 Y60AVUL(100DE HTD 50VGNNCC FALLING AT 1V/msIEH80I300RESET OCCURSOI SETGNAAAG40TRTL60 OVTM200APOR TU40A = +25°CUTP30VPA = -40°CMCC FALLING AT 10V/msIXTAUO20M100RESET DOESNOT OCCUR20TA = +85°C0
010
0.50.751.01.251.51.752.02.252.5
0.1
1101001000
-60-40-20020406080100
VCC (V)
RESET COMPARATOR OVERDRIVE (mV)
TEMPERATURE (°C)
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MAX6335/MAX6336/MAX6337元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual ResetMAX6335/MAX6336/MAX6337Pin DescriptionPINMAX63351MAX6336MAX63371NAMEGNDGroundActive-Low Reset Output. RESETremains low while VCCis below the resetthreshold, or MRis asserted and for a reset timeout period (tRP) after VCCrises above the reset threshold, or MRis deasserted. RESETon theMAX6337 is open-drain. Active-High Reset Output. RESET remains high while VCCis below thereset threshold, or MRis asserted and for a reset timeout period (tRP) afterVCCrises above the reset threshold, or MRis deasserted. RESET alsoasserts when MRis low.Manual-Reset Input. A logic low on MRasserts reset. Reset remainsasserted as long as MRis low, and for the reset timeout period (tRP) afterMRgoes high. Leave unconnected or connect to VCCif not used.Supply Voltage (0.7V to 5.5V)FUNCTION—2RESET2—RESET3434MRVCCApplications Information
Manual-Reset Inputs
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 after MRreturnshigh. MRhas an internal 20kΩpull-up resistor, so it canbe left unconnected if not used. Connect a normallyopen momentary switch from MRto GND to create amanual-reset function; external debounce circuitry isnot required.
signal. As the amplitude of the transient increases, themaximum allowable pulse width decreases.
Interfacing to µPs withBidirectional Reset Pins
Since the RESEToutput on the MAX6337 is open-drain,this device interfaces easily with µPs that have bidirec-tional reset pins, such as the Motorola 68HC11.Connecting the µP supervisor’s RESEToutput directlyto the microcontroller’s (µC’s) RESETpin with a singlepull-up resistor allows either device to assert reset(Figure 1).
In addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devicesare relatively immune to short-duration, negative-goingVCCtransients (glitches). TheTypical OperatingCharacteristicsshow the Maximum Transient Durationvs. Reset Comparator Overdrive graph. The graphshows the maximum pulse width that a negative-goingVCCtransient may typically have without issuing a reset
4
When VCCfalls below 1V and approaches the minimumoperating voltage of 0.7V, push/pull-structured resetsinking (or sourcing) capabilities decrease drastically.High-impedance CMOS-logic inputs connected to theRESETpin can drift to indeterminate voltages. Thisdoes not present a problem in most cases, since mostµPs and circuitry do not operate at VCCbelow 1V. Forthe MAX6336, where RESETmust be valid down to 0,adding a pull-down resistor between RESETand GNDremoves stray leakage currents, holding RESETlow
Ensuring a Valid Reset Output
down to VCC = 0
VCCVCCVCCµPMOTOROLA68HCXXRESETINPUTNegative-Going VCCTransients
MAX6337MRRESETGNDGNDFigure 1. Interfacing to µPs with Bidirectional Reset Pins
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元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
Table 1. Factory-Trimmed ResetVCCThresholds*
RESET THRESHOLDTA= +25°CTA= -40°C to +125°CMAX6336SUFFIXMINTYPMAXMINMAXMRRESETMAX633_US25D_2.462.502.552.432.58MAX633_US24D_2.362.402.442.332.47(a)GND100kMAX633_US23D_2.262.302.342.232.37MAX633_US22D_2.162.202.242.132.27MAX633_US21D_2.062.102.142.042.16VCCMAX633_US20D_1.962.002.041.942.06MAX633_US19D_1.871.901.931.841.96100k*MAX633_US18D_1.771.801.831.751.85MAX6335MAX633_US17D_1.671.701.731.651.75MRRESETMAX633_US16D_1.571.601.631.551.65*Factory-trimmed reset thresholds are available in approximately(b)GND100mV increments, with a ±1.8% room-temperature variance.
*ASSUMES HIGH-Z RESET INPUT TO THE µPFigure 2. Ensuring Reset Valid down to VCC= 0
(Figure 2a). The pull-down resistor value is not critical;100kΩis large enough not to load RESET, and smallenough to pull it low. For the MAX6335, where RESETmust be valid to VCC= 0, a 100kΩpull-up resistorbetween RESET and VVCCwill hold RESET high whenCCfalls below 0.7V (Figure 2b).
Since the MAX6337 has an open-drain, active-low out-put, it typically uses a pull-up resistor. With this device,RESET will most likely not maintain an active condition,but will drift to a non-active level due to the pull-upresistor and the reduced sinking capability of the open-drain device. Therefore, this device is not recommend-ed for applications where the RESETpin is required tobe valid down to VCC= 0.
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MAX6335/MAX6336/MAX6337元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual ResetMAX6335/MAX6336/MAX6337Selector Guide (standard versions*)
PART
MAX6335US23D3-TMAX6335US22D3-TMAX6335US20D3-TMAX6335US18D3-TMAX6335US16D3-TMAX6336US23D3-TMAX6336US22D3-TMAX6336US20D3-TMAX6336US18D3-TMAX6336US16D3-TMAX6337US23D3-TMAX6337US22D3-TMAX6337US20D3-TMAX6337US18D3-TMAX6337US16D3-T
OUTPUT STAGEPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETPush/Pull RESETOpen-Drain RESETOpen-Drain RESETOpen-Drain RESETOpen-Drain RESETOpen-Drain RESET
NOMINAL VTH (V)
2.302.202.001.801.602.302.202.001.801.602.302.202.001.801.60
MINIMUM RESET TIMEOUT (ms)
100100100100100100100100100100100100100100100
SOT TOP MARK
KABQKAARKABPKAAQKAAPKAAWKAAVKAAUKAATKAASKABSKAAZKABRKAAYKAAX
* Sample stock is generally held on all standard versions.
Pin Configuration
TOP VIEWVCCTypical Operating Circuit
GND14VCCVCCVCCMAX6335MAX6336MAX6337MAX6335MAX6336MRRESET(RESET)GNDRESETµPRESET(RESET)23MRGNDSOT143( ) ARE FOR MAX6335PUSHBUTTONSWITCH( ) ARE FOR MAX63356_______________________________________________________________________________________
元器件交易网www.cecb2b.com4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
Chip InformationTRANSISTOR COUNT:505
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to www.maxim-ic.com/packages.)
SPE.L4 341-TOSPACKAGE OUTLINE, SOT-143, 4L21-0052E11Maxim 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 _____________________7©2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
MAX6335/MAX6336/MAX6337
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