MAX6387XS26D5中文资料

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MAX809中文资料_数据手册_参数

MAX809R/S/T/Z VCC < 3.6 V; MAX810R/S/T/Z Tamb = –40 °C to +85 °C
MAX809J/L/M MAX810J/L/M
VCC < 5.5 V; Tamb = +85 °C to +105 °C
MAX809R/S/T/Z VCC < 3.6 V; MAX810R/S/T/Z Tamb = +85 °C to +105 °C
2003 Aug 08
4
Philips Semiconductors
3-pin microprocessor resets
Product data
MAX809/MAX810
ELECTRICAL CHARACTERISTICS
VCC = full range (Tamb = –40 °C to +105 °C) unless otherwise noted; typical values are at Tamb = +25 °C, and VCC = 5 V (J/L/M versions), VCC = 3.3 V (T/S versions), VCC = 3 V (R version), and VCC = 2.5 V (Z version) (Note 1).
TEMPERATURE RANGE
–40 to +105 °C –40 to +105 °C –40 to +105 °C –40 to +105 °C
Part number
MAX809
MAX809ZD, MAX809ZW
MAX809RD, MAX809RW

MAX6303中文资料

( ) ARE FOR MAX6302/MAX6304.
* Patents pending
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: , or phone 1-800-998-8800
MAX6301–MAX6304
________________________Applications
Medical Equipment Intelligent Instruments Portable Equipment Battery-Powered Computers/Controllers Embedded Controllers Critical µP Monitoring Set-Top Boxes Computers
ELECTRICAL CHARACTERISTICS
(VCC = +2V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) PARAMETER Operating Voltage Range (Note 1) Supply Current (Note 2) RESET TIMER Reset Input Threshold Voltage Reset Input Hysteresis Reset Input Leakage Current Reset Output Voltage High (MAX6302/MAX6303/MAX6304) VTH VHYST IRESET IN VCC ≥ 4.5V, ISOURCE = 0.8mA VOH VCC = 2V, ISOURCE = 0.4mA MAX6302/MAX6304, VCC = 1.31V, RL = 10kΩ VCC ≥ 4.5V, ISINK = 3.2mA VCC = 2V, ISINK = 1.6mA Reset Output Voltage Low (MAX6301/MAX6303/MAX6304) VOL MAX6301/ MAX6303 VCC = 1V, ISINK = 50µA, TA = 0°C to +70°C VCC = 1.2V, ISINK = 100µA, TA = -40°C to +85°C 63 26 2.8 4.0 5.2 ±1 ±1 VCC - 0.3 0.4 0.4 0.3 0.3 µs µs ms µA V VCC - 0.4 VCC - 0.4 V VRESET IN falling, VCC = 5.0V VRESET IN rising, VCC = 5.0V 1.195 1.220 1.240 20 ±0.01 ±1 1.245 1.265 V mV nA SYMBOL VCC ICC CONDITIONS MAX6301C/MAX6303C MAX6301E/MAX6303E MAX6302/MAX6304 No load MIN 1.00 1.20 1.31 4.0 TYP MAX 5.50 5.50 5.50 7.0 µA V UNITS

W25Q64中文资料精编版

W25Q64BV出版日期：2010年7月8日- 1 - 版本E64M位与串行闪存双路和四路SPIW25Q64BV- 2 -目录1，一般DESCRIPTION (5)2。

FEATURES (5)3引脚配置SOIC208-MIL.......................................... .. (6)4，焊垫配置WSON8X6-MM.......................................... . (6)5，焊垫配置PDIP300-MIL.......................................... . (7)6引脚说明SOIC208密耳，PDIP300密耳和WSON8X6-MM................................ 7......7引脚配置SOIC300mil的.......................................... .. (8)8引脚SOIC封装说明300-MIL (8)8.1包装Types (9)8.2片选(/CS) (9)8.3串行数据输入，输出和IO（DI，DO和IO0，IO1，IO2，IO3）............................. 9.......8.4写保护(/WP) (9)8.5控股(/HOLD) (9)8.6串行时钟(CLK) (9)9座DIAGRAM (10)10功能DESCRIPTION (11)10.1 SPI OPERATIONS (11)10.1.1标准SPI Instructions (11)10.1.2双SPI Instructions (11)10.1.3四路SPI Instructions (11)10.1.4保持功能 (11)10.2写保护 (12)10.2.1写保护Features (12)11，控制和状态寄存器............................................ .. (13)11.1状态REGISTER (13)11.1.1 BUSY (13)11.1.2写使能锁存(WEL) (13)11.1.3块保护位（BP2，BP1，BP0）..................................... .. (13)11.1.4顶/底块保护（TB）....................................... .................................................. ..1311.1.5部门/块保护(SEC) (13)11.1.6状态寄存器保护（SRP，SRP0）....................................... . (14)11.1.7四路启用(QE) (14)11.1.8状态寄存器内存保护........................................... .. (16)11.2 INSTRUCTIONS (17)11.2.1制造商和设备标识........................................... .. (17)11.2.2指令集表1 (18)W25Q64BV11.2.3指令表2（阅读说明书）....................................... (19)出版日期：2010年7月8日- 3 - 修订版E11.2.4写使能(06h) (20)11.2.5写禁止(04h) (20)11.2.6读状态寄存器1（05H）和读状态寄存器2（35H）.............................. (21)11.2.7写状态寄存器（01H）......................................... .................................................. .. (22)11.2.8读取数据(03h) (23)11.2.9快速阅读(0Bh) (24)11.2.10快速读双输出（3BH）........................................ .................................................. 0.25 11.2.11快速读四路输出（6BH）........................................ .. (26)11.2.12快速读双I / O (BBh) (27)11.2.13快速读取四I/ O (EBh) (29)11.2.14八进制字读取四I/ O（E3H）..................................... (31)11.2.15页编程(02h) (33)11.2.16四路输入页编程（32H）........................................ . (34)11.2.17扇区擦除（20H） (35)11.2.1832KB的块擦除（52H） (36)11.2.1964KB的块擦除(D8h) (37)20年2月11日芯片擦除（C7H/ 60h) (38)21年2月11日擦除挂起(75h) (39)22年2月11日擦除恢复(7Ah) (40)23年11月2日掉电(B9h) (41)24年2月11日高性能模式（A3H）......................................... (42)25年2月11日发布掉电或高性能模式/设备ID（ABH） (42)26年2月11日读制造商/设备ID（90H）....................................... . (44)27年2月11日阅读唯一的ID号（4BH）........................................ . (45)28年2月11日读JEDEC的ID (9Fh) (46)29年2月11日连续读取模式复位（FFH或FFFFH）...................................... .. (47)12，电气特性.............................................. (48)12.1绝对最大Ratings (48)12.2操作范围 (48)12.3上电时序和写抑制阈值......................................... (49)12.4直流电气Characteristics (50)12.5 AC测量条件.............................................. .. (51)12.6 AC电气Characteristics (52)12.7 AC电气特性（续）......................................... . (53)12.8串行输出Timing (54)12.9输入Timing (54)12.10持有Timing (54)13包装SPECIFICATION (55)W25Q64BV13.18引脚SOIC208密耳（包装代号SS）..................................... .. (55)- 4 -13.28引脚PDIP300密耳（封装代码DA）..................................... (56)13.38触点WSON8x6毫米（封装代码ZE）....................................... (57)13.416引脚SOIC300密耳（封装代码SF）..................................... . (58)14订货INFORMA TION (59)14.1有效的部件号和顶端标记.......................................... (60)15版本HISTORY (61)W25Q64BV出版日期：2010年7月8日- 5 - 修订版E1概述该W25Q64BV（64M位）串行Flash存储器提供了有限的系统存储解决方案空间，引脚和电源。

MAX2630-MAX2633中文资料

_______________General DescriptionThe MAX2630/MAX2631/MAX2632/MAX2633 are low-voltage, low-noise amplifiers for use from VHF to microwave frequencies. Operating from a single +2.7V to +5.5V supply, these devices have a flat gain response to 900MHz. Their low noise figure and low supply current make them ideal for receive, buffer, and transmit IF applications.The MAX2630/MAX2631 are biased internally, eliminat-ing the need for external bias resistors or inductors. The MAX2632/MAX2633 have a user-selectable supply cur-rent, which can be adjusted by adding a single external resistor. This allows customized output power and gain according to specific applications requirements. The MAX2631/MAX2633 feature a shutdown pin that allows them to be powered down to less than 1µA supply cur-rent. Aside from a single bias resistor required for the MAX2632/MAX2633, the only external components needed for this family of amplifiers are input and output blocking capacitors and a V CC bypass capacitor.The MAX2630 comes in a 4-pin SOT143 package, re-quiring minimal board space. The MAX2631/MAX2632come in small 5-pin SOT23 packages. The MAX2633comes in a 6-pin SOT23 package.________________________ApplicationsPersonal Communicating Systems Cordless Phones Global Positioning Systems Cellular Phones Wireless Local Area Networks ISM Radios Wireless Local Loops TV Tuners Land Mobile RadiosSet-Top Boxes____________________________Featureso Single +2.7V to +5.5V Operation o Internally Biased (MAX2630/MAX2631)o Adjustable Bias (MAX2632/MAX2633)o 6.6mA Supply Current (insensitive to supply voltage)o 1µA Shutdown Current (MAX2631/MAX2633)o 3.7dB Noise Figure o 13.4dB Gaino Ultra-Small SOT PackagesMAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers________________________________________________________________Maxim Integrated Products1_________________Pin Configurations__________Typical Operating Circuit______________Ordering Information19-1181; Rev 1; 7/97*The first two letters in the SOT top mark identify the part,while the remaining two letters are the lot-tracking code.For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V, Z 0= 50Ω, f IN = 900MHz, R BIAS = 10k Ω(MAX2632/MAX2633), V SHDN = V CC (MAX2631/MAX2633), T A = +25°C, 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.Note 1:Guaranteed by design and characterization.V CC to GND................................................................-0.3V to 6V Input Power.........................................................................5dBm OUT Current.....................................................................±12mA IN to GND Voltage...................................................-1.2V to 1.2V Bias to GND Voltage....................................................0.0V to 3V Voltage at SHDN Input(MAX2631/MAX2633)............................-0.3V to (V CC + 0.3V)Current into SHDN Input (MAX2631/MAX2633).................100µAContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C).....................320mW SOT23-5 (derate 7.1mW/°C above +70°C).................571mW SOT23-6 (derate 7.1mW/°C above +70°C).................571mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CMAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers_______________________________________________________________________________________3__________________________________________Typical Operating Characteristics(V CC = +3V, V SHDN = V CC (MAX2631/MAX2633), Z 0= 50Ω, f IN = 900MHz, R BIAS = 10k Ω(MAX2632/MAX2633), T A = +25°C, unless otherwise noted.)108642023456SUPPLY CURRENT vs. SUPPLY VOLTAGEV CC (V)I C C (m