MAX6386XS29D3+中文资料 - 360文档中心

MAX4636中文资料

元器件交易网
Fast, Low-Voltage, Dual 4Ω SPDT CMOS Analog Switches MAX4635/MAX4636
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) V+, IN_ .....................................................................-0.3V to +6V COM_, NC_, NO_ (Note 1) .......................... -0.3V to (V+ + 0.3V) Continuous Current into Any Terminal .............................±30mA Peak Current into COM_, NC_, NO_ (pulsed at 1ms, 10% duty cycle).................................±100mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 4.7mW/°C above +70°C) ............330mW 10-Pin Thin QFN (derate 24.4mW/°C above +70°C) ..1951mW Operating Temperature Range .......................... -40°C to +85°C Storage Temperature Range ........................... -65°C to +150°C Lead Temperature (soldering, 10s) ............................... +300°C

MAX6349VHUT中文资料

The MAX6329/MAX6349 are low-dropout, micropower linear voltage regulators with integrated microprocessor reset circuits. Each is available with preset +3.3V, +2.5V, +1.8V, or adjustable output voltages and can deliver up to 150mA load current. Employing internal Pchannel MOSFET pass transistors, the devices consume only 25µA supply current, independent of the device load. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery powered portable equipment.
________________________Applications
Hand-Held Instruments
Electronic Planners
Palm Top Computers
PCMCIA Cards
USB Devices
Cellular Telephones
Cordless Telephones
The MAX6329/MAX6349 are optimized for use with a 1µF (min) output capacitor. The regulator output voltage is adjustable with an external resistor-divider network at SET (reset threshold voltages track the desired output voltage). Each device includes thermal shutdown protection, output short-circuit protection, and reverse leakage protection. The MAX6329 includes a shutdown feature to reduce regulator current below 1µA (max) and the MAX6349 offers a manual reset input to assert a microprocessor reset while the regulator output is within specification.

MAX6386资料

General DescriptionThe MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current at +1.8V. Whenever V CC falls below the factory-set reset thresholds, the reset output asserts and remains assert-ed for a minimum reset timeout period after V CC rises above the reset threshold. Reset thresholds are available from +1.58V to +4.63V, in approximately 100mV incre-ments. Seven minimum reset timeout delays ranging from 1ms to 1200ms are available.The MAX6381/MAX6384/MAX6387 have a push-pull active-low reset output. The MAX6382/MAX6385/MAX6388 have a push-pull active-high reset output,and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. The MAX6384/MAX6385/MAX6386 also feature a debounced manual reset input (with internal pullup resistor). The MAX6387/MAX6388/MAX6389 have an auxiliary input for monitoring a second voltage. The MAX6390 offers a manual reset input with a longer V CC reset timeout period (1120ms or 1200ms) and a shorter manual reset timeout (140ms or 150ms).The MAX6381/MAX6382/MAX6383 are available in 3-pin SC70 packages and the MAX6384–MAX6390 are avail-able in 4-pin SC70 packages.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered Equipment Dual Voltage SystemsFeatureso Factory-Set Reset Threshold Voltages Ranging from +1.58V to +4.63V in Approximately 100mV Increments o ±2.5% Reset Threshold Accuracy Over Temperature (-40°C to +125°C)o Seven Reset Timeout Periods Available: 1ms,20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min)o 3 Reset Output OptionsActive-Low Push-Pull Active-High Push-Pull Active-Low Open-Draino Reset Output State Guaranteed Valid Down to V CC = 1Vo Manual Reset Input (MAX6384/MAX6385/MAX6386)o Auxiliary RESET IN(MAX6387/MAX6388/MAX6389)o V CC Reset Timeout (1120ms or 1200ms)/Manual Reset Timeout (140ms or 150ms) (MAX6390)o Negative-Going V CC Transient Immunity o Low Power Consumption of 6µA at +3.6V and 3µA at +1.8V o Pin Compatible withMAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348, and MAX6711/MAX6712/MAX6713o Tiny 3-Pin SC70 and 4-Pin SC70 PackagesMAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits________________________________________________________________Maxim Integrated Products1Pin Configurations19-1839; Rev 1; 04/01Ordering InformationOrdering Information continued at end of data sheet.Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.Note:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". Insert reset timeout delay (see Reset Timeout 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 order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..........................................................-0.3V to +6.0V RESET Open-Drain Output....................................-0.3V to +6.0V RESET , RESET (Push-Pull Output).............-0.3V to (V CC + 0.3V)MR , RESET IN.............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (All Pins).....................................................20mAContinuous Power Dissipation (T A = +70°C)3-Pin SC70 (derate 2.9mW/°C above +70°C)........235mW 4-Pin SC70 (derate 3.1mW/°C above +70°C)........245mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________3M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 4______________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)215436789-40-105-25203550658095110125SUPPLY CURRENT vs. TEMPERATURE(NO LOAD)TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )25292735333137394143-40-105-25203550658095110125POWER-DOWN RESET DELAYvs. TEMPERATURETEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )0.940.980.961.021.001.061.041.08-40-10520-253550658095110125NORMALIZED POWER-UP RESET TIMEOUTvs. TEMPERATUREM A X 6381/90 t o c 03TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D0.9900.9851.0150.9950.9901.0001.0051.0101.020-40-10520-253550958011065125M A X 6381/90 t o c 04TEMPERATURE (°C)N O R M A L I Z E D R E S E TT H R E S H O L D NORMALIZED RESET THRESHOLDvs. TEMPERATURE00.40.20.80.61.01.2063912OUTPUT VOLTAGE LOW vs. SINK CURRENTI SINK (mA)V O L (V )01.00.52.01.52.53.00500750250100012501500OUTPUT VOLTAGE HIGH vs. SOURCE CURRENTI SOURCE (µA)V O H (V )45001100010010MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE15050350250500200100400300RESET COMPARATOR OVERDRIVE, V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N (µs )3.53.93.74.54.34.14.74.95.35.15.5-40-105-25203550658095110125RESET IN TO RESET DELAYvs. TEMPERATUREM A X 6381/90 t o c 08TEMPERATURE (°C)R E S E T I N D E L A Y (µs )MAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________5M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 6_______________________________________________________________________________________Detailed DescriptionRESET OutputA µP reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions.Reset asserts when V CC is below the reset threshold;once V CC exceeds the reset threshold, an internal timer keeps the reset output asserted for the reset timeout period. After this interval, reset output deasserts. Reset output is guaranteed to be in the correct logic state for V CC ≥1V.Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390)Many µP-based products require manual reset capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low,and for the reset active timeout period (t RP ) after MR returns high. This input has an internal 63k Ωpullup resistor (1.35k Ωfor MAX6390), so it can be left uncon-nected if it is not used. MR can be driven with TTL or CMOS logic levels, or with open-drain/collector outputs.Connect a normally open momentary switch from MR to G ND to create a manual-reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environ-ment, connecting a 0.1µF capacitor from MR to G ND provides 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, reset asserts. 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 RESET IN (shown in Figure 1). Reset asserts when either V CC or RESET IN falls below its respective threshold volt-age. Use the following equation to set the threshold:V INTH = V THRST (R1/R2 + 1)where V THRST = +1.27V. To simplify the resistor selec-tion, choose a value of R2 and calculate R1:R1 = R2 [(V INTH /V THRST ) - 1]Since the input current at RESET IN is 50nA (max),large values can be used for R2 with no significant loss in accuracy.___________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, the MAX6381–MAX6390 are relatively immune to short dura-tion negative-going V CC transients (glitches).The Typical Operating Characteristics section shows the Maximum Transient Durations vs. Reset Comparator Overdrive, for which the MAX6381–MAX6390 do not generate a reset pulse. This graph was generated usinga negative-going pulse applied to V CC , starting above the actual reset threshold and ending below it by the magni-tude indicated (reset comparator overdrive). The graph indicates the typical maximum pulse width a negative-going V CC transient may have without causing a reset pulse to be issued. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF capacitor mounted as close as possible to V CC provides additional transient immunity.Ensuring a Valid RESET Output Down to V CC = 0The MAX6381–MAX6390 are guaranteed to operate properly down to V CC = 1V. In applications that require valid reset levels down to V CC = 0, a pulldown resistor to active-low outputs (push/pull only, Figure 2) and a pullup resistor to active-high outputs (push/pull only) will ensure that the reset line is valid while the reset output can no longer sink or source current. This scheme doesnot work with the open-drain outputs of the MAX6383/MAX6386/MAX6389/MAX6390. The resistor value used is not critical, but it must be small enough not to load the reset output when V CC is above the reset threshold. For most applications, 100k Ωis adequate.MAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________7M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 8Selector GuideChip InformationTRANSISTOR COUNT: 647PROCESS: BiCMOS*MR is for MAX6384/MAX6385/MAX6386/MAX6390**RESET IN is for MAX6387/MAX6388/MAX6389( ) are for MAX6382/MAX6385/MAX6388Pin Configurations (continued)MAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________9Ordering Information(continued)Note:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". Insert reset timeout delay (see Reset Timeout 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 order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 10______________________________________________________________________________________Package InformationSC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. 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–MAX6390Package Information (continued)元器件交易网。

MAX3292ESD+中文资料

Typical Operating Circuit and Functional Diagram
RPSET* RPSET*
1µF PEE (PSET) CPSET* VCC 14 1 (VCCD) RO RE DE DI 2 3 4 5 Z 10 Y 9 R = ZO R = ZO 11 12 B A 13 R = ZO R = ZO 9 10 Y Z A 12 B 11 PEE (PSET) CPSET* VCC 14 1 (VCCD)
________________________Applications
Long-Distance, High-Speed RS-485/RS-422 Communications Telecommunications Industrial-Control Local Area Networks
MAX3291CPD MAX3291ESD MAX3291EPD MAX3292CSD MAX3292CPD MAX3292ESD MAX3292EPD
DC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, VCC = +5V ±5%, RPSET = 0 (MAX3292), VCC = VCCD (MAX3292), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER DRIVER Differential Driver Output Differential Driver Output with Preemphasis Differential Driver Preemphasis Ratio Change in Magnitude of Differential Output Voltage (Normal and Preemphasis) Driver Common-Mode Output Voltage (Normal and Preemphasis) Change in Magnitude of Common-Mode Voltage (Normal and Preemphasis) Change in Magnitude of Common-Mode Output Voltage (Normal to Preemphasis) Input High Voltage Input Low Voltage Input Current PEE Input Current (MAX3291) PSET Input Current (MAX3292) Output Leakage (Y and Z) Driver Short-Circuit Output Current 2 VOD VODP DPER ∆VOD, ∆VODP Figure 1 R = 27Ω Figure 1, R = 27Ω (Note 3) Figure 1, R = 27Ω (Note 4) R = 27Ω No load (Note 2) 2.4 1.65 2.0 2.35 1.5 5.0 5.25 V V V SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX6398中文资料

