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文档下载 免费文档下载 http://doc.docsou.com/ MAX6381XR25D1+T 中文资料 本文档下载自文档下载网,内容可能不完整,您可以复制以下网址继续阅读或下载: http://doc.docsou.com/be5fe575faabfe0f599aa5426.html 19-1839; Rev 4; 4/07 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits General Description Features The MAX6381–MAX6390 microprocessor (?P) supervisorycircuits monitor power-supply voltages from 1.8V to?Factory-Set Reset Threshold Voltages Rangingfrom 1.58V to 4.63V in Approximately 100mV 5.0V while consuming only 3?A of supply current atIncrements 1.8V. Whenever VCCfalls below the factory-set resetthresholds, the reset output asserts and remains assert-?±2.5% Reset Threshold Accuracy Overed for a minimum reset timeout period after VTemperature (-40°C to 125°C)above the reset threshold. Reset thresholds are availableCCrises?Seven Reset Timeout Periods Available: 1ms,from 1.58V to 4.63V, in approximately 100mV incre-20ms, 140ms, 280ms, 560ms, 1120ms, ments. Seven minimum reset timeout delays ranging1200ms (min)from 1ms to 1200ms are available. 文档下载 免费文档下载 http://doc.docsou.com/ ?3 Reset Output Options The have MAX6381/MAX6384/MAX6387http://doc.docsou.com/be5fe575faabfe0f599aa5426.html a push-pullActive-Low Push-Pullactive-low reset output. The MAX6382/MAX6385/Active-High Push-PullMAX6388 have a push-pull active-high reset output,Active-Low Open-Drain and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. The?Reset Output State Guaranteed Valid Down to VMAX6384/MAX6385/MAX6386 also feature aCC= 1V debounced manual reset input (with internal pullup?Manual Reset Input (MAX6384/MAX6385/MAX6386)resistor). The MAX6387/MAX6388/MAX6389 have an?Auxiliary RESETauxiliary input for monitoring a second voltage. The(MAX6387/MAX6388/MAX6389) IN MAX6390 offers a manual reset input with a longer Vreset timeout period (1120ms or 1200ms) and a shorterCC?VCCReset Timeout (1120ms or 1200ms)/ManualReset Timeout (140ms or 150ms) (MAX6390)manual reset timeout (140ms or 150ms). The MAX6381/MAX6382/MAX6383 are available in ?Negative-Going VCCTransient Immunity3-http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlpin and6-pin?DFNpackages and the?Low Power Consumption of 6?A at 3.6V MAX6384–MAX6390 are available in 4-pin SC70 and and 3?A at 1.8V?Pin Compatible with MAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348, ComputersCritical ?P and ?Cand MAX6711/MAX6712/MAX6713 SC70 文档下载 免费文档下载 http://doc.docsou.com/ Controllers Power Monitoring?Tiny 3-Pin/4-Pin SC70 and 6-Pin ?DFNPackages Intelligent Instruments Portable/Battery-Powered EquipmentOrdering Information Dual Voltage Systems Pin Configurations after "XR", "XS", or "LT." Insert reset timeout delay (see ResetTimeout Delay table) after "D" to complete the part number.Sample stock is generally held on standard versions only (seeStandard 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 http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlnonstandard versions. Denotes a lead-free package. 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 1 文档下载 免费文档下载 http://doc.docsou.com/ For pricing, delivery, and ordering information,please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com. MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits MAX6381–MAX6390 ABSOLUTE MAXIMUM RATINGS VCC to GND..........................................................-0.3V 6.0VRESETOpen-Drain Output....................................-0.3V to RESET (push-pull output)..............-0.3V to IN.............................................-0.3V (VCC to 6.0VRESET, 0.3V)MR, (VCC to RESET 0.3V)Input http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlCurrent (VCC).............................................................20mAOutput Current (all pins).....................................................20mA Continuous Power Dissipation (TA= 3-Pin SC70 (derate 2.9mW/°C above 3.1mW/°C above 70°C) 70°C)..............235mW4-Pin SC70 (derate 70°C)..............245mW6-Pin ?DFN (derate 2.1mW/°C above 70°C)..........167.7mWOperating 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 文档下载 免费文档下载 http://doc.docsou.com/ device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating condihttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmltions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC= full range, TA= -40°C to are at TA= 125°C, unless otherwise specified. Typical values 25°C.) (Note 1) SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits ________________________________________________________________________________ _______3 MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390 (TA = 25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE (NO LOAD) POWER-DOWN RESET DELAY vs. TEMPERATURE 文档下载 免费文档下载 http://doc.docsou.com/ NORMALIZED RESET TIMEOUT PERIOD 41POWER-DOWN RESET DELAY (?s) 3937353331292725 NORMALIZED POWER-UP RESET TIMEOUT vs. TEMPERATURE MAX6381/90 toc03 98SUPPLY CURRENT (?A) 76543210 43 1.081.061http://doc.docsou.com/be5fe575faabfe0f599aa5426.html.041.021.000.980.96 0.94 -40-25-105203550658095110125 TEMPERATURE (°C) -40-25-10520355065 8095110125 文档下载 免费文档下载 http://doc.docsou.com/ TEMPERATURE (°C) -40-25-105203550658095110125 TEMPERATURE (°C) NORMALIZED RESET THRESHOLD vs. TEMPERATURE MAX6381/90 toc04 OUTPUT-VOLTAGE LOWvs. SINK CURRENT OUTPUT-VOLTAGE HIGHvs. SOURCE CURRENT 1.020NORMALIZED RESET TH RESHOLD1.0151.0101.0051.0000.9950.9900.985 1.21.00.8 3.02.52.0VOH (V) 1.51.0 VOL (V) 0.6 文档下载 免费文档下载 http://doc.docsou.com/ 0.40.200 3 6ISINK (mA) 9 12 0.500 250 500 750 1000 1250 1500 ISOURCE (?A) 0.990 -40-25-105203550658095110125 文档下载 免费文档下载 http://doc.docsou.com/ TEMPERATURE (°C) MAXIMUM TRANSIENT DURATIONvs. RESET COMPARATOR OVERDRIVE RESET IN TO RESET DELAhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlY vs. TEMPERATURE 5.35.1RESET IN DELAY (?s) 4.94.74.54.34.13.93.73.5 MAX6381/90 toc08 500 MAXIMUM TRANSIENT DURATION (?s) 450400350300250200150100500 1 10 100 5.5 1000-40-25-105203550658095110125 文档下载 免费文档下载 http://doc.docsou.com/ TEMPERATURE (°C) RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) 4_______________________________________________________________________________ _______ SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits Pin Description MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390 Detailed Description RESET Output A ?P reset input starts the ?P in a known state. These?P supervisory circuits assert reset to prevent codeexecution errors during power-up, power-down, orbrownout conditions. Resehttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlt 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. 文档下载 免费文档下载 http://doc.docsou.com/ Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390) Many ?P-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 63k?pullupresistor (1.56k?for 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 circuitryhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.html is not required. If MRis driven fromlong cables or if the device is used in a noisy environ-ment, connecting a 0.1?F 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 文档下载 免费文档下载 http://doc.docsou.com/ with no signifhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlicant lossin accuracy. ___________Applications Information In addition to issuing a reset to the ?P 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_______________________________________________________________________________ ________ SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits does not 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 Vreset threshold. For most applications, 100kCCis abovhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmle the?is ade-quate. a negative-going pulse applied to VCC, starting abovethe actual reset threshold and ending below it by themagnitude indicated (reset comparator overdrive). Thegraph indicates the typical maximum pulse width a neg-ative-going VCCtransient may have 文档下载 免费文档下载 http://doc.docsou.com/ without causing areset pulse to be issued. As the magnitude of the tran-sient increases (goes farther below the reset threshold),the maximum allowable pulse width decreases. A 0.1?Fcapacitor mounted as close as possible to VCCprovidesadditional transient immunity. Ensuring a Valid RESETOutput Down to VCC= 0V The MAX6381–MAX6390 are guaranteed to operateproperly down to V valid reset levels down to VCC= 1V. In applications that requireCC= 0V, a pulldown resistorto active-low outputs (push/pull only, Figure 2) and apullup resistor to active-high outputs (push/pull only)will ensure that the reset line is valid while the reset out-put canhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.html no longer sink or source current. This scheme ________________________________________________________________________________ _______7 MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390 Selector Guide Note:Insert reset threshold suffix (see Reset Threshold table)after "XR", "XS", or "LT." Insert reset timeout delay (see ResetTimeout Delay table) after "D" to complete the part number.Sample stock is generally held on standard versions only (seeStandard 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 文档下载 免费文档下载 http://doc.docsou.com/ D7 timing only. Denotes a lead-free package. 8 ________________________________________________________________________________ _______://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlpar SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits Pin Configurations (continued) Chip Information TRANSISTOR COUNT: 647PROCESS: BiCMOS ________________________________________________________________________________ _______9 MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390 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 .) 10______________________________________________________________________________ ________ 文档下载 免费文档下载 http://doc.docsou.com/ SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informathttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlion,go to ________________________________________________________________________________ ______11 MAX6381–MAX6390 SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits90 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to 36XAM–1836XAM12________________________________________________________________ ______________________ SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits Package Information (continued) 文档下载 免费文档下载 http://doc.docsou.com/ (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to Revision History Pages changed at Rev 4: Title on all pages, 1, 2, 5, 7–13 Maxim cannot assume responsibility for use of any circuitry other than circuitry http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlentirely 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____________________13?2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX6381–MAX6390 文档下载网是专业的免费文档搜索与下载网站,提供行业资料,考试资料,教 学课件,学术论文,技术资料,研究报告,工作范文,资格考试,word 文档, 专业文献,应用文书,行业论文等文档搜索与文档下载,是您文档写作和查找 参考资料的必备网站。 文档下载 http://doc.docsou.com/ 文档下载 免费文档下载 http://doc.docsou.com/ 亿万文档资料,等你来免费下载