A )252015105005.02.510.015.0MAX2632/MAX2633GAIN vs. SUPPLY CURRENTI CC (mA)G A I N (d B )7.512.52016128400.10.30.71.11.31.5GAIN vs. FREQUENCY AND VOLTAGEFREQUENCY (GHz)G A I N (d B )0.50.9-5.0-7.5-10.0-12.5-15.00.10.30.71.11.31.5OUTPUT 1dB COMPRESSIONPOWER vs. FREQUENCY AND TEMPERATUREFREQUENCY (GHz)P -1 (d B m )0.50.92016128400.10.30.71.11.31.5GAIN vs. FREQUENCYAND TEMPERATUREFREQUENCY (GHz)G A I N (d B )0.50.9-5.0-7.5-10.0-12.5-15.00.10.30.71.11.31.5OUTPUT 1dB COMPRESSIONPOWER vs. FREQUENCY AND VOLTAGEFREQUENCY (GHz)P -1 (d B m )0.50.9-4-8-12-16-202.57.512.515.0MAX2632/MAX2633OUTPUT 1dB COMPRESSION POWER vs. SUPPLY CURRENTI CC (mA)P -1 (d B m )5.010.05432100.10.30.50.91.11.5NOISE FIGURE vs. FREQUENCYM A X 2630-8FREQUENCY (GHz)N O I S E F I G U R E (d B )0.71.3M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers 4_____________________________________________________________________________________________________________________________________________________Pin Description15129630110100MAX2632/MAX2633SUPPLY CURRENT vs. R BIASR BIAS (k Ω)I C C (m A)00.010.030.020.040.05-40-2020406080MAX2631/MAX2633SHUTDOWN SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S H U T D O W N I C C (µA )5:14:13:12:11:10.10.30.7 1.1 1.3 1.5VOLTAGE STANDING-WAVE RATIO vs. FREQUENCYFREQUENCY (GHz)V S W R0.50.9____________________________Typical Operating Characteristics (continued)(V CC = +3V, V SHDN = V CC (MAX2631/MAX2633), Z 0= 50Ω, f IN = 900MHz, R BIAS = 10k Ω(MAX2632/MAX2633), T A = +25°C, unless otherwise noted.)MAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers_______________________________________________________________________________________5Table 1a. Typical Scattering Parameters(V CC = +3V, V SHDN = V CC , Z 0= 50Ω, R BIAS = 10k Ω, T A = +25°C.)M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers 6_______________________________________________________________________________________Table 1b. MAX2633 Typical Scattering Parameters(V CC = +5V, V SHDN = V CC , Z 0= 50Ω, R BIAS = 10k, T A = +25°C.)MAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers_______________________________________________________________________________________7_______________Detailed DescriptionThe MAX2630–MAX2633 are broadband amplifiers with 3dB bandwidth greater than 1GHz. Their small size and internal bias circuitry make them ideal for applications where board space is limited. The MAX2632/MAX2633have a user-selectable bias current that allows the user to set both gain and output power for a particular appli-cation, and the MAX2631/MAX2633 incorporate shut-down capability.__________Applications InformationExternal ComponentsThe MAX2630–MAX2633 are easy to use, as shown in the Typical Operating Circuit and Figures 1, 2 and 3. Input and output series capacitors may be necessary to block DC bias voltages generated by the amplifiers from inter-acting with adjacent circuitry. These capacitors must be large enough to contribute negligible reactance in a 50Ωsystem at the minimum operating frequency. Use the fol-lowing equation to calculate their minimum value:where f (in megahertz) is the minimum operating frequency.The V CC pin must be RF bypassed for correct opera-tion. To accomplish this, connect a capacitor between the V CC pin and ground, as close to the package as is practical. Use the same equation given above (for DC-blocking capacitor values) to calculate the minimum capacitor value. If the PC board has long V CC lines,additional bypassing may be necessary. This can be done farther away from the package, if needed.Proper grounding of the GND pin is essential. If the PC board uses a topside RF ground, connect it directly to the GND pin. For a board where the ground plane is not on the component side, the best technique is to con-nect the GND pin to it with a plated through-hole close to the package.An on-chip buffer at the MAX2631/MAX2633’s SHDN pin makes bypassing this pin unnecessary except in very noisy applications. When RF filtering is needed,use a bypass capacitor similar to the one used on V CC .Since negligible current flows into this pin, additional RF filtering may be done with a series resistor.To set the MAX2632/MAX2633’s supply current,connect a resistor from the BIAS pin to ground. To estimate the value of this resistor, refer to the graph Supply Current vs. R BIAS in the Typical Operating Characteristics .C BLOCK =53,000f(pF)M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers 8_______________________________________________________________________________________Figure 4. MAX2630 Example PC Board LayoutFigure 5. MAX2631 