General DescriptionThe MAX6397/MAX6398 are small, high-voltage overvolt-age protection circuits. These devices disconnect the output load or limit the output voltage during an input overvoltage condition. These devices are ideal for appli-cations that must survive high-voltage transients such as those found in automotive and industrial applications.The MAX6397/MAX6398 monitor the input or output voltages and control an external n-channel MOSFET to isolate or limit the load from overvoltage transient energy.When the monitored input voltage is below the user-adjustable overvoltage threshold, the external n-channel MOSFET is turned on by the GATE output. In this mode,the internal charge pump fully enhances the n-channel MOSFET with a 10V gate-to-source voltage.When the input voltage exceeds the overvoltage thresh-old, the protection can disconnect the load from the input by quickly forcing the GATE output low. In some applications, disconnecting the output from the load is not desirable. In these cases, the protection circuit can be configured to act as a voltage limiter where the GATE output sawtooths to limit the voltage to the load.The MAX6397 also offers an always-on linear regulator that is capable of delivering up to 100mA of output current. This high-voltage linear regulator consumes only 37µA of quiescent current.The regulator is offered with output options of 5V, 3.3V,2.5V, or 1.8V. An open-drain, power-good output (POK)asserts when the regulator output falls below 92.5% or 87.5% of its nominal voltage.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions. The devices operate over a wide 5.5V to 72V supply voltage range, are available in small TDFN packages, and are fully specified from -40°C to +125°C.ApplicationsAutomotive Industrial FireWire ®Notebook Computers Wall Cube Power DevicesFeatures♦5.5V to 72V Wide Supply Voltage Range♦Overvoltage Protection Controllers Allow User to Size External n-Channel MOSFETs ♦Internal Charge-Pump Circuit Ensures MOSFET Gate-to-Source Enhancement for Low R DS(ON)Performance ♦Disconnect or Limit Output from Input During Overvoltage Conditions ♦Adjustable Overvoltage Threshold ♦Thermal-Shutdown Protection♦Always-On, Low-Current (37µA) Linear Regulator Sources Up to 100mA (MAX6397)♦Fully Specified from -40°C to +125°C (T J )♦Small, Thermally Enhanced 3mm x 3mm TDFN PackageMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V________________________________________________________________Maxim Integrated Products1Pin ConfigurationsOrdering Information19-3668; Rev 3; 1/07For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Selector Guide and Typical Operating Circuit appear at end of data sheet.FireWire is a registered trademark of Apple Computer, Inc.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V= 14V; C = 6000pF, C = 4.7µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +25°C.)(Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional oper-ation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.(All pins referenced to GND, unless otherwise noted.)IN, GATE, OUT............................................................-0.3V to +80V SHDN ..................................................................-0.3V to (IN + 0.3V)GATE to OUT.................................................................-0.3 to +20V SET, REG, POK...........................................................-0.3V to +12V Maximum Current:IN, REG...............................................................................350mA All Remaining Pins...................................................................50mAContinuous Power Dissipation (T A = +70°C)6-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW 8-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW Operating Temperature Range (T A )......................-40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature Range.................................-65°C to +150°C Lead Temperature................................................................+300°CMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = 14V; C GATE = 6000pF, C REG = 4.7µF, T A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = T J = +25°C.)(Note 1)Note 1:Specifications to -40°C are guaranteed by design and not production tested.Note 2:The MAX6397/MAX6398 power up with the external FET in off mode (V GATE = GND). The external FET turns on t START after thedevice is powered up and all input conditions are valid.Note 3:For accurate overtemperature shutdown performance, place the device in close thermal contact with the external MOSFET.Note 4:Dropout voltage is defined as V IN - V REG when V REG is 2% below the value of V REG for V IN = V REG (nominal) + 2V.Note 5:Operations beyond the thermal dissipation limit may permanently damage the device.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 4_______________________________________________________________________________________Typical Operating Characteristics(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)40608010012014016002010304050607080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )1007525500-259010011012013014015016017018080-50125405060708090100110120020406080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y CU R R E N T (µA )8010090120110130140-502550-25075100125SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L YC U R R E N T (µA )20302540354550040206080SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE (MAX6397)INPUT VOLTAGE (V)S U P P L YC U R R E N T (µA )103050700642810121416182020406080SHUTDOWN SUPPLY CURRENTvs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P PL Y C U R R E N T (µA )0642810124121068141618202224GATE-DRIVE VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)V G A T E - V O U T (V )4.04.64.44.25.04.85.85.65.45.26.0-50-250255075100125UVLO THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 08TEMPERATURE (°C)V U V L O (V )SET THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 09TEMPERATURE (°C)S E T T H R E S H O L D (V )1007525500-251.2041.2081.2121.2161.2201.2241.2281.2321.2361.2401.200-50125MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________516.016.316.216.116.516.416.916.816.716.617.0-50-25255075100125GATE-TO-OUT CLAMP VOLTAGEvs. TEMPERATUREM A X 6397-98 t o c 10TEMPERATURE (°C)G A T E -T O -O U T C L A M P V O L T A G E (V )00.40.20.80.61.21.01.41.81.62.0040608020100120140160180DROPOUT VOLTAGE vs. REG LOAD CURRENTREG LOAD CURRENT (mA)D R O P O U T V O L T A GE (V )4.905.004.955.105.055.155.20-40-10520-253550658095110125REG OUTPUT VOLTAGEvs. LOAD CURRENT AND TEMPERATURETEMPERATURE (°C)R E G O U T P U T V O L T A G E (V )4.04.64.44.24.85.05.21601204080200240280320360400MAXIMUM REG OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURELOAD CURRENT (mA)R E G O U T P U T V O L T A G E (V )POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (Hz)P S R R (d B )1M 100k 10k 1k 100-60-50-40-30-20-100-701010M4ms/divSTARTUP WAVEFORM(R LOAD = 100Ω, C IN = 10µF, C OUT = 10µF)V IN 10V/divMAX6397-98 toc16V GATE 10V/div V OUT 10V/div I OUT200mA/div400µs/divSTARTUP WAVEFORM FROM SHUTDOWN(C IN = 10µF, C OUT = 10µF)V 2V/divV GATE 10V/divV OUT 10V/div I OUT200mA/divR LOAD = 100ΩTypical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)GATE-DRIVE VOLTAGE vs. TEMPERATUREM A X 6397-98 t o c 14TEMPERATURE (°C)G A T E -D R I V E V O L T A G E (V )1007525500-2510.45510.46010.46510.47010.47510.48010.48510.49010.49510.50010.450-50125M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)200µs/divOVERVOLTAGE SWITCH FAULTV IN 20V/divV GATE 20V/div V OUT 20V/div V REG 5V/divV OV = 30V1ms/divVOLTAGE LIMIT FAULTV IN 20V/divV GATE 20V/divV OUT 20V/div V REG 5V/divV OV = 30V400µs/divTRANSIENT RESPONSEV IN 10V/divV REG100mV/divC REG = 10µF I REG = 10mA1ms/divREG LOAD-TRANSIENT RESPONSEV REGAC-COUPLED 500mV/divI REG100mA/divC REG = 10µF1ms/divREGULATOR STARTUP WAVEFORMV IN 10V/divV POK 2V/divV REG 2V/divI REG = 10mA100µs/divREGULATOR POK ASSERTIONV REG 2V/divI REG200mA/div V POK 2V/divI REG = 00V0V0ADetailed Description The MAX6397/MAX6398 are ultra-small, low-current, high-voltage protection circuits for automotive applica-tions that must survive load dump and high-voltage transient conditions. These devices monitor the input/ output voltages and control an external n-channel MOSF ET to isolate the load or to regulate the output voltage from overvoltage transient energy. The con-troller allows system designers to size the external MOSFET to their load current and board size.The MAX6397/MAX6398 drive the MOSF ET’s gate high when the monitored input voltage is below the adjustable overvoltage threshold. An internal charge-pump circuit provides a 5V to 10V gate-to-source drive (see the Typical Operating Characteristics) to ensure low input-to-load voltage drops in normal operating modes. When the input voltage rises above the user-adjusted overvoltage threshold, GATE pulls to OUT, turning off the MOSFET.The MAX6397/MAX6398 are configurable to operate as overvoltage protection switches or as closed-looped volt-age limiters. In overvoltage protection switch mode, theinput voltage is monitored. When an overvoltage condi-tion occurs at IN, GATE pulls low, disconnecting the loadfrom the power source, and then slowly enhances upon removal of the overvoltage condition. In overvoltagelimit mode, the output voltage is monitored and theMAX6397/MAX6398 regulate the source of the external MOSFET at the adjusted overvoltage threshold, allowing devices within the system to continue operating during an overvoltage condition.The MAX6397/MAX6398 undervoltage lockout (UVLO) function disables the devices as long as the input remains below the 5V (typ) UVLO turn-on threshold. TheMAX6397/MAX6398 have an active-low SHDN input toturn off the external MOSFET, disconnecting the load and reducing power consumption. After power is applied and SHDN is driven above its logic-high voltage, there is a100µs delay before GATE enhancement commences.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V _______________________________________________________________________________________7M A X 6397/M A X 6398The MAX6397 integrates a high-input-voltage, low-qui-escent-current linear regulator in addition to an over-voltage protector circuit. The linear regulator remains enabled at all times to power low-current “always-on”applications (independent of the state of the external MOSF ET). The regulator is offered with several stan-dard output voltage options (5V, 3.3V, 2.5V, or 1.8V).An open-drain power-good output notifies the system if the regulator output falls to 92.5% or 87.5% of its nomi-nal voltage. The MAX6397’s REG output operates inde-pendently of the SHDN logic input.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions.Linear Regulator (MAX6397 Only)The MAX6397 is available with 5.0V, 3.3V, 2.5V, and 1.8V factory-set output voltages. Each regulator sources up to 100mA and includes a current limit of 230mA. The linear regulator operates in an always-on condition regardless of the SHDN logic. For fully specified operation, V IN must be greater than 6.5V for the MAX6397L/M (5V regulator output). The actual output current may be limited by the operating condition and package power dissipation.Power-OK OutputPOK is an open-drain output that goes low when REG falls to 92.5% or 87.5% (see the Selector Guide ) of its nominal output voltage. To obtain a logic-level output,connect a pullup resistor from POK to REG or another system voltage. Use a resistor in the 100k Ωrange to minimize current consumption. POK provides a valid logic-output level down to V IN = 1.5V.GATE VoltageThe MAX6397/MAX6398 use a high-efficiency charge pump to generate the GATE voltage. Upon V IN exceed-ing the 5V (typ) UVLO threshold, GATE enhances 10V above IN (for V IN ≥14V) with a 75µA pullup current. An overvoltage condition occurs when the voltage at SET pulls above its 1.215V threshold. When the threshold is crossed, GATE falls to OUT within 100ns with a 100mA (typ) pulldown current. The MAX6397/MAX6398 include an internal clamp to OUT that ensures GATE is limited to 18V (max) above OUT to prevent gate-to-source damage to the external FET.The GATE cycle during overvoltage limit and overvolt-age switch modes are quite similar but have distinct characteristics. In overvoltage switch mode (Figure 2a),GATE is enhanced to V IN + 10V while the monitored IN voltage remains below the overvoltage fault threshold (SET < 1.215V). When an overvoltage fault occurs (SET ≥1.215V), GATE is pulled one diode below OUT, turn-ing off the external F ET and disconnecting the load from the input. GATE remains low (FET off) as long as V IN is above the overvoltage fault threshold. As V IN falls back below the overvoltage fault threshold (-5% hys-teresis) GATE is again enhanced to V IN + 10V.In overvoltage limit mode (Figure 2b), GATE is enhanced to V IN + 10V. While the monitored OUT voltage remains below the overvoltage fault threshold (SET < 1.215V).When an overvoltage fault occurs (SET ≥1.215V),GATE is pulled low one diode drop below OUT until OUT drops 5% below the overvoltage fault threshold.GATE is then turned back on until OUT again reaches the overvoltage fault threshold and GATE is again turned off.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 8_______________________________________________________________________________________GATE cycles on-off-on-off-on in a sawtooth waveform until OUT remains below the overvoltage fault threshold and GATE remains constantly on (V IN + 10V). The over-voltage limiter’s sawtooth GATE output operates the MOSFET in a switched-linear mode while the input volt-age remains above the overvoltage fault threshold. The sawtooth frequency depends on the load capacitance,load current, and MOSFET turn-on time (GATE charge current and GATE capacitance).GATE goes high when the following startup conditions are met: V IN is above the UVLO threshold, SHDN is high, an overvoltage fault is not present and the device is not in thermal shutdown.Overvoltage MonitoringWhen operating in overvoltage mode, the MAX6397/MAX6398 feedback path (F igure 3) consists of IN,SET’s internal comparator, the internal gate charge pump, and the external n-channel MOSFET resulting in a switch-on/off function. When the programmed over-voltage threshold is tripped, the internal fast compara-tor turns off the external MOSFET, pulling GATE to OUT within t OV and disconnecting the power source from the load. When IN decreases below the adjusted over-voltage threshold, the MAX6397/MAX6398 slowly enhance GATE above OUT, reconnecting the load to the power source.Overvoltage LimiterWhen operating in overvoltage limiter mode, the MAX6397/MAX6398 feedback path (F igure 4) consists of OUT, SET’s internal comparator, the internal gate charge pump and the external n-channel MOSF ET,which results in the external MOSF ET operating as a voltage regulator.During normal operation, GATE is enhanced 10V above OUT. The external MOSFET source voltage is monitored through a resistor-divider between OUT and SET. When OUT rises above the adjusted overvoltage threshold, an internal comparator sinks the charge-pump current, dis-charging the external GATE, regulating OUT at the set overvoltage threshold. OUT remains active during the overvoltage transients and the MOSFET continues to con-duct during the overvoltage event, operating in switched-linear mode.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________9V GATE 10V/divV OUT 10V/divV IN 10V/div10ms/divV GATE 10V/divV OUT 10V/divV IN 10V/div4ms/divM A X 6397/M A X 6398As the transient begins decreasing, OUT fall time will depend on the MOSF ET’s GATE charge, the internal charge-pump current, the output load, and the tank capacitor at OUT.For fast-rising transients and very large-sized MOSFETs,add an additional external bypass capacitor from GATE to GND to reduce the effect of the fast-rising voltages at IN. The external capacitor acts as a voltage-divider working against the MOSF ETs’ drain-to-gate capaci-tance. For a 6000pF C gd , a 0.1µF capacitor at GATE will reduce the impact of the fast-rising V IN input.Caution must be exercised when operating the MAX6397/MAX6398 in voltage-limiting mode for long durations. If the V IN is a DC voltage greater than the MOSFET’s maximum gate voltage, the FET will dissipate power continuously. To prevent damage to the external MOSFET, proper heatsinking should be implemented.Applications InformationLoad DumpMost automotive applications run off a multicell, 12V lead-acid battery with a nominal voltage that swings between 9V and 16V (depending on load current,charging status, temperature, battery age, etc.). The battery voltage is distributed throughout the automobile and is locally regulated down to voltages required by the different system modules. Load dump occurs when the alternator is charging the battery and the battery becomes disconnected. Power in the alternator (essen-tially an inductor) flows into the distributed power sys-tem and elevates the voltage seen at each module. The voltage spikes have rise times typically greater than 5ms and decays within several hundred milliseconds but can extend out to 1s or more depending on thecharacteristics of the charging system (F igure 5).These transients are capable of destroying semicon-ductors on the first ‘fault event.’Setting Overvoltage ThresholdsSET provides an accurate means to set the overvoltage level for the MAX6397/MAX6398. Use a resistor-divider to set the desired overvoltage condition (Figure 6). SET has a rising 1.215V threshold with a 5% falling hysteresis.Begin by selecting the total end-to-end resistance,R TOTAL = R1 + R2. Choose R TOTAL to yield a total cur-rent equivalent to a minimum 100 x I SET (SET’s input bias current) at the desired overvoltage threshold.For example:With an overvoltage threshold set to 20V:R TOTAL < 20V/(100 x I SET )where I SET is SET’s 50nA input bias current.R TOTAL < 4M ΩUse the following formula to calculate R2:where V TH is the 1.215V SET rising threshold and V OV is the overvoltage threshold.R2 = 243k Ω, use a 240k Ωstandard resistor.R TOTAL = R2 + R1, where R1 = 3.76M Ω.Use a 3.79M Ωstandard resistor.A lower value for total resistance dissipates morepower but provides slightly better accuracy.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 10______________________________________________________________________________________Reverse-Battery ProtectionUse a diode or p-channel MOSF ET to protect the MAX6397/MAX6398 during a reverse-battery insertion (Figures 7a, 7b). Low p-channel MOSFET on-resistance of 30m Ωor less yields a forward-voltage drop of only a few millivolts (versus hundreds of millivolts for a diode,Figure 7a) thus improving efficiency.Connecting a positive battery voltage to the drain of Q1(F igure 7b) produces forward bias in its body diode,which clamps the source voltage one diode drop below the drain voltage. When the source voltage exceeds Q1’s threshold voltage, Q1 turns on. Once the F ET is on, the battery is fully connected to the system and can deliver power to the device and the load.An incorrectly inserted battery reverse-biases the F ET’s body diode. The gate remains at the ground potential.The FET remains off and disconnects the reversed bat-tery from the system. The zener diode and resistor com-bination prevent damage to the p-channel MOSF ET during an overvoltage condition.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________11M A X 6397/M A X 6398REG Capacitor Selection for StabilityFor stable operation over the full temperature range and with load currents up to 100mA, use ceramic capacitor values greater than 4.7µF. Large output capacitors help reduce noise, improve load-transient response, and power-supply rejection at REG. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. At lower temperatures, it may be nec-essary to increase capacitance.Under normal conditions, use a 10µF capacitor at rger input capacitor values and lower ESR provide bet-ter supply-noise rejection and line-transient response.Inrush/Slew-Rate ControlInrush current control can be implemented by placing a capacitor at GATE (F igure 8) to slowly ramp up the GATE, thus limiting the inrush current and controlling GATE’s slew rate during initial turn-on. The inrush cur-rent can be approximated using the following formula:where I GATE is GATE’s 75µA sourcing current, I LOAD is the load current at startup, and C OUT is the output capacitor.Input Transients ClampingWhen the external MOSFET is turned off during an over-voltage occurrence, stray inductance in the power path may cause voltage ringing exceeding the MAX6397/MAX6398 absolute maximum input (IN) supply rating.The following techniques are recommended to reduce the effect of transients:•Minimize stray inductance in the power path usingwide traces, and minimize loop area including the power traces and the return ground path.•Add a zener diode or transient voltage suppressor(TVS) rated below the IN absolute maximum rating (Figure 9).Add a resistor in series with IN to limit transient currentgoing into the input for the MAX6398 only.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 12______________________________________________________________________________________Figure 8. MAX6397/MAX6398 Controlling GATE Inrush CurrentFigure 9. Protecting the MAX6397/MAX6398 Input from High-Voltage TransientsMOSFET SelectionSelect external MOSF ETs according to the application current level. The MOSF ET’s on-resistance (R DS(ON))should be chosen low enough to have minimum voltage drop at full load to limit the MOSFET power dissipation.Determine the device power rating to accommodate an overvoltage fault when operating the MAX6397/MAX6398 in overvoltage limit mode.During normal operation, the external MOSFETs dissipate little power. The power dissipated in normal operation is:P Q1 = I LOAD 2x R DS(ON).The most power dissipation will occur during a pro-longed overvoltage event when operating the MAX6397/MAX6398 in voltage limiter mode, resulting in high power dissipated in Q1 (F igure 10) where the power dissipated across Q1 is:P Q1= V Q1x I LOADwhere V Q1is the voltage across the MOSF ET’s drain and source.Thermal ShutdownThe MAX6397/MAX6398 thermal-shutdown feature shuts off the linear regulator output, REG, and GATE if it exceeds the maximum allowable thermal dissipation.Thermal shutdown also monitors the PC board tempera-ture of the external nF ET when the devices sit on thesame thermal island. Good thermal contact between the MAX6397/MAX6398 and the external nF ET is essential for the thermal-shutdown feature to operate effectively.Place the nFET as close as possible to OUT.When the junction temperature exceeds T J = +150°C,the thermal sensor signals the shutdown logic, turning off REG’s internal pass transistor and the GATE output,allowing the device to cool. The thermal sensor turns the pass transistor and GATE on again after the IC’s junction temperature cools by 20°C. Thermal-overload protection is designed to protect the MAX6397/MAX6398 and the external MOSFET in the event of cur-rent-limit fault conditions. For continuous operation, do not exceed the absolute maximum junction-tempera-ture rating of T J = +150°C.Thermal ShutdownOvervoltage Limiter ModeWhen operating the MAX6397/MAX6398 in overvoltage limit mode for a prolonged period of time, a thermal shutdown is possible due to device self-heating. The thermal shutdown is dependent on a number of differ-ent factors:•The device’s ambient temperature (T A )•The output capacitor (C OUT )•The output load current (I OUT )•The overvoltage threshold limit (V OV )•The overvoltage waveform period (t OVP )•The power dissipated across the package (P DISS )MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________13M A X 6397/M A X 6398When OUT exceeds the adjusted overvoltage threshold,an internal GATE pulldown current is enabled until OUT drops by 5%. The capacitance at OUT is discharged by the internal current sink and the external OUT load cur-rent. The discharge time (∆t1) is approximately:where V OV is the adjusted overvoltage threshold, I OUT is the external load current and I GATEPD is the GATE’s internal 100mA (typ) pulldown current.When OUT falls 5% below the overvoltage threshold point, the internal current sink is disabled and the MAX6397/MAX6398’s internal charge pump begins recharging the external GATE voltage. The OUT volt-age continues to drop due to the external OUT load current until the MOSF ET gate is recharged. The time needed to recharge GATE and re-enhance the external nFET is approximately:where C ISS is the MOSFET’s input capacitance, V GS(TH)is the MOSFET’s gate-to-source threshold voltage, V F is the internal clamp diode forward voltage (V F = 1.5V typ),and I GATE is the MAX6397/MAX6398 charge-pump cur-rent (75µA typ).During ∆t2, C OUT loses charge through the output load.The voltage across C OUT (∆V2) decreases until the MOSF ET reaches its V GS(TH) threshold and can be approximated using the following formula:Once the MOSFET V GS (TH ) is obtained, the slope of the output voltage rise is determined by the MOSF ET Q G charge through the internal charge pump with respect to the drain potential. The time for the OUT voltage to rise again to the overvoltage threshold can be approxi-mated using the following formula:where ∆V OUT = ( V OV x 0.05) + ∆V2.The total period of the overvoltage waveform can be summed up as follows:t OVP = ∆t1 + ∆t2 + ∆t3The MAX6397/MAX6398 dissipate the most power dur-ing an overvoltage event when I OUT = 0 (C OUT is dis-charged only by the internal current sink). The maximum power dissipation can be approximated using the follow-ing equation:The die temperature (T J ) increase is related to θJC (8.3°C/W and 8.5°C/W for the MAX6397 and MAX6398,respectively) of the package when mounted correctly with a strong thermal contact to the circuit board. The MAX6397/MAX6398 thermal shutdown is governed by the equation:T J = T A + P DISS x (θJC + θCA) < 170°C (typical thermal-shutdown temperature)For the MAX6397, the power dissipation of the internal linear regulator must be added to the overvoltage pro-tection circuit power dissipation to calculate the die temperature. The linear regulator power dissipation is calculated using the following equation:P REG = (V IN – V REG ) (I REG )F or example, using an IRF R3410 100V n-channel MOSF ET, F igure 12 illustrates the junction temperature vs. output capacitor with I OUT = 0, T A = +125°C, V OV < 16V,V F = 1.5V, I GATE = 75mA, and I GATEPD =100mA. Figure 12 shows the relationship between output capacitance versus die temperature for the conditionslisted above.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 14______________________________________________________________________________________。