Example PC Board LayoutFigure 7. MAX2633 Example PC Board LayoutFigure 6. MAX2632 Example PC Board Layout PC Board Layout ExampleExample PC board layouts are given in Figures 4 to 7.They use FR-4 with a 31mil layer thickness between the RF lines and the ground plane. The boards satisfy all of the above recommendations.MAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers_______________________________________________________________________________________9__________________________________________________Tape-and-Reel Information___________________Chip InformationTRANSISTOR COUNT: 199M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers 10______________________________________________________________________________________________________________________________________________Package InformationMAX2630–MAX2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers ______________________________________________________________________________________11___________________________________________Package Information (continued)M A X 2630–M A X 2633VHF-to-Microwave, +3V ,General-Purpose Amplifiers___________________________________________Package Information (continued)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©1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.。

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______________________________________________________________________________________。

MAX807中文资料

MAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy________________________________________________________________Maxim Integrated Products1Call toll free 1-800-998-8800 for free samples or literature.19-0433; Rev 0; 9/95_______________General DescriptionThe MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control func-tions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suit-able for larger, higher-performance equipment.The MAX807 comes in 16-pin DIP and SO packages, and provides the following functions:1)output is asserted dur-ing power-up, power-down, and brownout conditions,and is guaranteed to be in the correct state for V CC down to 1V.2)Active-high RESET output.3)Manual-reset input.4)Two-stage power-fail warning. A separate low-line comparator compares V CC to a threshold 52mV above the reset threshold. This low-line comparator is more accurate than those in previous µP supervisors.5) Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.6)Write protection of CMOS RAM or EEPROM.7) 2.275V threshold detector—provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.8)BATT OK status flag indicates that the backup-battery voltage is above 2.275V.9)Watchdog-fault output—asserted if the watchdog input has not been toggled within a preset timeout period.________________________ApplicationsComputers ControllersIntelligent Instruments Critical µP Power Monitoring Portable/Battery-Powered Equipment____________________________Featureso Precision 4.675V (MAX807L) or 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring o 200ms Power OK / Reset Time Delay o and RESET Outputs o Independent Watchdog Timer o 1µA Standby Currento Power Switching:250mA in V CC Mode20mA in Battery-Backup Modeo On-Board Gating of Chip-Enable Signals:2ns CE Gate Propagation Delay o MaxCap™and SuperCap™Compatible o Voltage Monitor for Power-Fail o Backup-Battery Monitoro Guaranteed RESET Valid to V CC = 1Vo ±1.5% Low-line Threshold Accuracy 52mV above Reset Threshold__________________Pin ConfigurationOrdering Information and Typical Operating Circuit appear at end of data sheet.SuperCap is a trademark of Baknor Industries. MaxCap is a trademark of The Carborundum Corp.M A X 807L /M /NFull-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = 4.60V to 5.5V for the MAX807L, V CC = 4.50V to 5.5V for the MAX807N, V CC = 4.35V to 5.5V for the MAX807M,V= 2.8V, V = 0V, T = T to T . Typical values are tested with V = 5V and T = +25°C, 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.Input Voltages (with respect to GND)V CC ..........................................................................-0.3V to 6V V BATT .......................................................................-0.3V to 6V All Other Inputs......................................