MAX465中文资料

Devices offered in this series are as follows:
PART
DESCRIPΒιβλιοθήκη IONMAX463 MAX464 MAX465 MAX466 MAX467 MAX468 MAX469 MAX470
Triple RGB Switch & Buffer Quad RGB Switch & Buffer Triple RGB Switch & Buffer Quad RGB Switch & Buffer Triple Video Buffer Quad Video Buffer Triple Video Buffer Quad Video Buffer
Continuous Power Dissipation (TA = +70°C) 16-Pin Plastic DIP (derate 22.22mW/°C above +70°C) ....1778mW 16-Pin Wide SO (derate 20.00mW/°C above +70°C) .......1600mW
The MAX463–MAX470 series of two-channel, triple/quad buffered video switches and video buffers combines high-accuracy, unity-gain-stable amplifiers with high-performance video switches. Fast switching time and low differential gain and phase error make this series of switches and buffers ideal for all video applications. The devices are all specified for ±5V supply operation with inputs and outputs as high as ±2.5V when driving 150Ω loads (75Ω back-terminated cable).

MEMORY存储芯片MT29F256G08CJAAAWP中文规格书

Programmable Preamble Modes and DQS PostamblesThe device supports programmable WRITE and READ preamble modes, either the nor-mal 1t CK preamble mode or special 2t CK preamble mode. The 2t CK preamble mode places special timing constraints on many operational features as well as being suppor-ted for data rates of DDR4-2400 and faster. The WRITE preamble 1t CK or 2t CK mode can be selected independently from READ preamble 1t CK or 2t CK mode.READ preamble training is also supported; this mode can be used by the DRAM con-troller to train or "read level" the DQS receivers.There are t CCD restrictions under some circumstances:•When 2t CK READ preamble mode is enabled, a t CCD_S or t CCD_L of 5 clocks is not allowed.•When 2t CK WRITE preamble mode is enabled and write CRC is not enabled, a t CCD_S or t CCD_L of 5 clocks is not allowed.•When 2t CK WRITE preamble mode is enabled and write CRC is enabled, a t CCD_S or t CCD_L of 6 clocks is not allowed.WRITE Preamble ModeMR4[12] = 0 selects 1t CK WRITE preamble mode while MR4[12] = 1 selects 2t CK WRITE preamble mode. Examples are shown in the figures below.Figure 111: 1t CK vs. 2t CK WRITE Preamble Mode2t CK Mode1t CK Mode8Gb: x4, x8, x16 DDR4 SDRAM Programmable Preamble Modes and DQS PostamblesLogic Equations for a x8 DeviceDQ0 = MT0DQ5 = MT5DQ1 = MT1DQ6 = MT6DQ2 = MT2DQ7 = MT7DQ3 = MT3DQS_t = MT8DQ4 = MT4DQS_c = MT9Logic Equations for a x16 DeviceDQ0 = MT0DQ10 = INV DQ2DQ1 = MT1DQ11 = INV DQ3DQ2 = MT2DQ12 = INV DQ4DQ3 = MT3DQ13 = INV DQ5DQ4 = MT4DQ14 = INV DQ6DQ5 = MT5DQ15 = INV DQ7DQ6 = MT6LDQS_t = MT8DQ7 = MT7LDQS_c = MT9DQ8 = INV DQ0UDQS_t = INV LDQS_t DQ9 = INV DQ1UDQS_c = INV LDQS_cCT Input Timing RequirementsPrior to the assertion of the TEN pin, all voltage supplies, including V REFCA , must be val-id and stable and RESET_n registered high prior to entering CT mode. Upon the asser-tion of the TEN pin HIGH with RESET_n, CKE, and CS_n held HIGH; CLK_t, CLK_c, and CKE signals become test inputs within t CTECT_Valid. The remaining CT inputs become valid t CT_Enable after TEN goes HIGH when CS_n allows input to begin sampling, pro-vided inputs were valid for at least t CT_Valid. While in CT mode, refresh activities in the memory arrays are not allowed; they are initiated either externally (auto refresh) or in-ternally (self refresh).The TEN pin may be asserted after the DRAM has completed power-on. After the DRAM is initialized and V REFDQ is calibrated, CT mode may no longer be used. The TEN pin may be de-asserted at any time in CT mode. Upon exiting CT mode, the states and the integrity of the original content of the memory array are unknown. A full reset of the memory device is required.After CT mode has been entered, the output signals will be stable within t CT_Valid after the test inputs have been applied as long as TEN is maintained HIGH and CS_n is main-tained LOW.8Gb: x4, x8, x16 DDR4 SDRAM Connectivity Test ModeFigure 95: Power-Down Entry After Read and Read with Auto PrechargeCK_tCK_cCommand DQ BL8DQ BC4DQS_t, DQS_cAddress CKE Transitioning Data Don’t Care Time BreakNote: 1.DI n (or b) = data-in from column n (or b).Figure 96: Power-Down Entry After Write and Write with Auto PrechargeentryTransitioning Data 'RQ¶W &DUH7LPH %UHDN Notes: 1.DI n (or b) = data-in from column n (or b).2.Valid commands at T0 are ACT, DES, or PRE with one bank remaining open after comple-tion of the PRECHARGE command.。

MAX832CWE中文资料

STEP-DOWN CONVER________________________________________________________________ Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
元器件交易网
5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators MAX830–MAX833
ABSOLUTE MAXIMUM RATINGS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Switch Voltage with Respect to Input Voltage. . . . . . . . . . . . . . . . 50V Switch Voltage with Respect to GND (VSW negative) (Note 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V FB/SENSE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +10V SHUT Voltage (not to exceed VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Note 1: Do not exceed switch-to-input voltage limitation.

MAX6356RVUT中文资料

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
元器件交易网
Dual/Triple-Voltage µP Supervisory Circuits MAX6351–MAX6360
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2 to GND .................................................-0.3V to +6V RST (MAX6352/MAX6355/MAX6358)...................... -0.3V to +6V RST, MR, WDI, RST1, RSTIN (MAX6351/MAX6353/ MAX6356/MAX6359) ..............................-0.3V to (VCC1 + 0.3V) RST, RST2 (MAX6351/MAX6354/ MAX6357/MAX6360) ..............................-0.3V to (VCC2 + 0.3V) Input/Output Current, All Pins .............................................20mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range .............................-65°C to +150°C

MAX809SN293D2T1G资料

MAX809 Series,MAX810 SeriesVery Low Supply Current3−Pin MicroprocessorReset MonitorsThe MAX809 and MAX810 are cost−effective system supervisor circuits designed to monitor V CC in digital systems and provide a reset signal to the host processor when necessary. No external components are required.The reset output is driven active within 10 m sec of V CC falling through the reset voltage threshold. Reset is maintained active for a timeout period which is trimmed by the factory after V CC rises above the reset threshold. The MAX810 has an active−high RESET output while the MAX809 has an active−low RESET output. Both devices are available in SOT−23 and SC−70 packages.The MAX809/810 are optimized to reject fast transient glitches on the V CC line. Low supply current of 0.5 m A (V CC= 3.2 V) makes these devices suitable for battery powered applications.Features•Precision V CC Monitor for 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies•Precision Monitoring V oltages from 1.2 V to 4.9 V Availablein 100 mV Steps•Four Guaranteed Minimum Power−On Reset Pulse Width Available (1 ms, 20 ms, 100 ms, and 140 ms)•RESET Output Guaranteed to V CC = 1.0 V.•Low Supply Current•Compatible with Hot Plug Applications•V CC Transient Immunity•No External Components•Wide Operating Temperature: −40°C to 105°C•Pb−Free Packages are AvailableTypical Applications•Computers•Embedded Systems•Battery Powered Equipment•Critical Microprocessor Power Supply MonitoringV CCFigure 1. Typical Application DiagramSee general marking information in the device marking section on page 8 of this data sheet.DEVICE MARKING INFORMATIONSee detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.ORDERING INFORMATIONPIN DESCRIPTIONPin No.Symbol Description1GND Ground2RESET (MAX809)RESET output remains low while V CC is below the reset voltage threshold, and for a reset timeoutperiod after V CC rises above reset threshold2RESET (MAX810)RESET output remains high while V CC is below the reset voltage threshold, and for a reset timeoutperiod after V CC rises above reset threshold3V CC Supply Voltage (Typ)ABSOLUTE MAXIMUM RATINGSRating Symbol Value Unit Power Supply Voltage (V CC to GND)V CC−0.3 to 6.0V RESET Output Voltage (CMOS)−0.3 to (V CC + 0.3)V Input Current, V CC20mA Output Current, RESET20mAdV/dt (V CC)100V/m secThermal Resistance, Junction−to−Air (Note 1)SOT−23SC−70R q JA301314°C/WOperating Junction Temperature Range T J−40 to +105°C Storage Temperature Range T stg−65 to +150°C Lead Temperature (Soldering, 10 Seconds)T sol+260°C ESD ProtectionHuman Body Model (HBM): Following Specification JESD22−A114 Machine Model (MM): Following Specification JESD22−A1152000200VLatchup Current Maximum Rating: Following Specification JESD78 Class IIPositiveNegative I Latchup200200mAStresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.1.This based on a 35x35x1.6mm FR4 PCB with 10mm2 of 1 oz copper traces under natural convention conditions and a single componentcharacterization.2.The maximum package power dissipation limit must not be exceeded.P D+T J(max)*T Aq JAwith T J(max) = 150°CELECTRICAL CHARACTERISTICS T A = −40°C to +105°C unless otherwise noted. Typical values are at T A = +25°C. (Note 3) Characteristic Symbol Min Typ Max Unit V CC RangeT A = 0°C to +70°CT A = −40°C to +105°C 1.01.2−−5.55.5VSupply CurrentV CC = 3.3 VT A = −40°C to +85°CT A = 85°C to +105°C V CC = 5.5 VT A = −40°C to +85°CT A = 85°C to +105°C I CC−−−−0.5−0.8−1.22.01.82.5m AReset Threshold (V in Decreasing) (Note 4)V TH V MAX809SN490T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 4.834.784.664.9−−4.975.025.14MAX8xxLTR, MAX8xxSQ463T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 4.564.504.404.63−−4.704.754.86MAX809HTRT A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 4.484.434.324.55 4.624.674.78MAX8xxMTR, MAX8xxSQ438T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 4.314.274.164.38 4.454.494.60MAX809JTR, MAX8xxSQ400T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 3.943.903.804.00−−4.064.104.20MAX8xxTTR, MAX809SQ308T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 3.043.002.923.08−−3.113.163.24MAX8xxSTR, MAX8xxSQ293T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 2.892.852.782.93−−2.963.003.08MAX8xxRTR, MAX8xxSQ263T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 2.592.562.492.63−−2.662.702.77MAX809SN232, MAX809SQ232T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 2.282.252.212.32−−2.352.382.45MAX809SN160T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 1.581.561.521.60−−1.621.641.68MAX809SN120, MAX8xxSQ120T A = +25°CT A = −40°C to +85°C T A = +85°C to +105°C 1.181.171.141.20−−1.221.231.263.Production testing done at T A = 25°C, over temperature limits guaranteed by design.4.Contact your ON Semiconductor sales representative for other threshold voltage options.ELECTRICAL CHARACTERISTICS(continued) T A = −40°C to +105°C unless otherwise noted. Typical values are atT A = +25°C. (Note 5)Characteristic Symbol Min Typ Max Unit Detector Voltage Threshold Temperature Coefficient−30−ppm/°C V CC to Reset Delay V CC = V TH to (V TH − 100 mV)−10−m secReset Active TimeOut Period (Note 6) MAX8xxSN(Q)293D1MAX8xxSN(Q)293D2MAX8xxSN(Q)293D3MAX8xxSN(Q)293t RP1.020100140−−−−3.366330460msecRESET Output Voltage Low (No Load) (MAX809)V CC = V TH − 0.2 V1.6 V v V TH v2.0 V, I SINK = 0.5 mA2.1 V v V TH v 4.0 V, I SINK = 1.2 mA4.1 V v V TH v 4.9 V, I SINK = 3.2 mAV OL−−0.3VRESET Output Voltage High (No Load) (MAX809)V CC = V TH + 0.2 V1.6 V v V TH v2.4 V, I SOURCE = 200 m A2.5 V v V TH v 4.9 V, I SOURCE = 500 m AV OH0.8 V CC−−VRESET Output Voltage High (No Load) (MAX810)V CC = V TH + 0.2 V1.6 V v V TH v2.4 V, I SOURCE = 200 m A2.5 V v V TH v 4.9 V, I SOURCE = 500 m AV OH0.8 V CC−−VRESET Output Voltage Low (No Load) (MAX810)V CC = V TH − 0.2 V1.6 V v V TH v2.0 V, I SINK = 0.5 mA2.1 V v V TH v 4.0 V, I SINK = 1.2 mA4.1 V v V TH v 4.9 V, I SINK = 3.2 mAV OL−−0.3V5.Production testing done at T A = 25°C, over temperature limits guaranteed by design.6.Contact your ON Semiconductor sales representative for timeout options availability for other threshold voltage options.TYPICAL OPERATING CHARACTERISTICS0.50.40.30.20.10S U P P L Y C U R R E N T (m A )0.60.250.150.0500.35S U P P L Y C U R R E N T (m A )−50−2502550TEMPERATURE (°C)S U P P L Y C U R R E N T (m A )75100−50−2502550TEMPERATURE (°C)100Figure 6. Supply Current vs. Temperature(No Load, MAX809)Figure 7. Supply Current vs. Temperature (NoLoad, MAX810)750.100.200.30TYPICAL OPERATING CHARACTERISTICS252015105.00−50−25255075TEMPERATURE (°C)O U T P U T V O L T A G E V C C (m V )30100250−50−252575125TEMPERATURE (°C)125P O W E R −D O W N R E S E T D E L A Y (m s e c )125−50−2502550TEMPERATURE (°C)N O R M A L I Z E D P O W E R −U P R E S E T T I M E O U T0.70.80.91.21.375100Figure 10. Power−Down Reset Delay vs.Temperature and Overdrive (V TH = 1.2 V)Figure 11. Power−Down Reset Delay vs.Temperature and Overdrive (V TH = 4.9 V)Figure 12. Normalized Power−Up Reset vs.Temperature10050751.01.110050APPLICATIONS INFORMATIONV CC Transient RejectionThe MAX809 provides accurate V CC monitoring and reset timing during power−up, power−down, and brownout/sag conditions, and rejects negative−going transients (glitches) on the power supply line. Figure 13shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive which lies under the curve will not generate a reset signal. Combinations above the curve are detected as a brownout or power−down.Typically, transient that goes 100 mV below the reset threshold and lasts 5.0 m s or less will not cause a reset pulse.Transient immunity can be improved by adding a capacitor in close proximity to the V CC pin of the MAX809.Figure 13. Maximum Transient Duration vs.Overdrive for Glitch Rejection at 25°CV CC1011060M A X I M U M T R A N S I E N T D U R A T I O N (m s e c )RESET COMPARATOR OVERDRIVE (mV)410160210260310360RESET Signal Integrity During Power−DownThe MAX809 RESET output is valid to V CC = 1.0 V .Below this voltage the output becomes an “open circuit” and does not sink current. This means CMOS logic inputs to the Microprocessor will be floating at an undetermined voltage.Most digital systems are completely shutdown well above this voltage. However, in situations where RESET must bemaintained valid to V CC = 0 V , a pull−down resistor must be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 14). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 k W will be suitable for most applications).Figure 14. Ensuring RESET Valid to V CC = 0 VProcessors With Bidirectional I/O PinsSome Microprocessor’s have bidirectional reset pins.Depending on the current drive capability of the processor pin, an indeterminate logic level may result if there is a logic conflict. This can be avoided by adding a 4.7 k W resistor in series with the output of the MAX809 (Figure 15). If there are other components in the system which require a reset signal, they should be buffered so as not to load the reset line.If the other components are required to follow the reset I/O of the Microprocessor, the buffer should be connected as shown with the solid line.Figure 15. Interfacing to Bidirectional Reset I/OBUFFERED RESETORDERING, MARKING AND THRESHOLD INFORMATIONPart Number V TH*(V)Timeout*(ms)Description Marking Package Shipping†MAX809SN160T1 1.60140−460Push−Pull RESET SAA SOT23−33000 / Tape & ReelMAX809SN160T1G 1.60140−460SAA SOT23−3(Pb−Free)MAX809SN232T1 2.32140−460SQP SOT23−3MAX809SN232T1G 2.32140−460SQP SOT23−3(Pb−Free)MAX809RTR 2.63140−460SPS SOT23−3MAX809RTRG 2.63140−460SPS SOT23−3(Pb−Free)MAX809STR 2.93140−460SPT SOT23−3MAX809STRG 2.93140−460SPT SOT23−3(Pb−Free)MAX809TTR 3.08140−460SPU SOT23−3MAX809TTRG 3.08140−460SPU SOT23−3(Pb−Free)MAX809JTR 4.00140−460SPR SOT23−3MAX809JTRG 4.00140−460SPR SOT23−3(Pb−Free)MAX809MTR 4.38140−460SPV SOT23−3MAX809MTRG 4.38140−460SPV SOT23−3(Pb−Free)MAX809HTR 4.55140−460SBD SOT23−3MAX809HTRG 4.55140−460SBD SOT23−3(Pb−Free)MAX809LTR 4.63140−460SPW SOT23−3MAX809LTRG 4.63140−460SPW SOT23−3(Pb−Free)MAX809SN490T1 4.90140−460SBH SOT23−3MAX809SN490T1G 4.90140−460SBH SOT23−3(Pb−Free)MAX809SN120T1G 1.20140−460SSO SOT23−3(Pb−Free)MAX809SN293D1T1G 2.931−3.3SSP SOT23−3(Pb−Free)MAX809SN293D2T1G 2.9320−66SSQ SOT23−3(Pb−Free)MAX809SN293D3T1G 2.93100−330SSR SOT23−3(Pb−Free)MAX809SQ120T1G 1.20140−460ZD SC70−3(Pb−Free)MAX809SQ232T1G 2.32140−460ZE SC70−3(Pb−Free)MAX809SQ263T1G 2.63140−460ZF SC70−3(Pb−Free)MAX809SQ293T1G 2.93140−460ZG SC70−3(Pb−Free)MAX809SQ308T1G 3.08140−460ZH SC70−3(Pb−Free)MAX809SQ400T1G 4.00140−460SZ SC70−3(Pb−Free)MAX809SQ438T1G 4.38140−460ZI SC70−3(Pb−Free)MAX809SQ463T1G 4.63140−460ZJ SC70−3(Pb−Free)MAX809SQ293D1T1G 2.931−3.3ZK SC70−3(Pb−Free)MAX809SQ293D2T1G 2.9320−66ZL SC70−3(Pb−Free)MAX809SQ293D3T1G 2.93100−330ZM SC70−3(Pb−Free)†For information on tape and reel specifications,including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.*Contact your ON Semiconductor sales representative for other threshold voltage options.ORDERING, MARKING AND THRESHOLD INFORMATIONPart Number V TH*(V)Timeout*(ms)Description Marking Package Shipping†MAX810RTR 2.63140−460Push−Pull RESET SPX SOT23−33000 / Tape & ReelMAX810RTRG 2.63140−460SPX SOT23−3(Pb−Free)MAX810STR 2.93140−460SPY SOT23−3MAX810STRG 2.93140−460SPY SOT23−3(Pb−Free)MAX810TTR 3.08140−460SPZ SOT23−3MAX810TTRG 3.08140−460SPZ SOT23−3(Pb−Free)MAX810MTR 4.38140−460SQA SOT23−3MAX810MTRG 4.38140−460SQA SOT23−3(Pb−Free)MAX810LTR 4.63140−460SQB SOT23−3MAX810LTRG 4.63140−460SQB SOT23−3(Pb−Free)MAX810SN120T1G 1.20140−460SSS SOT23−3(Pb−Free)MAX810SN293D1T1G 2.931−3.3SST SOT23−3(Pb−Free)MAX810SN293D2T1G 2.9320−66SSU SOT23−3(Pb−Free)MAX810SN293D3T1G 2.93100−330SSZ SOT23−3(Pb−Free)MAX810SQ120T1G 1.20140−460ZN SC70−3(Pb−Free)MAX810SQ263T1G 2.63140−460ZO SC70−3(Pb−Free)MAX810SQ293T1G 2.93140−460ZP SC70−3(Pb−Free)MAX810SQ438T1G 4.38140−460ZQ SC70−3(Pb−Free)MAX810SQ463T1G 4.63140−460ZR SC70−3(Pb−Free)MAX810SQ293D1T1G 2.931−3.3ZS SC70−3(Pb−Free)MAX810SQ293D2T1G 2.9320−66ZT SC70−3(Pb−Free)MAX810SQ293D3T1G 2.93100−330ZU SC70−3(Pb−Free)†For information on tape and reel specifications,including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.*Contact your ON Semiconductor sales representative for other threshold voltage options.PACKAGE DIMENSIONSSOT−23 (TO236)CASE 318−08ISSUE AN*For additional information on our Pb−Free strategy and solderingdetails, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.SOLDERING FOOTPRINT*ǒmm inchesǓSCALE 10:1NOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEADTHICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.4.318−01 THRU −07 AND −09 OBSOLETE, NEW STANDARD 318−08.VIEW CDIM A MIN NOM MAX MINMILLIMETERS0.89 1.00 1.110.035INCHES A10.010.060.100.001b 0.370.440.500.015c 0.090.130.180.003D 2.80 2.90 3.040.110E 1.20 1.30 1.400.047e 1.78 1.90 2.040.070L 0.100.200.300.0040.0400.0440.0020.0040.0180.0200.0050.0070.1140.1200.0510.0550.0750.0810.0080.012NOM MAX L1 2.102.40 2.640.0830.0940.104H E0.350.540.690.0140.0210.029MAX809 Series, MAX810 SeriesPACKAGE DIMENSIONSSC−70 (SOT−323)CASE 419−04ISSUE Mǒmm inchesǓSCALE 10:1*For additional information on our Pb−Free strategy and solderingdetails, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.PUBLICATION ORDERING INFORMATION元器件交易网。