-0.3V to (V OUT + 0.3V)Input CurrentV CC Peak ...........................................................................1.0A V CC Continuous.............................................................500mA I BATT Peak......................................................................250mA I BATT Continuous .............................................................50mA GND.................................................................................50mA All Other Inputs................................................................50mAContinuous Power Dissipation (T A = +70°C)Plastic DIP (derate 10.53mW/°C above +70°C)...........842mW Wide SO (derate 9.52mW/°C above +70°C).................762mW CERDIP (derate 10.00mW/°C above +70°C)................800mW Operating Temperature RangesMAX807_C_E.......................................................0°C to +70°C MAX807_E_E....................................................-40°C to +85°C MAX807_MJE .................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = 4.60V to 5.5V for the MAX807L, V CC = 4.50V to 5.5V for the MAX807N, V CC = 4.35V to 5.5V for the MAX807M,V = 2.8V, V = 0V, T = T to T . Typical values are tested with V = 5V and T = +25°C, unless otherwise noted.)M A X 807L /M /NFull-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 4_______________________________________________________________________________________Note 1:Either V CC or V BATT can go to 0V, if the other is greater than 2.0V.Note 2:The supply current drawn by the MAX807 from the battery (excluding I OUT ) typically goes to 15µA when (V BATT - 0.1V)< V CC < V BATT . In most applications, this is a brief period as V CC falls through this region (see Typical Operating Characteristics ).Note 3:“+”= battery discharging current, “-”= battery charging current.Note 4:WDI is internally connected to a voltage divider between V CC and GND. If unconnected, WDI is driven to 1.8V (typical),disabling the watchdog function.Note 5:Overdrive (V OD ) is measured from center of hysteresis band.Note 6:The chip-enable resistance is tested with V CE IN = V CC /2, and I CE IN = 1mA.Note 7:The chip-enable propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT.ELECTRICAL CHARACTERISTICS (continued)(V CC = 4.60V to 5.5V for the MAX807L, V CC = 4.50V to 5.5V for the MAX807N, V CC = 4.35V to 5.5V for the MAX807M,V BATT = 2.8V, V PFI = 0V, T A = T MIN to T MAX . Typical values are tested with V CC = 5V and T A = +25°C, unless otherwise noted.)MAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy_______________________________________________________________________________________58060-60-2060140V CC SUPPLY CURRENT vs. TEMPERATURE(NORMAL OPERATING MODE)6476M A X 807-01TEMPERATURE (°C)V C C S U P P L Y C U R R E N T (µA )20100-404012008072686266787470 3.02.52.01.51.00.50-60-2060140BATTERY SUPPLY CURRENT vs.TEMPERATURE (BATTERY-BACKUP MODE)M A X 807-02TEMPERATURE (°C)B A T T E R Y S U P P L Y C U R R E N T (µA )20100-40401200806543210-60-2060140CHIP-ENABLE PROPAGATION DELAYvs. TEMPERATUREM A X 807-03TEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )20100-4040120080305-60-2060140BATT-to-OUT ON-RESISTANCEvs. TEMPERATURE1025TEMPERATURE (°C)B A T T -t o -O U T O N -R E S I S T A NC E (Ω)20100-404012008020154.704.654.604.554.504.454.40-60-2060140RESET THRESHOLD vs. TEMPERATURETEMPERATURE (°C)R E S E T T H R E S H O L D (V )20100-4040120080 1.61.51.41.31.21.11.00.90.80.7-60-2060140V 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)20100-4040120080 2.3402.3202.3002.2802.2602.2402.2202.200-60-2060140PFI THRESHOLDvs. TEMPERATURE (V PFI FALLING)M A X 807-06TEMPERATURE (°C)P F I T H R E S H O L D (V )20100-4040120080280260240220200180160140-60-2060140RESET TIMEOUT PERIOD vs. TEMPERATURE (V CC RISING)M A X 807-08TEMPERATURE (°C)R E S E T T I M E O U T P E R I O D (m s )20100-404012008001020304050607080-60-2060140LOW LINE -to-RESET THRESHOLD vs. TEMPERATURE (V CC FALLING)M A X 807-09TEMPERATURE (°C)L O W L I N E -t o -R E S E T T H R E S H O L D (m V )20100-4040120080__________________________________________Typical Operating Characteristics(V CC = 5V, V BATT = 2.8V, PFI = 0V, no load, T A = +25°C, unless otherwise noted.)M A X 807L /M /NFull-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 6___________________________________________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = 5V, V BATT = 2.8V, PFI = 0V, no load, T A = +25°C, unless otherwise noted.)4.754.804.704.654.604.554.504.45 4.40-60-2060140LOW LINE THRESHOLDvs. TEMPERATURE (V CC RISING)TEMPERATURE (°C)L O W L I N E T H R E S H O L D (V )20100-40401200800510152025303540-60-2060140LOW LINE COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (V CC FALLING)TEMPERATURE (°C)L O W L I N E C O M P A R A T O R P R O P . D E L A Y (µs )20100-40401200800510152025303540-60-2060140RESET COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (V CC FALLING)TEMPERATURE (°C)R E S E T C O M P A R A T O R P R O P . D E L A Y (µs )20100-404012008002468101214162.52.62.72.82.93.0BATTERY CURRENT vs. INPUT SUPPLY VOLTAGEM A X 807-13V CC (V)B A T T E R YC U R R E N T (µA )10001001011100101000V CC -to-OUT vs. OUTPUT CURRENTI OUT (mA)V C C -V O U T (m V )50Ω DRIVER2468050100CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCEM A X 807-14C LOAD (pF)P R O P A G A T I O N D E L A Y (n s)100010010110100BATT-to-OUT vs. OUTPUT CURRENTI OUT (mA)B A T T -t o -O U T (m V )10001001011100101000MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVERESET COMPARATOR OVERDRIVE (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 )MAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy_______________________________________________________________________________________7______________________________________________________________Pin Description_______________Detailed DescriptionThe MAX807 microprocessor (µP) supervisory circuit provides power-supply monitoring, backup-battery switchover, and program execution watchdog functions in µP systems (Figure 1). Use of BiCMOS technology results in an improved 1.5% reset-threshold precision,while keeping supply currents typically below 70µA.The MAX807 is intended for battery-powered applica-tions that require high reset-threshold precision, allow-ing a wide power-supply operating range while preventing the system from operating below its speci-fied voltage range.RESET and RESET OutputsThe MAX807’s RESET output ensures that the µP pow-ers up in a known state, and prevents code execution errors during power-down and brownout conditions. It accomplishes this by resetting the µP, terminating pro-gram execution when V CC dips below the reset thresh-old or MR is pulled low. Each time RESET is asserted it stays low for the 200ms reset timeout period, which is set by an internal timer to ensure the µP has adequate time to return to an initial state. Any time V CC goes below the reset threshold before the reset timeout peri-od is completed, the internal timer restarts. The watch-dog timer can also initiate a reset if WDO is connected to MR. See the Watchdog Input section.M A X 807L /M /NFull-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 8_______________________________________________________________________________________Figure 1. Block DiagramMAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy_______________________________________________________________________________________9output is active low and implemented with a strong pull-down/relatively weak pull-up structure. It is guaranteed to be a logic low for 0V < V CC < V RST , pro-vided V BATT is greater than 2V. Without a backup bat-is guaranteed valid for V CC ≥1. It typically sinks 3.2mA at 0.1V saturation voltage in its active state.The RESET output is the inverse of the RESET output; it both sources and sinks current and cannot be wire-OR connected.Manual Reset InputMany µP-based products require manual-reset capabil-ity to allow an operator or test technician to initiate a tion of a reset in response to a logic low from a switch,WDO, or external circuitry. Reset remains asserted while MR is low, and for 200ms after MR returns high. MR has an internal 50µA to 200µA pull-up current, so it can be driven with TTL or 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;is dri-ven from long cables or if the device is used in a noisy to ground to provide additional noise immunity. As shown in Figure 3, diode-ORed connections can be used to allow manual resets from multiple sources. Figure 4shows the reset timing.Watchdog InputThe watchdog circuit monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within 1.6sec, WDO goes low. The internal 1.6sec timer is returns high when reset is asserted or when a transition (low-to-high or high-to-low) occurs is high. As long as reset is assert-ed, the timer remains cleared and does not count. As soon as reset is released, the timer starts counting (Figure 5). Supply current is typically reduced by 10µA when WDI is at a valid logic level.Figure 2a. Timing Diagram, V CC Rising Figure 2b. Timing Diagram, V CC FallingM A X 807L /M /NFull-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 10______________________________________________________________________________________Watchdog OutputWDO remains high if there is a transition or pulse at WDI during the watchdog timeout period. WDO goes low if no transition occurs at WDI during the watchdog timeout period. The watchdog function is disabled and WDO is a logic high when V CC is below the reset threshold or WDI is an open circuit. To generate a sys-tem reset on every watchdog