MAX6368LKA23+中文资料

General DescriptionThe MAX6365–MAX6368 supervisory circuits simplify power-supply monitoring, battery-backup control func-tions, and memory write protection in microprocessor (µP) systems. The circuits significantly improve the size,accuracy, and reliability of modern systems with an ultra-small integrated solution.These devices perform four basic system functions:1) Provide a µP reset output during V CC supply power-up, power-down, and brownout conditions.2) Internally control V CC to backup-battery switching tomaintain data or low-power operation for CMOS RAM, CMOS µPs, real-time clocks, and other digital logic when the main supply fails.3) Provide memory write protection through internalchip-enable gating during supply or processor faults.4) Include one of the following options: a manual resetinput (MAX6365), a watchdog timer function (MAX6366), a battery-on output (MAX6367), or an auxiliary user-adjustable reset input (MAX6368).The MAX6365–MAX6368 operate from V CC supply volt-ages as low as 1.2V. The factory preset reset threshold voltages range from 2.32V to 4.63V (see the Ordering Information ). In addition, each part is offered in three reset output versions: push-pull active low, open-drain active low, or open-drain active high (see the Selector Guide ). The MAX6365–MAX6368 are available in minia-ture 8-pin SOT23 packages.ApplicationsCritical µP/µC Power Portable/Battery-Monitoring Powered Equipment Fax Machines Set-Top Boxes Industrial Control POS EquipmentComputers/ControllersFeatures♦Low +1.2V Operating Supply Voltage (V CC or V BATT )♦Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages♦On-Board Gating of Chip-Enable Signals, 1.5ns Propagation Delay♦Debounced Manual Reset Input (MAX6365)♦Watchdog Timer, 1.6s Timeout (MAX6366)♦Battery-On Output Indicator (MAX6367)♦Auxiliary User-Adjustable RESET IN (MAX6368)♦Low 10µA Quiescent Supply Current ♦Three Available Output StructuresPush-Pull RESET Open-Drain RESET Open-Drain RESET♦RESET/RESET Valid Down to 1.2V Guaranteed (V CC or V BATT )♦Power-Supply Transient Immunity ♦150ms min Reset Timeout Period ♦Miniature 8-Pin SOT23 PackageMAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating________________________________________________________________Maxim Integrated Products1Pin Configurations19-1658; Rev 3; 12/05For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering Information*These parts offer a choice of reset threshold voltages. From the Reset Threshold Ranges table, insert the desired threshold volt-age code in the blank to complete the part number. SOT parts come in tape-and-reel only and must be ordered in 2500-piece increments. See Device Marking Codes for a complete parts list,including SOT top marks and standard threshold versions. See Selector Guide for a listing of device features.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Typical Operating Circuit appears at end of data sheet.M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable GatingABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V = +2.4V to +5.5V, V = +3.0V, CE IN = V , reset not asserted, T = -40°C to +85°C. Typical values are at T = +25°C,Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Terminal Voltages (with respect to GND)V CC , BATT, OUT.......................................................-0.3V to +6V RESET (open drain), RESET (open drain)................-0.3V to +6V BATT ON, RESET (push-pull), RESET IN,WDI, CE IN, CE OUT...........................-0.3V to (V OUT + 0.3V)MR ..............................................................-0.3V to (V CC + 0.3V)Input CurrentV CC Peak ..............................................................................1A V CC Continuous.............................................................250mA BATT Peak.....................................................................250mA BATT Continuous.............................................................40mAGND...............................................................................75mA Output CurrentOUT...............................Short-Circuit Protected for up to 10s RESET, RESET , BATT ON, CE OUT...............................20mA Continuous Power Dissipation (T A = +70°C)8-Pin SOT23 (derate 8.75mW/°C above +70°C)........700mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature .....................................................+150°C Lead Temperature (soldering, 10s).................................+300°CMAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +2.4V to +5.5V, V BATT = +3.0V, CE IN = V CC , reset not asserted, T A = -40°C to +85°C. Typical values are at T A = +25°C,M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 4_______________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)8109121115141316-400-2020406080SUPPLY CURRENTvs. TEMPERATURE (NO LOAD)TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )0.20.60.40.81.01.2BATTERY SUPPLY CURRENT (BACKUP MODE) vs. TEMPERATURETEMPERATURE (°C)B A T T E R Y S U P P L YC U R R E N T (µA )-402040-200608021437658-40-2020406080BATT-TO-OUT ON-RESISTANCEvs. TEMPERATURETEMPERATURE (°C)B A T T -T O -O U T O N -R E S I S T A NC E (Ω)ELECTRICAL CHARACTERISTICS (continued)(V= +2.4V to +5.5V, V = +3.0V, CE IN = V , reset not asserted, T = -40°C to +85°C. Typical values are at T = +25°C,Note 2:V BATT can be 0 anytime, or V CC can go down to 0 if V BATT is active (except at startup).Note 3:RESET is pulled up to OUT. Specifications apply for OUT = V CC or OUT = BATT.Note 4:The chip-enable resistance is tested with V CC = V TH(MAX)and CE IN = V CC / 2.MAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating_______________________________________________________________________________________5Typical Operating Characteristics (continued)(T A = +25°C, unless otherwise noted.)00.40.20.80.61.21.01.4-4020-20406080V CC TO OUT ON-RESISTANCEvs. TEMPERATURETEMPERATURE (°C)V C C T O O U T O N -R E S I S T A N C E (Ω)190195205200210RESET TIMEOUT PERIOD vs. TEMPERATUREM A X 6365/8-05TEMPERATURE (°C)R E S E T T I M E O U T P E R I O D (m s )-402040-206080301575604513512010590TEMPERATURE (°C)P R O P A G A T I O N D E L A Y (µs )-402040-206080V CC TO RESET PROPAGATION DELAYvs. TEMPERATURE2.03.02.55.04.54.03.5RESET THRESHOLD vs. TEMPERATURETEMPERATURE (°C)T H R E S H O L D (V )-402040-206080110010100010,000MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVERESET THRESHOLD OVERDRIVE V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N (µs )40030035025020005015010003215498761000.5 1.0 1.5 2.0 2.5 3.03.5BATTERY SUPPLY CURRENT vs. SUPPLY VOLTAGEV CC (V)B A T T E R Y S U P P L YC U R R E N T (µA )M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 6_______________________________________________________________________________________1.2341.2351.236MAX6368RESET IN THRESHOLD vs. TEMPERATUREM A X 6365/8 -10TEMPERATURE (°C)V R T H (V )-402040-2060801.01.91.61.32.82.52.2MAX6368RESET IN TO RESET PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (µs )-402040-206080013245C LOAD (pF)P R O P A G A T I O N D E L A Y (n s )10050150200CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCE515102025-40-2020406080TEMPERATURE (°C)C E I N T O C E O U T O N -R E S I S T A N C E (Ω)CE IN TO CE OUT ON-RESISTANCEvs. TEMPERATURE1.01.31.21.11.51.41.91.81.71.62.0-40-2020406080TEMPERATURE (°C)W A T C H D O G T I M E O U T P E R I O D (s )MAX6366WATCHDOG TIMEOUT PERIODvs. TEMPERATURETypical Operating Characteristics (continued)(T A = +25°C, unless otherwise noted.)MAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating_______________________________________________________________________________________7M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 8_______________________________________________________________________________________Detailed DescriptionThe Typical Operating Circuit shows a typical connec-tion for the MAX6365–MAX6368. OUT powers the static random-access memory (SRAM). If V CC is greater than the reset threshold (V TH ), or if V CC is lower than V TH but higher than V BATT , V CC is connected to OUT. If V CC is lower than V TH and V CC is less than V BATT ,BATT is connected to OUT. OUT supplies up to 150mA from V CC . In battery-backup mode, an internal MOSFET connects the backup battery to OUT. The on-resistance of the MOSFET is a function of backup-battery voltage and is shown in the BATT-to-OUT On-Resistance vs.Temperature graph in the T ypical Operating Char-acteristics .Chip-Enable Signal GatingThe MAX6365–MAX6368 provide internal gating of CE signals to prevent erroneous data from being written toCMOS RAM in the event of a power failure. During nor-mal operation, the CE gate is enabled and passes all CE transitions. When reset asserts, this path becomes disabled, preventing erroneous data from corrupting the CMOS RAM. All of these devices use a series trans-mission gate from CE IN to CE OUT. The 2ns propaga-tion delay from CE IN to CE OUT allows the devices to be used with most µPs and high-speed DSPs.During normal operation, CE IN is connected to CE OUT through a low on-resistance transmission gate.This is valid when reset is not asserted. If CE IN is high when reset is asserted, CE OUT remains high regard-less of any subsequent transitions on CE IN during the reset event.If CE IN is low when reset is asserted, CE OUT is held low for 12µs to allow completion of the read/write oper-ation (F igure 1). After the 12µs delay expires, the CEFunctional DiagramMAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating_______________________________________________________________________________________9OUT goes high and stays high regardless of any sub-sequent transitions on CE IN during the reset event.When CE OUT is disconnected from CE IN, CE OUT is actively pulled up to OUT.The propagation delay through the chip-enable circuit-ry depends on both the source impedance of the drive to CE IN and the capacitive loading at CE OUT. The chip-enable propagation delay is production tested from the 50% point of CE IN to the 50% point of CE OUT, using a 50Ωdriver and 50pF load capacitance.Minimize the capacitive load at CE OUT to minimize propagation delay, and use a low-output-impedance driver.Backup-Battery SwitchoverIn a brownout or power failure, it may be necessary to preserve the contents of the RAM. With a backup bat-tery installed at BATT, the MAX6365–MAX6368 auto-matically switch the RAM to backup power when V CC falls. The MAX6367 has a BATT ON output that goes high in battery-backup mode. These devices require two conditions before switching to battery-backup mode:1) V CC must be below the reset threshold.2) V CC must be below V BATT .Table 1 lists the status of the inputs and outputs in bat-tery-backup mode. The devices do not power up if the only voltage source is on BATT. OUT only powers upfrom V CC at startup.Many µP-based products require manual reset capabili-ty, allowing the user or external logic circuitry to initiate a reset. For the MAX6365, a logic low on MR asserts reset.Reset remains asserted while MR is low and for a mini-mum of 150ms (t RP ) after it returns high. MR has an inter-nal 20k Ωpullup resistor to V CC . This input can be driven with TTL/CMOS logic levels or with open-drain/collector outputs. Connect a normally open momentary switch from MR to GND to create a manual reset function; exter-nal debounce circuitry is not required. If MR is driven from long cables or the device is used in a noisy environ-ment, connect a 0.1µF capacitor from MR to GND to pro-vide additional noise immunity.Figure 1. Reset and Chip-Enable TimingM A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 10______________________________________________________________________________________Watchdog Input (MAX6366 Only)The watchdog monitors µP activity through the watch-dog input (WDI). If the µP becomes inactive, reset asserts. To use the watchdog function, connect WDI to a bus line or µP I/O line. A change of state (high to low,low to high, or a minimum 100ns pulse) resets the watchdog timer. If WDI remains high or low for longer than the watchdog timeout period (t WD ), the internal watchdog timer runs out and a reset pulse is triggered for the reset timeout period (t RP ). The internal watchdog timer clears whenever reset asserts or whenever WDI sees a rising or falling edge. If WDI remains in either a high or low state, a reset pulse asserts periodically after every t WD (Figure 2).BATT ON Indicator (MAX6367 Only)BATT ON is a push-pull output that drives high when in battery-backup mode. BATT ON typically sinks 3.2mA at 0.1V saturation voltage. In battery-backup mode, this terminal sources approximately 10µA from OUT. Use BATT ON to indicate battery-switchover status or to supply base drive to an external pass transistor for higher current applications (Figure 3).RESET IN Comparator (MAX6368 Only)RESET IN is compared to an internal 1.235V reference.If the voltage at RESET IN is less than 1.235V, reset asserts. Use the RESET IN comparator as an undervolt-age detector to signal a failing power supply or as a secondary power-supply reset monitor.To program the reset threshold (V RTH ) of the secondary power supply, use the following (see Typical Operating Circuit ):V RTH = V REF (R1 / R2 + 1)where V REF = 1.235V. To simplify the resistor selection,choose a value for R2 and calculate R1:R1 = R2 [(V RTH / V REF ) - 1]Since the input current at RESET IN is 25nA (max),large values (up to 1M Ω) can be used for R2 with no significant loss in accuracy. For example, in the Typical Operating Circuit , the MAX6368 monitors two supply voltages. To monitor the secondary 5V logic or analog supply with a 4.60V nominal programmed reset thresh-old, choose R2 = 100k Ω, and calculate R1 = 273k Ω.Reset OutputA µP’s reset input starts the µP in a known state. The MAX6365–MAX6368 µP supervisory circuits assert a reset to prevent code-execution errors during power-up, power-down, and brownout conditions. RESET is guaranteed to be a logic low or logic high, depending on the device chosen (see the Ordering Information ).RESET or RESET asserts when V CC is below the reset threshold and for at least 150ms (t RP ) after V CC rises above the reset threshold. RESET or RESET also asserts when MR is low (MAX6365) and when RESET IN is less than 1.235V (MAX6368). The MAX6366 watch-dog function will cause RESET (or RESET ) to assert in pulses following a watchdog timeout (Figure 2).Applications InformationOperation Withouta Backup Power SourceThe MAX6365–MAX6368 provide battery-backup func-tions. If a backup power source is not used, connect BATT to GND and OUT to V CC .Watchdog Software ConsiderationsOne way to help the watchdog timer monitor the soft-ware execution more closely is to set and reset the watchdog at different points in the program rather than pulsing the watchdog input periodically. F igure 4shows a flow diagram in which the I/O driving theFigure 2. MAX6366 Watchdog Timeout Period and Reset Active TimeMAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating______________________________________________________________________________________11watchdog is set low in the beginning of the program,set high at the beginning of every subroutine or loop,and set low again when the program returns to the beginning. If the program should hang in any subrou-tine, the problem would be quickly corrected.Replacing the Backup BatteryWhen V CC is above V TH , the backup power source can be removed without danger of triggering a reset pulse.The device does not enter battery-backup mode when V CC stays above the reset threshold voltage.Negative-Going V CC TransientsThese supervisors are relatively immune to short-dura-tion, negative-going V CC transients. Resetting the µP when V CC experiences only small glitches is usually not desirable.The T ypical Operating Characteristics section has a Maximum Transient Duration vs. Reset Threshold Overdrive graph for which reset is not asserted. The graph was produced using negative-going V CC pulses,starting at V CC and ending below the reset threshold by the magnitude indicated (reset threshold overdrive).The graph shows the maximum pulse width that a neg-ative-going V CC transient can typically have without triggering a reset pulse. As the amplitude of the tran-sient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a V CC transient that goes 100mV below the reset threshold and lasts for 30µs will not trig-ger a reset pulse.A 0.1µF bypass capacitor mounted close to the V CC pin provides additional transient immunity.M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 12______________________________________________________________________________________standard versions only. Contact factory for availability of nonstandard versions.MAX6365–MAX6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating______________________________________________________________________________________13Pin Configurations (continued)M A X 6365–M A X 6368SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 14______________________________________________________________________________________Typical Operating CircuitChip InformationTRANSISTOR COUNT: 729PROCESS: CMOSSOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable GatingMAX6365–MAX6368Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. 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 ____________________15©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc.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 /packages .)。

MAX6398ATT-T中文资料

General DescriptionThe MAX6397/MAX6398 are small, high-voltage overvolt-age protection circuits. These devices disconnect the output load or limit the output voltage during an input overvoltage condition. These devices are ideal for appli-cations that must survive high-voltage transients such as those found in automotive and industrial applications.The MAX6397/MAX6398 monitor the input or output voltages and control an external n-channel MOSFET to isolate or limit the load from overvoltage transient energy.When the monitored input voltage is below the user-adjustable overvoltage threshold, the external n-channel MOSFET is turned on by the GATE output. In this mode,the internal charge pump fully enhances the n-channel MOSFET with a 10V gate-to-source voltage.When the input voltage exceeds the overvoltage thresh-old, the protection can disconnect the load from the input by quickly forcing the GATE output low. In some applications, disconnecting the output from the load is not desirable. In these cases, the protection circuit can be configured to act as a voltage limiter where the GATE output sawtooths to limit the voltage to the load.The MAX6397 also offers an always-on linear regulator that is capable of delivering up to 100mA of output current. This high-voltage linear regulator consumes only 37µA of quiescent current.The regulator is offered with output options of 5V, 3.3V,2.5V, or 1.8V. An open-drain, power-good output (POK)asserts when the regulator output falls below 92.5% or 87.5% of its nominal voltage.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions. The devices operate over a wide 5.5V to 72V supply voltage range, are available in small TDFN packages, and are fully specified from -40°C to +125°C.ApplicationsAutomotive Industrial FireWire ®Notebook Computers Wall Cube Power DevicesFeatures♦5.5V to 72V Wide Supply Voltage Range♦Overvoltage Protection Controllers Allow User to Size External n-Channel MOSFETs ♦Internal Charge-Pump Circuit Ensures MOSFET Gate-to-Source Enhancement for Low R DS(ON)Performance ♦Disconnect or Limit Output from Input During Overvoltage Conditions ♦Adjustable Overvoltage Threshold ♦Thermal-Shutdown Protection♦Always-On, Low-Current (37µA) Linear Regulator Sources Up to 100mA (MAX6397)♦Fully Specified from -40°C to +125°C (T J )♦Small, Thermally Enhanced 3mm x 3mm TDFN PackageMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V________________________________________________________________Maxim Integrated Products1Pin ConfigurationsOrdering Information19-3668; Rev 3; 1/07For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Selector Guide and Typical Operating Circuit appear at end of data sheet.FireWire is a registered trademark of Apple Computer, Inc.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V= 14V; C = 6000pF, C = 4.7µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +25°C.)(Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional oper-ation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.(All pins referenced to GND, unless otherwise noted.)IN, GATE, OUT............................................................-0.3V to +80V SHDN ..................................................................-0.3V to (IN + 0.3V)GATE to OUT.................................................................-0.3 to +20V SET, REG, POK...........................................................-0.3V to +12V Maximum Current:IN, REG...............................................................................350mA All Remaining Pins...................................................................50mAContinuous Power Dissipation (T A = +70°C)6-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW 8-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW Operating Temperature Range (T A )......................-40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature Range.................................-65°C to +150°C Lead Temperature................................................................+300°CMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = 14V; C GATE = 6000pF, C REG = 4.7µF, T A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = T J = +25°C.)(Note 1)Note 1:Specifications to -40°C are guaranteed by design and not production tested.Note 2:The MAX6397/MAX6398 power up with the external FET in off mode (V GATE = GND). The external FET turns on t START after thedevice is powered up and all input conditions are valid.Note 3:For accurate overtemperature shutdown performance, place the device in close thermal contact with the external MOSFET.Note 4:Dropout voltage is defined as V IN - V REG when V REG is 2% below the value of V REG for V IN = V REG (nominal) + 2V.Note 5:Operations beyond the thermal dissipation limit may permanently damage the device.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 4_______________________________________________________________________________________Typical Operating Characteristics(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)40608010012014016002010304050607080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )1007525500-259010011012013014015016017018080-50125405060708090100110120020406080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y CU R R E N T (µA )8010090120110130140-502550-25075100125SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L YC U R R E N T (µA )20302540354550040206080SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE (MAX6397)INPUT VOLTAGE (V)S U P P L YC U R R E N T (µA )103050700642810121416182020406080SHUTDOWN SUPPLY CURRENTvs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P PL Y C U R R E N T (µA )0642810124121068141618202224GATE-DRIVE VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)V G A T E - V O U T (V )4.04.64.44.25.04.85.85.65.45.26.0-50-250255075100125UVLO THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 08TEMPERATURE (°C)V U V L O (V )SET THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 09TEMPERATURE (°C)S E T T H R E S H O L D (V )1007525500-251.2041.2081.2121.2161.2201.2241.2281.2321.2361.2401.200-50125MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________516.016.316.216.116.516.416.916.816.716.617.0-50-25255075100125GATE-TO-OUT CLAMP VOLTAGEvs. TEMPERATUREM A X 6397-98 t o c 10TEMPERATURE (°C)G A T E -T O -O U T C L A M P V O L T A G E (V )00.40.20.80.61.21.01.41.81.62.0040608020100120140160180DROPOUT VOLTAGE vs. REG LOAD CURRENTREG LOAD CURRENT (mA)D R O P O U T V O L T A GE (V )4.905.004.955.105.055.155.20-40-10520-253550658095110125REG OUTPUT VOLTAGEvs. LOAD CURRENT AND TEMPERATURETEMPERATURE (°C)R E G O U T P U T V O L T A G E (V )4.04.64.44.24.85.05.21601204080200240280320360400MAXIMUM REG OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURELOAD CURRENT (mA)R E G O U T P U T V O L T A G E (V )POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (Hz)P S R R (d B )1M 100k 10k 1k 100-60-50-40-30-20-100-701010M4ms/divSTARTUP WAVEFORM(R LOAD = 100Ω, C IN = 10µF, C OUT = 10µF)V IN 10V/divMAX6397-98 toc16V GATE 10V/div V OUT 10V/div I OUT200mA/div400µs/divSTARTUP WAVEFORM FROM SHUTDOWN(C IN = 10µF, C OUT = 10µF)V 2V/divV GATE 10V/divV OUT 10V/div I OUT200mA/divR LOAD = 100ΩTypical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)GATE-DRIVE VOLTAGE vs. TEMPERATUREM A X 6397-98 t o c 14TEMPERATURE (°C)G A T E -D R I V E V O L T A G E (V )1007525500-2510.45510.46010.46510.47010.47510.48010.48510.49010.49510.50010.450-50125M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)200µs/divOVERVOLTAGE SWITCH FAULTV IN 20V/divV GATE 20V/div V OUT 20V/div V REG 5V/divV OV = 30V1ms/divVOLTAGE LIMIT FAULTV IN 20V/divV GATE 20V/divV OUT 20V/div V REG 5V/divV OV = 30V400µs/divTRANSIENT RESPONSEV IN 10V/divV REG100mV/divC REG = 10µF I REG = 10mA1ms/divREG LOAD-TRANSIENT RESPONSEV REGAC-COUPLED 500mV/divI REG100mA/divC REG = 10µF1ms/divREGULATOR STARTUP WAVEFORMV IN 10V/divV POK 2V/divV REG 2V/divI REG = 10mA100µs/divREGULATOR POK ASSERTIONV REG 2V/divI REG200mA/div V POK 2V/divI REG = 00V0V0ADetailed Description The MAX6397/MAX6398 are ultra-small, low-current, high-voltage protection circuits for automotive applica-tions that must survive load dump and high-voltage transient conditions. These devices monitor the input/ output voltages and control an external n-channel MOSF ET to isolate the load or to regulate the output voltage from overvoltage transient energy. The con-troller allows system designers to size the external MOSFET to their load current and board size.The MAX6397/MAX6398 drive the MOSF ET’s gate high when the monitored input voltage is below the adjustable overvoltage threshold. An internal charge-pump circuit provides a 5V to 10V gate-to-source drive (see the Typical Operating Characteristics) to ensure low input-to-load voltage drops in normal operating modes. When the input voltage rises above the user-adjusted overvoltage threshold, GATE pulls to OUT, turning off the MOSFET.The MAX6397/MAX6398 are configurable to operate as overvoltage protection switches or as closed-looped volt-age limiters. In overvoltage protection switch mode, theinput voltage is monitored. When an overvoltage condi-tion occurs at IN, GATE pulls low, disconnecting the loadfrom the power source, and then slowly enhances upon removal of the overvoltage condition. In overvoltagelimit mode, the output voltage is monitored and theMAX6397/MAX6398 regulate the source of the external MOSFET at the adjusted overvoltage threshold, allowing devices within the system to continue operating during an overvoltage condition.The MAX6397/MAX6398 undervoltage lockout (UVLO) function disables the devices as long as the input remains below the 5V (typ) UVLO turn-on threshold. TheMAX6397/MAX6398 have an active-low SHDN input toturn off the external MOSFET, disconnecting the load and reducing power consumption. After power is applied and SHDN is driven above its logic-high voltage, there is a100µs delay before GATE enhancement commences.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V _______________________________________________________________________________________7M A X 6397/M A X 6398The MAX6397 integrates a high-input-voltage, low-qui-escent-current linear regulator in addition to an over-voltage protector circuit. The linear regulator remains enabled at all times to power low-current “always-on”applications (independent of the state of the external MOSF ET). The regulator is offered with several stan-dard output voltage options (5V, 3.3V, 2.5V, or 1.8V).An open-drain power-good output notifies the system if the regulator output falls to 92.5% or 87.5% of its nomi-nal voltage. The MAX6397’s REG output operates inde-pendently of the SHDN logic input.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions.Linear Regulator (MAX6397 Only)The MAX6397 is available with 5.0V, 3.3V, 2.5V, and 1.8V factory-set output voltages. Each regulator sources up to 100mA and includes a current limit of 230mA. The linear regulator operates in an always-on condition regardless of the SHDN logic. For fully specified operation, V IN must be greater than 6.5V for the MAX6397L/M (5V regulator output). The actual output current may be limited by the operating condition and package power dissipation.Power-OK OutputPOK is an open-drain output that goes low when REG falls to 92.5% or 87.5% (see the Selector Guide ) of its nominal output voltage. To obtain a logic-level output,connect a pullup resistor from POK to REG or another system voltage. Use a resistor in the 100k Ωrange to minimize current consumption. POK provides a valid logic-output level down to V IN = 1.5V.GATE VoltageThe MAX6397/MAX6398 use a high-efficiency charge pump to generate the GATE voltage. Upon V IN exceed-ing the 5V (typ) UVLO threshold, GATE enhances 10V above IN (for V IN ≥14V) with a 75µA pullup current. An overvoltage condition occurs when the voltage at SET pulls above its 1.215V threshold. When the threshold is crossed, GATE falls to OUT within 100ns with a 100mA (typ) pulldown current. The MAX6397/MAX6398 include an internal clamp to OUT that ensures GATE is limited to 18V (max) above OUT to prevent gate-to-source damage to the external FET.The GATE cycle during overvoltage limit and overvolt-age switch modes are quite similar but have distinct characteristics. In overvoltage switch mode (Figure 2a),GATE is enhanced to V IN + 10V while the monitored IN voltage remains below the overvoltage fault threshold (SET < 1.215V). When an overvoltage fault occurs (SET ≥1.215V), GATE is pulled one diode below OUT, turn-ing off the external F ET and disconnecting the load from the input. GATE remains low (FET off) as long as V IN is above the overvoltage fault threshold. As V IN falls back below the overvoltage fault threshold (-5% hys-teresis) GATE is again enhanced to V IN + 10V.In overvoltage limit mode (Figure 2b), GATE is enhanced to V IN + 10V. While the monitored OUT voltage remains below the overvoltage fault threshold (SET < 1.215V).When an overvoltage fault occurs (SET ≥1.215V),GATE is pulled low one diode drop below OUT until OUT drops 5% below the overvoltage fault threshold.GATE is then turned back on until OUT again reaches the overvoltage fault threshold and GATE is again turned off.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 8_______________________________________________________________________________________GATE cycles on-off-on-off-on in a sawtooth waveform until OUT remains below the overvoltage fault threshold and GATE remains constantly on (V IN + 10V). The over-voltage limiter’s sawtooth GATE output operates the MOSFET in a switched-linear mode while the input volt-age remains above the overvoltage fault threshold. The sawtooth frequency depends on the load capacitance,load current, and MOSFET turn-on time (GATE charge current and GATE capacitance).GATE goes high when the following startup conditions are met: V IN is above the UVLO threshold, SHDN is high, an overvoltage fault is not present and the device is not in thermal shutdown.Overvoltage MonitoringWhen operating in overvoltage mode, the MAX6397/MAX6398 feedback path (F igure 3) consists of IN,SET’s internal comparator, the internal gate charge pump, and the external n-channel MOSFET resulting in a switch-on/off function. When the programmed over-voltage threshold is tripped, the internal fast compara-tor turns off the external MOSFET, pulling GATE to OUT within t OV and disconnecting the power source from the load. When IN decreases below the adjusted over-voltage threshold, the MAX6397/MAX6398 slowly enhance GATE above OUT, reconnecting the load to the power source.Overvoltage LimiterWhen operating in overvoltage limiter mode, the MAX6397/MAX6398 feedback path (F igure 4) consists of OUT, SET’s internal comparator, the internal gate charge pump and the external n-channel MOSF ET,which results in the external MOSF ET operating as a voltage regulator.During normal operation, GATE is enhanced 10V above OUT. The external MOSFET source voltage is monitored through a resistor-divider between OUT and SET. When OUT rises above the adjusted overvoltage threshold, an internal comparator sinks the charge-pump current, dis-charging the external GATE, regulating OUT at the set overvoltage threshold. OUT remains active during the overvoltage transients and the MOSFET continues to con-duct during the overvoltage event, operating in switched-linear mode.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________9V GATE 10V/divV OUT 10V/divV IN 10V/div10ms/divV GATE 10V/divV OUT 10V/divV IN 10V/div4ms/divM A X 6397/M A X 6398As the transient begins decreasing, OUT fall time will depend on the MOSF ET’s GATE charge, the internal charge-pump current, the output load, and the tank capacitor at OUT.For fast-rising transients and very large-sized MOSFETs,add an additional external bypass capacitor from GATE to GND to reduce the effect of the fast-rising voltages at IN. The external capacitor acts as a voltage-divider working against the MOSF ETs’ drain-to-gate capaci-tance. For a 6000pF C gd , a 0.1µF capacitor at GATE will reduce the impact of the fast-rising V IN input.Caution must be exercised when operating the MAX6397/MAX6398 in voltage-limiting mode for long durations. If the V IN is a DC voltage greater than the MOSFET’s maximum gate voltage, the FET will dissipate power continuously. To prevent damage to the external MOSFET, proper heatsinking should be implemented.Applications InformationLoad DumpMost automotive applications run off a multicell, 12V lead-acid battery with a nominal voltage that swings between 9V and 16V (depending on load current,charging status, temperature, battery age, etc.). The battery voltage is distributed throughout the automobile and is locally regulated down to voltages required by the different system modules. Load dump occurs when the alternator is charging the battery and the battery becomes disconnected. Power in the alternator (essen-tially an inductor) flows into the distributed power sys-tem and elevates the voltage seen at each module. The voltage spikes have rise times typically greater than 5ms and decays within several hundred milliseconds but can extend out to 1s or more depending on thecharacteristics of the charging system (F igure 5).These transients are capable of destroying semicon-ductors on the first ‘fault event.’Setting Overvoltage ThresholdsSET provides an accurate means to set the overvoltage level for the MAX6397/MAX6398. Use a resistor-divider to set the desired overvoltage condition (Figure 6). SET has a rising 1.215V threshold with a 5% falling hysteresis.Begin by selecting the total end-to-end resistance,R TOTAL = R1 + R2. Choose R TOTAL to yield a total cur-rent equivalent to a minimum 100 x I SET (SET’s input bias current) at the desired overvoltage threshold.For example:With an overvoltage threshold set to 20V:R TOTAL < 20V/(100 x I SET )where I SET is SET’s 50nA input bias current.R TOTAL < 4M ΩUse the following formula to calculate R2:where V TH is the 1.215V SET rising threshold and V OV is the overvoltage threshold.R2 = 243k Ω, use a 240k Ωstandard resistor.R TOTAL = R2 + R1, where R1 = 3.76M Ω.Use a 3.79M Ωstandard resistor.A lower value for total resistance dissipates morepower but provides slightly better accuracy.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 10______________________________________________________________________________________Reverse-Battery ProtectionUse a diode or p-channel MOSF ET to protect the MAX6397/MAX6398 during a reverse-battery insertion (Figures 7a, 7b). Low p-channel MOSFET on-resistance of 30m Ωor less yields a forward-voltage drop of only a few millivolts (versus hundreds of millivolts for a diode,Figure 7a) thus improving efficiency.Connecting a positive battery voltage to the drain of Q1(F igure 7b) produces forward bias in its body diode,which clamps the source voltage one diode drop below the drain voltage. When the source voltage exceeds Q1’s threshold voltage, Q1 turns on. Once the F ET is on, the battery is fully connected to the system and can deliver power to the device and the load.An incorrectly inserted battery reverse-biases the F ET’s body diode. The gate remains at the ground potential.The FET remains off and disconnects the reversed bat-tery from the system. The zener diode and resistor com-bination prevent damage to the p-channel MOSF ET during an overvoltage condition.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________11M A X 6397/M A X 6398REG Capacitor Selection for StabilityFor stable operation over the full temperature range and with load currents up to 100mA, use ceramic capacitor values greater than 4.7µF. Large output capacitors help reduce noise, improve load-transient response, and power-supply rejection at REG. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. At lower temperatures, it may be nec-essary to increase capacitance.Under normal conditions, use a 10µF capacitor at rger input capacitor values and lower ESR provide bet-ter supply-noise rejection and line-transient response.Inrush/Slew-Rate ControlInrush current control can be implemented by placing a capacitor at GATE (F igure 8) to slowly ramp up the GATE, thus limiting the inrush current and controlling GATE’s slew rate during initial turn-on. The inrush cur-rent can be approximated using the following formula:where I GATE is GATE’s 75µA sourcing current, I LOAD is the load current at startup, and C OUT is the output capacitor.Input Transients ClampingWhen the external MOSFET is turned off during an over-voltage occurrence, stray inductance in the power path may cause voltage ringing exceeding the MAX6397/MAX6398 absolute maximum input (IN) supply rating.The following techniques are recommended to reduce the effect of transients:•Minimize stray inductance in the power path usingwide traces, and minimize loop area including the power traces and the return ground path.•Add a zener diode or transient voltage suppressor(TVS) rated below the IN absolute maximum rating (Figure 9).Add a resistor in series with IN to limit transient currentgoing into the input for the MAX6398 only.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 12______________________________________________________________________________________Figure 8. MAX6397/MAX6398 Controlling GATE Inrush CurrentFigure 9. Protecting the MAX6397/MAX6398 Input from High-Voltage TransientsMOSFET SelectionSelect external MOSF ETs according to the application current level. The MOSF ET’s on-resistance (R DS(ON))should be chosen low enough to have minimum voltage drop at full load to limit the MOSFET power dissipation.Determine the device power rating to accommodate an overvoltage fault when operating the MAX6397/MAX6398 in overvoltage limit mode.During normal operation, the external MOSFETs dissipate little power. The power dissipated in normal operation is:P Q1 = I LOAD 2x R DS(ON).The most power dissipation will occur during a pro-longed overvoltage event when operating the MAX6397/MAX6398 in voltage limiter mode, resulting in high power dissipated in Q1 (F igure 10) where the power dissipated across Q1 is:P Q1= V Q1x I LOADwhere V Q1is the voltage across the MOSF ET’s drain and source.Thermal ShutdownThe MAX6397/MAX6398 thermal-shutdown feature shuts off the linear regulator output, REG, and GATE if it exceeds the maximum allowable thermal dissipation.Thermal shutdown also monitors the PC board tempera-ture of the external nF ET when the devices sit on thesame thermal island. Good thermal contact between the MAX6397/MAX6398 and the external nF ET is essential for the thermal-shutdown feature to operate effectively.Place the nFET as close as possible to OUT.When the junction temperature exceeds T J = +150°C,the thermal sensor signals the shutdown logic, turning off REG’s internal pass transistor and the GATE output,allowing the device to cool. The thermal sensor turns the pass transistor and GATE on again after the IC’s junction temperature cools by 20°C. Thermal-overload protection is designed to protect the MAX6397/MAX6398 and the external MOSFET in the event of cur-rent-limit fault conditions. For continuous operation, do not exceed the absolute maximum junction-tempera-ture rating of T J = +150°C.Thermal ShutdownOvervoltage Limiter ModeWhen operating the MAX6397/MAX6398 in overvoltage limit mode for a prolonged period of time, a thermal shutdown is possible due to device self-heating. The thermal shutdown is dependent on a number of differ-ent factors:•The device’s ambient temperature (T A )•The output capacitor (C OUT )•The output load current (I OUT )•The overvoltage threshold limit (V OV )•The overvoltage waveform period (t OVP )•The power dissipated across the package (P DISS )MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________13M A X 6397/M A X 6398When OUT exceeds the adjusted overvoltage threshold,an internal GATE pulldown current is enabled until OUT drops by 5%. The capacitance at OUT is discharged by the internal current sink and the external OUT load cur-rent. The discharge time (∆t1) is approximately:where V OV is the adjusted overvoltage threshold, I OUT is the external load current and I GATEPD is the GATE’s internal 100mA (typ) pulldown current.When OUT falls 5% below the overvoltage threshold point, the internal current sink is disabled and the MAX6397/MAX6398’s internal charge pump begins recharging the external GATE voltage. The OUT volt-age continues to drop due to the external OUT load current until the MOSF ET gate is recharged. The time needed to recharge GATE and re-enhance the external nFET is approximately:where C ISS is the MOSFET’s input capacitance, V GS(TH)is the MOSFET’s gate-to-source threshold voltage, V F is the internal clamp diode forward voltage (V F = 1.5V typ),and I GATE is the MAX6397/MAX6398 charge-pump cur-rent (75µA typ).During ∆t2, C OUT loses charge through the output load.The voltage across C OUT (∆V2) decreases until the MOSF ET reaches its V GS(TH) threshold and can be approximated using the following formula:Once the MOSFET V GS (TH ) is obtained, the slope of the output voltage rise is determined by the MOSF ET Q G charge through the internal charge pump with respect to the drain potential. The time for the OUT voltage to rise again to the overvoltage threshold can be approxi-mated using the following formula:where ∆V OUT = ( V OV x 0.05) + ∆V2.The total period of the overvoltage waveform can be summed up as follows:t OVP = ∆t1 + ∆t2 + ∆t3The MAX6397/MAX6398 dissipate the most power dur-ing an overvoltage event when I OUT = 0 (C OUT is dis-charged only by the internal current sink). The maximum power dissipation can be approximated using the follow-ing equation:The die temperature (T J ) increase is related to θJC (8.3°C/W and 8.5°C/W for the MAX6397 and MAX6398,respectively) of the package when mounted correctly with a strong thermal contact to the circuit board. The MAX6397/MAX6398 thermal shutdown is governed by the equation:T J = T A + P DISS x (θJC + θCA) < 170°C (typical thermal-shutdown temperature)For the MAX6397, the power dissipation of the internal linear regulator must be added to the overvoltage pro-tection circuit power dissipation to calculate the die temperature. The linear regulator power dissipation is calculated using the following equation:P REG = (V IN – V REG ) (I REG )F or example, using an IRF R3410 100V n-channel MOSF ET, F igure 12 illustrates the junction temperature vs. output capacitor with I OUT = 0, T A = +125°C, V OV < 16V,V F = 1.5V, I GATE = 75mA, and I GATEPD =100mA. Figure 12 shows the relationship between output capacitance versus die temperature for the conditionslisted above.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 14______________________________________________________________________________________。

MAX1978中文数据手册

用于Peltier模块的集成温度控制器概论MAX1978 / MAX1979是用于Peltier热电冷却器（TEC）模块的最小, 最安全, 最精确完整的单芯片温度控制器。

片上功率FET和热控制环路电路可最大限度地减少外部元件, 同时保持高效率。

可选择的500kHz / 1MHz开关频率和独特的纹波消除方案可优化元件尺寸和效率, 同时降低噪声。

内部MOSFET的开关速度经过优化, 可降低噪声和EMI。

超低漂移斩波放大器可保持±0.001°C的温度稳定性。

直接控制输出电流而不是电压, 以消除电流浪涌。

独立的加热和冷却电流和电压限制提供最高水平的TEC保护。

MAX1978采用单电源供电, 通过在两个同步降压调节器的输出之间偏置TEC, 提供双极性±3A输出。

真正的双极性操作控制温度, 在低负载电流下没有“死区”或其他非线性。

当设定点非常接近自然操作点时, 控制系统不会捕获, 其中仅需要少量的加热或冷却。

模拟控制信号精确设置TEC 电流。

MAX1979提供高达6A的单极性输出。

提供斩波稳定的仪表放大器和高精度积分放大器, 以创建比例积分（PI）或比例积分微分（PID）控制器。

仪表放大器可以连接外部NTC或PTC热敏电阻, 热电偶或半导体温度传感器。

提供模拟输出以监控TEC温度和电流。

此外, 单独的过热和欠温输出表明当TEC温度超出范围时。

片上电压基准为热敏电阻桥提供偏置。

MAX1978 / MAX1979采用薄型48引脚薄型QFN-EP 封装, 工作在-40°C至+ 85°C温度范围。

采用外露金属焊盘的耐热增强型QFN-EP封装可最大限度地降低工作结温。

评估套件可用于加速设计。

应用光纤激光模块典型工作电路出现在数据手册的最后。

WDM, DWDM激光二极管温度控制光纤网络设备EDFA光放大器电信光纤接口ATE特征♦尺寸最小, 最安全, 最精确完整的单芯片控制器♦片上功率MOSFET-无外部FET♦电路占用面积<0.93in2♦回路高度<3mm♦温度稳定性为0.001°C♦集成精密积分器和斩波稳定运算放大器♦精确, 独立的加热和冷却电流限制♦通过直接控制TEC电流消除浪涌♦可调节差分TEC电压限制♦低纹波和低噪声设计♦TEC电流监视器♦温度监控器♦过温和欠温警报♦双极性±3A输出电流（MAX1978）♦单极性+ 6A输出电流（MAX1979）订购信息* EP =裸焊盘。

MAX232中文资料(官方版)

新一代器件特性 ____________________________
♦ 对于低电压、集成 ESD 保护的应用 MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E：+3.0V 至 +5.5V、低功耗、速率高达 1Mbps、利用四个 0.1µF 电容实现真正的 RS-232 收发器 (MAX3246E 提供 UCSPTM 封装 )。 ♦ 对于低成本应用 MAX221E：±15kV ESD 保护、+5V、1µA、具有 AutoShutdownTM 功能的单芯片 RS-232。
________________________________ 应用
便携式计算机低功耗调制解调器接口转换电池供电 RS-232 系统多点 RS-232 网络
_____________________________ 定购信息
PART MAX220CPE MAX220CSE MAX220CWE MAX220C/D MAX220EPE MAX220ESE MAX220EWE MAX220EJE MAX220MJE TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 Wide SO Dice* 16 Plastic DIP 16 Narrow SO 16 Wide SO 16 CERDIP 16 CERDIP

MAX306中文资料

_______________General DescriptionThe MAX306/MAX307 precision, monolithic, CMOS analog multiplexers (muxes) offer low on-resistance (less than 100Ω), which is matched to within 5Ωbetween channels and remains flat over the specified analog signal range (7Ωmax). They also offer low leak-age over temperature (I NO(OFF)less than 2.5nA at +85°C) and fast switching speeds (t TRANS less than 250ns). The MAX306 is a single-ended 1-of-16 device,and the MAX307 is a differential 2-of-8 device.The MAX306/MAX307 are fabricated with Maxim’s improved 44V silicon-gate process. Design improve-ments yield extremely low charge injection (less than 10pC) and guarantee electrostatic discharge (ESD)protection greater than 2000V.These muxes operate with a single +4.5V to +30V sup-ply, or bipolar ±4.5V to ±20V supplies, while retaining TTL/CMOS-logic input compatibility and fast switching.CMOS inputs provide reduced input loading. These improved parts are plug-in upgrades for the industry-standard DG406, DG407, DG506A, and DG507A.________________________ApplicationsSample-and-Hold Circuits Test Equipment Heads-Up DisplaysGuidance and Control Systems Military RadiosCommunications Systems Battery-Operated Systems PBX, PABXAudio Signal Routing____________________________Featureso Guaranteed On-Resistance Match Between Channels, <5ΩMaxo Low On-Resistance, <100ΩMaxo Guaranteed Flat On-Resistance over Specified Signal Range, 7ΩMaxo Guaranteed Charge Injection, <10pC o I NO(OFF)Leakage <2.5nA at +85°C o I COM(OFF)Leakage <20nA at +85°C o ESD Protection >2000Vo Plug-In Upgrade for Industry-Standard DG406/DG407/DG506A/DG507Ao Single-Supply Operation (+4.5V to +30V)Bipolar-Supply Operation (±4.5V to ±20V)o Low Power Consumption, <1.25mW o Rail-to-Rail Signal Handling o TTL/CMOS-Logic CompatibleMAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers________________________________________________________________Maxim Integrated Products 1_____________________Pin Configurations/Functional Diagrams/Truth TablesCall toll free 1-800-998-8800 for free samples or literature.19-0270; Rev 0; 8/94Ordering Information continued at end of data sheet.* Contact factory for dice specifications.M A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +15V, V- = -15V, GND = 0V, V AH = +2.4V, V AL = +0.8V, T A = T MIN to T MAX , unless otherwise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltage Referenced to V-V+............................................................................-0.3V, 44V GND.........................................................................-0.3V, 25V Digital Inputs, NO, COM (Note 1)...........(V- - 2V) to (V+ + 2V) or30mA (whichever occurs first)Continuous Current (any terminal)......................................30mA Peak Current, NO or COM(pulsed at 1ms, 10% duty cycle max)..........................100mA Continuous Power Dissipation (T A = +70°C)Plastic DIP (derate 9.09mW/°C above +70°C)............727mW Wide SO (derate 12.50mW/°C above +70°C)............1000mW PLCC (derate 10.53mW/°C above +70°C)..................842mW CERDIP (derate 16.67mW/°C above +70°C).............1333mW Operating Temperature RangesMAX30_C_ _.......................................................0°C to +70°C MAX30_E_ _.....................................................-40°C to +85°C MAX30_MJI....................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CNote 1:Signals on NO, COM, A0, A1, A2, A3, or EN exceeding V+ or V- are clamped by internal diodes. Limit forward current to maximum current ratings.MAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)(V+ = +15V, V- = -15V, GND = 0V, V= +2.4V, V = +0.8V, T = T to T , unless otherwise noted.)M A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—Single Supply(V+ = +12V, V- = 0V, GND = 0V, V AH = +2.4V, V AL = +0.8V, T A = T MIN to T MAX , unless otherwise noted.)Note 2:The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used inthis data sheet.Note 3:Guaranteed by design.Note 4:∆R ON = R ON(MAX)- R ON(MIN).On-resistance match between channels and flatness are guaranteed only with specifiedvoltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured at the extremes of the specified analog signal range.Note 5:Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.Note 6:Off isolation = 20log V COM /V NO , where V COM = output and V NO = input to off switch.MAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers_______________________________________________________________________________________5120140160ON-RESISTANCE vs. V COM(DUAL SUPPLIES)1000204060-2020-1515-1010-5580V COM (V)R O N (Ω)120ON-RESISTANCE vs. V COM AND TEMPERATURE (DUAL SUPPLIES)1000204060-1515-1010-55080V COM (V)R O N (Ω)280320360400ON-RESISTANCE vs. V COM (SINGLE SUPPLY)24040801201601520105200V COM (V)R O N (Ω)120140160ON-RESISTANCE vs. V COM AND TEMPERATURE (SINGLE SUPPLY)10002040601510580V COM (V)R O N (Ω)30CHARGE INJECTION vs. V COM20-30-20-100-1515-1010-55010V COM (V)Q j (p C )100.0001-55125OFF LEAKAGE vs. TEMPERATURE1TEMPERATURE (°C)O F F L E A K A G E (n A )250.010.001-35-15650.1100100045851055100.0001-55125ON LEAKAGE vs. TEMPERATURE1TEMPERATURE (°C)O N L E A K A G E (n A )250.010.001-35-15650.11001000458510551000.001-55125SUPPLY CURRENT vs. TEMPERATURE10TEMPERATURE (°C)I +, I - (µA )250.10.01-35-1565145851055__________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)__________Applications InformationOperation with Supply VoltagesOther than ±15VUsing supply voltages other than ±15V will reduce the analog signal range. The MAX306/MAX307 switches operate with ±4.5V to ±20V bipolar supplies or with a +4.5V to +30V single supply; connect V- to GND when operating with a single supply. Also, both device types can operate with unbalanced supplies such as +24V and -5V. The Typical Operating Characteristics graphs show typical on-resistance with 20V, 15V, 10V, and 5V supplies. (Switching times increase by a factor of two or more for operation at 5V.)Overvoltage ProtectionProper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi-mum ratings because stresses beyond the listed rat-ings may cause permanent damage to the devices.Always sequence V+ on first, then V-, followed by either the logic inputs, NO, or COM. If power-supply sequencing is not possible, add two small signal diodes in series with supply pins for overvoltage pro-tection (Figure 1). Adding diodes reduces the analogsignal range to 1V above V+ and 1V below V-, but low switch resistance and low leakage characteristics are unaffected. Device operation is unchanged, and the difference between V+ and V- should not exceed +44V.M A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers 6_______________________________________________________________________________________Output–bidirectionalCOM28Address Inputs A3–A014–17Enable InputsEN 18Analog Inputs–bidirectional NO1–NO819–26Negative Supply Voltage Input V-27Ground GND 12Analog Inputs–bidirectional NO16–NO94–11MAX306PINNo Internal Connections N.C.2, 3, 13Positive Supply Voltage Input V+1FUNCTIONNAME_____________________________________________________________Pin DescriptionsDiodesMAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers_______________________________________________________________________________________7______________________________________________Test Circuits/Timing DiagramsM A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers 8________________________________________________________________________________________________________________________Test Circuits/Timing Diagrams (continued)Figure 5. Charge InjectionMAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers_______________________________________________________________________________________9_________________________________Test Circuits/Timing Diagrams (continued)Figure 8. NO/COM CapacitanceM A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers 10______________________________________________________________________________________________Pin Configurations/Functional Diagrams/Truth Tables (continued)A2A1A0EN ON Switch X 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1X 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1X 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1None 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16MAX306LOGIC “0” V AL ≤ 0.8V, LOGIC “1” = V AH ≥ 2.4VA3X 0 0 0 0 0 0 0 0 1 1 1 1 1 1 11A2A1A0EN ON Switch X 0 0 0 0 1 1 1 1X 0 0 1 1 0 0 1 1X 0 1 0 1 0 1 0 10 1 1 1 1 1 1 1 1None 1 2 3 4 5 6 7 8MAX307LOGIC “0” V AL ≤ 0.8V, LOGIC “1” = V AH ≥ 2.4VMAX306/MAX307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers______________________________________________________________________________________11________Pin Configurations/Functional Diagrams/Truth Tables (continued)_Ordering Information (continued)* Contact factory for dice specifications.Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.12__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©1994 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.M A X 306/M A X 307Precision, 16-Channel/Dual 8-Channel,High-Performance, CMOS Analog Multiplexers __________________________________________________________Chip TopographiesGNDNO1 NO2 NO3 N04 NO5 NO6 NO7 NO80.184" (4.67mm)0.078" (1.98mm)NO9NO10NO11NO12N013NO14NO15NO16N.C.V-COM V+GND NO1A NO2A NO3A N04A NO5A NO6A NO7A NO8A0.184" (4.67mm)0.078" (1.98mm)NO1B NO2B NO3B NO4B N05B NO6B NO7B NO8B COMBV-COMA V+TRANSISTOR COUNT: 269SUBSTRATE IS INTERNALLY CONNECTED TO V+TRANSISTOR COUNT: 269SUBSTRATE IS INTERNALLY CONNECTED TO V+MAX306MAX307N.C. = NO INTERNAL CONNECTION。

MAX6326XR中文资料

For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.General DescriptionThe MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 microprocessor (µP) supervisory circuits moni-tor the power supplies in µP and digital systems. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.5V, 3V, 3.3V, and 5V powered circuits.These circuits perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold, keeping it asserted for at least 100ms after V CC has risen above the reset threshold.The only difference between the devices is their output.The MAX6326/MAX6346 (push-pull) and MAX6328/MAX6348 (open-drain) have an active-low reset output.The MAX6327/MAX6347 have an active-high push-pull reset output. All of these parts are guaranteed to be in the correct state for V CC down to 1V. The reset compara-tor is designed to ignore fast transients on V CC . Reset thresholds are factory-trimmable between 2.2V and 4.63V, in approximately 100mV increments. Twenty-one standard versions are available. Contact the factory for availability of nonstandard versions.Ultra-low supply currents (1µA max for the MAX6326/MAX6327/MAX6328) make these parts ideal for use in portable equipment. All six devices are available in space-saving SOT23 and SC70 packages.ApplicationsComputers Intelligent Instruments Controllers AutomotiveCritical µP and µC Portable/Battery-Powered Power MonitoringEquipmentFeatureso Ultra-Low 1µA (max) Supply Current (MAX6326/MAX6327/MAX6328)o Precision Monitoring of 2.5V, 3V, 3.3V, and 5V Power-Supply Voltageso Reset Thresholds Available from 2.2V to 4.63V o Fully Specified Over Temperatureo 100ms (min) Power-On Reset Pulse Width o Low Costo Available in Three Versions: Push-Pull RESET ,Push-Pull RESET, and Open-Drain RESET o Power-Supply Transient Immunity o No External Componentso 3-Pin SC70/SOT23 Packageso Pin Compatible with MAX803/MAX809/MAX810MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX63483-Pin, Ultra-Low-Power SC70/SOTµP Reset Circuits________________________________________________________________Maxim Integrated Products 1Pin Configuration19-1294; Rev 3; 1/00†The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 are available in factory-set V CC reset thresholds from 2.2V to 4.63V, in approximately 0.1V increments. Choose the desired reset-threshold suffix from Table 1 and insert it in the blank spaces following “R.”There are 21 standard versions witha required order increment of 2500 pieces. Sample stock is gen-erally held on the standard versions only (see the SelectorGuide). Required order increment is 10,000 pieces for nonstan-dard versions (Table 2). Contact factory for availability. All devices available in tape-and-reel only.Selector Guide appears at end of data sheet.M A X 6326/M A X 6327/M A X 6328/M A X 6346/M A X 6347/M A X 63483-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = full range, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C and V CC = 3V.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Terminal Voltage (with respect to GND)V CC ...........................................................................-0.3V to +6V RESET, RESET (push-pull).........................-0.3V to (V CC + 0.3V)RESET (open drain)..................................................-0.3V to +6V Input Current (V CC ).............................................................20mA Output Current (RESET, RESET ).........................................20mA Rate of Rise (V CC )...........................................................100V/µsContinuous Power Dissipation (T A = +70°C)3-Pin SC70 (derate 2.7mW/°C above +70°C)...............174mW 3-Pin SOT23 (derate 4mW/°C above +70°C)................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CNote 1:Overtemperature limits are guaranteed by design and not production tested.MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX63483-Pin, Ultra-Low-Power SC70/SOTµP Reset Circuits_______________________________________________________________________________________3__________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)00.30.20.10.40.50.60.70.80.91.0-400-2020406080SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE (°C)S U P P L Y C U R R E N T(µA)050100150200-400-2020406080POWER-DOWN RESET DELAY vs. TEMPERATURE TEMPERATURE (°C)R E S E T D E L A Y(µs)130150140160170180190200210-400-2020406080POWER-UP RESET TIMEOUT vs. TEMPERATURE M A X6326-03TEMPERATURE (°C)P O W E R-U P R E S E T T I M E O U T(m s)500011001000MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE (SC70)100300400200M A X6326-04RESET THRESHOLD OVERDRIVE,V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N(µs)10______________________________________________________________Pin DescriptionM A X 6326/M A X 6327/M A X 6328/M A X 6346/M A X 6347/M A X 63483-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits 4___________________________________________________________________________________________________Applications InformationInterfacing to µPs with Bidirectional Reset PinsSince the RESET output on the MAX6328/MAX6348 is open drain, these devices interface easily with micro-processors (µPs) that have bidirectional reset pins,such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcon-troller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 1).Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going V CC transients (glitches).The Typical Operating Characteristics show the Maxi-mum Transient Duration vs. Reset Threshold Overdrive graph, for which reset pulses are not generated. The graph shows the maximum pulse width that a negative-going V CC transient may typically have when issuing a reset signal. As the amplitude of the transient increas-es, the maximum allowable pulse width decreases.Figure 1. Interfacing to µPs with Bidirectional Reset PinsTable 1. Factory-Trimmed Reset Thresholds ‡‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX63483-Pin, Ultra-Low-Power SC70/SOTµP Reset Circuits_______________________________________________________________________________________5Table 1. Factory-Trimmed Reset Thresholds‡(continued)‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.Table 2. Device Marking Codes and Minimum Order IncrementsM A X 6326/M A X 6327/M A X 6328/M A X 6346/M A X 6347/M A X 63483-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits 6__________________________________________________________________________________________________________Chip InformationTRANSISTOR COUNT: 419Table 2. Device Marking Codes and Minimum Order Increments (continued)Selector Guide(standard versions*)*Sample stock is generally held on all standard versions.________________________________________________________Package InformationMAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX63483-Pin, Ultra-Low-Power SC70/SOTµP Reset Circuits_______________________________________________________________________________________7M A X 6326/M A X 6327/M A X 6328/M A X 6346/M A X 6347/M A X 63483-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2000 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information (continued)。

MAX6306UK30D1+中文资料

General DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply. Ideal for monitoring both 5V and 3.3V in personal computer systems, these devices assert a system reset if any of the monitored supplies falls outside the programmed threshold. Low supply current (15µA) and a small package suit them for portable applications. The MAX6305–MAX6313 are specifically designed to ignore fast transients on any monitored supply.These devices are available in a SOT23-5 package,have factory-programmed reset thresholds from 2.5V to 5.0V (in 100mV increments), and feature four power-on reset timeout periods. Ten standard versions are avail-able. Contact the factory for availability of non standard versions.ApplicationsPortable Computers Computers ControllersIntelligent InstrumentsPortable/Battery-Powered Equipment Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V Embedded Control SystemsFeatureso Small 5-Pin SOT23 Packageo Precision Factory-Set V CC Reset Thresholds;Available in 0.1V Increments from 2.5V to 5V o Immune to Short V CC Transientso Guaranteed RESET Valid to V CC = 1V o Guaranteed Over Temperature o 8µA Supply Currento Factory-Set Reset Timeout Delay from 1ms (min) to 1120ms (min)o No External Components o Manual Reset Inputo Under/Overvoltage Supply MonitoringMAX6305–MAX63135-Pin, Multiple-Input,Programmable Reset ICs________________________________________________________________Maxim Integrated Products119-1145; Rev 5; 4/08†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for availability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Pin Configurations and Typical Operating Circuit appear atend of data sheet.Ordering Information continued at end of data sheet.Standard Versions Table appears at end of data sheet._______________________________________________________________Selector TableFor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSV CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC ...........................................................................-0.3V to +6V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input/Output Current, All Pins.............................................20mA Rate of Rise, V CC ............................................................100V/µs Continuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C).................571mWOperating Temperature RangeMAX63_ _UK _ _D_-T.........................................0°C to +70°C MAX63_ _EUK _ _D_-T...................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)V CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/Note 2: The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < V CC < 2.5V.Note 3: The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 monitor V CC through an internal factory-trimmed voltagedivider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately 100mV increments from 2.5V to 5V (Table 1).Note 4:Guaranteed by design.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +5V, T A = +25°C, unless otherwise noted.)5.05.56.06.57.07.58.08.59.09.5-60-40-2020406080100SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )01020304050607080-60-40-2020406080100V CC FALLING PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )010203040506070-60-40-20020406080100OVRST IN RISING PROPAGATION DELAY vs. TEMPERATURE (OVERVOLTAGE RESET INPUT)TEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )020406080100120-60-40-2020406080100RST IN_ FALLING PROPAGATION DELAY vs. TEMPERATURETEMPERATURE (°C)R S T I N _ P R O P A G A T I O N D E L A Y (n s )104001200800MAXIMUM TRANSIENT DURATION vs.VCC RESET THRESHOLD OVERDRIVE10OVERDRIVE, V TH - V CC (mV)T R A N S I E N T D U R A T I O N (μs )100100010,0000.900.920.940.960.981.001.021.041.061.081.10-60-40-20020406080100RESET TIMEOUT vs. TEMPERATURE6305 T O C 05TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T0.9900.9920.9940.9960.9981.0001.0021.0041.0061.0081.010-60-40-2020406080100RESET THRESHOLD vs. TEMPERATURE6305 T O C 06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D (V /V )104001200800MAXIMUM TRANSIENT DURATION vs.OVRST IN THRESHOLD OVERDRIVE10OVERDRIVE, V OVRST IN - V REF (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000104001200800MAXIMUM TRANSIENT DURATION vs.RST IN_ THRESHOLD OVERDRIVE10OVERDRIVE, V REF - V RST IN (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000_______________Detailed DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply and issue a system reset when any monitored supply falls out of regulation. The MAX6305/MAX6308/MAX6311 have two adjustable undervoltage reset inputs (RST IN1 and RST IN2). The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-itor V CC through an internal, factory-trimmed voltage divider. The MAX6306/MAX6309/MAX6312 have, in addition, an adjustable undervoltage reset input and a manual-reset input. The internal voltage divider sets the reset threshold as specified in the device part number (Table 1). The MAX6307/MAX6310/ MAX6313 feature an adjustable undervoltage reset input (RST IN) and an adjustable overvoltage reset input (OVRST IN) in addition to the factory-trimmed reset threshold on the V CC moni-tor. Program the adjustable reset inputs with an external resistor divider (see Adjustable Reset Inputs section).Reset OutputsA µP’s reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions.RESET (MAX6305–MAX6310) and RESET (MAX6311/MAX6312/MAX6313) are guaranteed to be asserted at a valid logic level for V CC > 1V (see Electrical Characteristics ). Once all monitored voltages exceed their programmed reset thresholds, an internal timer keeps reset asserted for the reset timeout period (t RP );after this interval, reset deasserts.If a brownout condition occurs (any or all monitored volt-ages dip outside their programmed reset threshold),reset asserts (RESET goes high; RESET goes low). Any time any of the monitored voltages dip below their reset threshold, the internal timer resets to zero and reset asserts. The internal timer starts when all of the moni-tored voltages return above their reset thresholds, and reset remains asserted for a reset timeout period. The MAX6305/MAX6306/MAX6307 feature an active-low,MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________5______________________________________________________________Pin DescriptionM A X 6305–M A X 6313open-drain, N-channel output. The MAX6308/MAX6309/MAX6310 feature an active-low, complementary output structure that both sinks and sources current, and the MAX6311/MAX6312/MAX6313 have an active-high com-plementary reset output.The MAX6305/MAX6308/MAX6311 switch from under-voltage lockout operation to normal operation between 1.5V < V CC < 2.5V. Below 1.5V, V CC undervoltage-lockout mode asserts RESET . Above 2.5V, V CC normal-operation mode asserts reset if RST IN_ falls below the RST IN_ threshold.Manual-Reset Input(MAX6306/MAX6309/MAX6312)Many µP-based products require manual-reset capability,allowing an operator or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for a reset active timeout period (t RP ) after MR returns high. This input has an inter-nal 63.5k Ωpull-up resistor, so it can be left open if it is not used. MR can be driven with TTL-logic levels in 5V sys-tems, with CMOS-logic levels in 3V systems, or with open-drain/collector output devices. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required.If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.The MR pin has internal ESD-protection circuitry that may be forward biased under certain conditions, drawing excessive current. For example, assume the circuitry driv-ing MR uses a +5V supply other than V CC . If V CC drops or browns out lower than +4.7V, MR ’s absolute maximum rat-ing is violated (-0.3V to (V CC + 0.3V)), and undesirable current flows through the ESD structure from MR to V CC .To avoid this, it is recommended that the supply for the MR pin be the same as the supply monitored by V CC . In this way, the voltage at MR will not exceed V CC .Adjustable Reset InputsThe MAX6305–MAX6313 each have one or more reset inputs (RST IN_ /OVRST IN). These inputs are com-pared to the internal reference voltage (F igure 1).Connect a resistor voltage divider to RST IN_ such that V RST IN_falls below V RSTH (1.23V) when the monitored voltage (V IN ) falls below the desired reset threshold (V TH ) (F igure 2). Calculate the desired reset voltage with the following formula:R1 + R2V TH = ________x VRSTHR25-Pin, Multiple-Input, Programmable Reset ICs 6_______________________________________________________________________________________Figure 1. Functional DiagramMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________7The ±25nA max input leakage current allows resistors on the order of megohms. Choose the pull-up resistor in the divider to minimize the error due to the input leakage cur-rent. The error term in the calculated threshold is simply:±25nA x R1If you choose R1 to be 1M Ω, the resulting error is ±25 x 10-9x 1 x 106= ±25mV.Like the V CC voltage monitors on the MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_inputs (when used with a voltage divider) are designed to ignore fast voltage transients. Increase the noise immunity by connecting a capacitor on the order of 0.1µF between RST IN and GND (Figure 2). This creates a single-pole lowpass filter with a corner frequency given by:f = (1/2π) / (R1 + R2)(R1 x R2 x C)For example, if R1 = 1M Ωand R2 = 1.6M Ω, adding a 0.1µF capacitor from RST IN_ to ground results in a lowpass corner frequency of f = 2.59Hz. Note that adding capacitance to RST IN slows the circuit’s overall response time.__________Applications InformationInterfacing to µPs with Bidirectional Reset PinsSince the RESET output on the MAX6305/MAX6306/MAX6307 is open drain, these devices interface easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcontroller’s RESET pin with a single pull-up resistor allows either device to assert reset (Figure 3).Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going V CC transients (glitches).The Typical Operating Characteristics show the Maximum Transient Duration vs. V CC Reset Threshold Overdrive, for which reset pulses are not generated.The graph was produced using negative-going pulses,starting at V TH max, and ending below the pro-grammed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maxi-mum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e.,goes farther below the reset threshold), the maximum allowable pulse width decreases.RST IN_/OVRST IN are also immune to negative/positive-going transients (see Typical Operating Characteristics ).A 0.1µF bypass capacitor mounted close to the RST IN_,OVRST IN, and/or the V CC pin provides additional tran-sient immunity.Ensuring a Valid RESET /RESETOutput Down to V CC = 0VWhen V CC falls below 1V, push/pull structured RESET /RESET current sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applica-tions, since most µPs and other circuitry do not operate with V CC below 1V. In those applications where RESET must be valid down to 0V, adding a pull-down resistor between RESET and ground sinks any stray leakageFigure 2. Increasing Noise ImmunityFigure 3. Interfacing to µPs with Bidirectional Reset I/Ocurrents, holding RESET low (Figure 4). The pull-down resistor’s value is not critical; 100k Ωis large enough not to load RESET and small enough to pull RESET to ground. For applications where RESET must be valid to V CC , a 100k Ωpull-up resistor between RESET and V CC will hold RESET high when V CC falls below 1V (Figure 5).Since the MAX6305/MAX6306/MAX6307 have open-drain, active-low outputs, they typically use a pull-up resistor. With these devices and under these conditions (V CC < 1V), RESET will most likely not maintain an active condition, but will drift toward a nonactive level due to the pull-up resistor and the RESET output’s reduction in sinking capability. These devices are not recommended for applications that require a valid RESET output below 1V.* Factory-trimmed reset thresholds are available in approximately 100mV increments with a ±1.5% room-temperature variance.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 8_______________________________________________________________________________________Figure 4. Ensuring RESET Valid to V CC = 0VFigure 5. Ensuring RESET Valid to V CC = 0VTable 1. Factory-Trimmed Reset Thresholds*MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________9Chip InformationTRANSISTOR COUNT: 800Typical Operating Circuit†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for avail-ability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 10______________________________________________________________________________________Pin ConfigurationsPackage InformationFor the latest package outline information, go to /packages .Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. 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©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6305–MAX6313 5-Pin, Multiple-Input, Programmable Reset ICs元器件交易网。

MAX6368LKA31中文资料

MAX6366LKA_ _-T MAX6366PKA_ _-T MAX6366HKA_ _-T MAX6367LKA_ _-T
-40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C
8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8
Pin Configurations
TOP VIEW
RESET, RESET 1 CE IN 2 GND 3 MR 4
MAX6365
8 CE OUT 7 BATT 6 OUT 5 VCC
SOT23 Pin Configurations continued at end of data sheet.
Features
BATT Continuous .............................................................40mA
GND ...............................................................................75mA Output Current
Push-Pull RESET Open-Drain RESET Open-Drain RESET ♦ RESET/RESET Valid Down to 1.2V Guaranteed (VCC or VBATT) ♦ Power-Supply Transient Immunity ♦ 150ms min Reset Timeout Period ♦ Miniature 8-Pin SOT23 Package
3) Provide memory write protection through internal chip-enable gating during supply or processor faults.