fault, simply diode-OR connect WDO to MR (Figure 6). When a watchdog fault occurs in this mode, WDO goes low, which pulls MR low, causing a reset pulse to be issued. As soon as reset is asserted, the watchdog timer clears and WDO returns high. With WDO connected to MR, a continuous high or low on WDI will cause 200ms reset pulses to be issued every 1.6sec.Chip-Enable Signal GatingThe MAX807 provides internal gating of chip-enable (CE) signals to prevent erroneous data from corrupting the CMOS RAM in the event of a power failure. During normal operation, the CE gate is enabled and passes all CE transitions. When reset is asserted, this path becomes disabled, preventing erroneous data from corrupting the CMOS RAM. The MAX807 uses a series transmission gate from the Chip-Enable Input (CE IN) to the Chip-Enable Output (CE OUT) (Figure 1).The 8ns max chip-enable propagation from CE IN to CE OUT enables the MAX807 to be used with most µPs.Chip-Enable InputCE IN is high impedance (disabled mode) while RESET is asserted. During a power-down sequence when V CC passes the reset threshold, the CE transmission gate disables and CE IN becomes high impedance 28µs after reset is asserted (Figure 7). During a power-up sequence, CE IN remains high impedance (regardless of CE IN activity) until reset is deasserted following the reset-timeout period.In the high-impedance mode, the leakage currents into this input are ±1µA max over temperature. In the low-impedance mode, the impedance of CE IN appears as a 75Ωresistor in series with the load at CE OUT.The propagation delay through the CE transmission gate depends on both the source impedance of the drive to CE IN and the capacitive loading on CE OUTFigure 4. Manual-Reset Timing DiagramFigure 5. Watchdog Timing Relationship Figure 6. Generating a Reset on Each Watchdog FaultMAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy______________________________________________________________________________________11Load Capacitance graph in the Typical Operating Characteristics ). The CE propagation delay is produc-tion tested from the 50% point on CE IN to the 50%point on CE OUT using a 50Ωdriver and 50pF of load capacitance (Figure 8). For minimum propagation delay, minimize the capacitive load at CE OUT and use a low output-impedance driver.Chip-Enable OutputIn the enabled mode, the impedance of CE OUT is equiv-alent to 75Ωin series with the source driving CE IN. In the disabled mode, the 75Ωtransmission gate is off and CE OUT is actively pulled to the higher of V CC or V BATT . This source turns off when the transmission gate is enabled.Low-Line ComparatorThe low-line comparator monitors V CC with a threshold voltage typically 52mV above the reset threshold, with 13mV of hysteresis. Use LOW LINE to provide a non-maskable interrupt (NMI) to the µP when power begins to fall, to initiate an orderly software shutdown routine.In most battery-operated portable systems, reserve energy in the battery provides ample time to complete the shutdown routine once the low-line warning is encountered, and before reset asserts. If the system must contend with a more rapid V CC fall time—such as when the main battery is disconnected, a DC-DC con-verter shuts down, or a high-side switch is opened dur-ing normal operation—use capacitance on the V CC line to provide time to execute the shutdown routine (Figure 9). First calculate the worst-case time required for the system to perform its shutdown routine. Then, with theand the minimum low-line to reset threshold (V LR(min)),calculate the amount of capacitance required to allow the shutdown routine to complete before reset is asserted:C HOLD = (I LOAD x t SHDN ) / V LR (min)where t SHDN is the time required for the system to com-plete the shutdown routine, and includes the V CC to low-line propagation delay; and where I LOAD is the cur-rent being drained from the capacitor, V LR is the low-line to reset threshold.Figure 8. CE Propagation Delay Test CircuitM A X 807L /M /NPower-Fail ComparatorPFI is the noninverting input to an uncommitted com-parator. If PFI is less than V PFT (2.265V), PFO goes low.The power-fail comparator is intended to monitor the preregulated input of the power supply, providing an early power-fail warning so software can conduct an orderly shutdown. It can also be used to monitor sup-plies other than 5V. Set the power-fail threshold with a resistor divider, as shown in Figure 10.Power-Fail InputPFI is the input to the power-fail comparator. The typical comparator delay is 14µs from V IL to V OL (power failing),and 32µs from V IH to V OH (power being restored). If unused, connect this input to ground.Power-Fail OutputThe Power-Fail Output (PFO) goes low when PFI goes below V PFT . It typically sinks 3.2mA with a saturation voltage of 0.1V. With PFI above V PFT , PFO is actively pulled to V CC . Connecting PFI through a voltage divider to a preregulated supply allows PFO to generate an NMI as the preregulated power begins to fall (Figure 11b). If the preregulated supply is inaccessible, use LOW LINE LINE threshold is typically 52mV above the reset threshold (see Low-Line Comparator section).Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 12______________________________________________________________________________________Figure 10. Using the Power-Fail Comparator to Monitor an Additional Power Supply: a) V IN is Negative, b) V IN is PositiveFigure 11. a) If the preregulated supply is inaccessible, LOW LINE generates the NMI for the µP. b) Use PFO to generate the µP NMI if the preregulated supply is accessible.Battery-Backup ModeBattery backup preserves the contents of RAM in the event of a brownout or power failure. With a backup battery installed at BATT, the MAX807 automatically switches RAM to backup power when V CC falls. Two conditions are required for switchover to battery-back-up mode: 1) V CC must be below the reset threshold; 2)V CC must be below V BATT . Table 1 lists the status of inputs and outputs during battery-backup mode.Backup-Battery InputThe BATT input is similar to V CC , except the PMOS switch is much smaller. This input is designed to con-duct up to 20mA to OUT during battery backup. The on-resistance of the PMOS switch is approximately 13Ω. Figure 12 shows the two series pass elements between the BATT input and OUT that facilitates UL approval. V BATT can exceed V CC during normal opera-tion without causing a reset.Output Supply VoltageThe output supply (OUT) transfers power from V CC or BATT to the µP, RAM, and other external circuitry. At the maximum source current of 250mA, V OUT will typi-cally be 260mV below V CC . Decouple this terminal with a 0.1µF capacitor.BATT ON OutputThe battery on (BATT ON) output indicates the status of the internal battery switchover comparator, which con-trols the internal V CC and BATT switches. For V CC greater than V BATT (ignoring the small hysteresis effect), BATT ON typically sinks 3.2mA at 0.4V. In bat-tery-backup mode, this output sources approximately 5mA. Use BATT ON to indicate battery switchover sta-tus, or to supply gate or base drive for an external pass transistor for higher current applications (see Typical Operating Circuit ).MAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy______________________________________________________________________________________13Figure 12. V CC and BATT-to-OUT SwitchTable 1. Input and Output Status in Battery-Backup ModeM A X 807L /M /NBATT OK OutputThe BATT OK comparator monitors the backup battery voltage, comparing it with a 2.265V reference (V CC ≥4V). BATT OK remains high as long as the backup bat-tery voltage remains above 2.265V, signaling that the backup battery has sufficient voltage to maintain the memory of static RAM. When the battery voltage drops below 2.265V, the BATT OK output drops low, signaling that the backup battery needs to be changed.__________Applications InformationThe MAX807 is not short-circuit protected. Shorting OUT to ground, other than power-up transients such as charging a decoupling capacitor, may destroy the device. If long leads connect to the IC’s inputs, ensure that these lines are free from ringing and other condi-tions that would forward bias the IC’s protection diodes.There are two distinct modes of operation:1)Normal Operating Mode, with all circuitry powered up. Typical supply current from V CC is 70µA, while only leakage currents flow from the battery.2)Battery-Backup Mode, where V CC is below V BATTand V RST . The supply current from the battery is typ-ically less than 1µA.Using SuperCaps™ orMaxCaps™ with the MAX807BATT has the same operating voltage range as V CC , and the battery-switchover threshold voltage is typically V BATT when V CC is decreasing or V BATT + 0.06V when V CC is increasing. This hysteresis allows use of aSuperCap (e.g., order of 0.47F) and a simple charging circuit as a backup source (Figure 13). Since V BATT can exceed V CC while V CC is above the reset threshold,there are no special precautions when using these µP supervisors with a SuperCap.Alternative Chip-Enable GatingUsing memory devices with CE and CE inputs allows the MAX807 CE loop to be bypassed. To do this, con-nect CE IN to ground, pull up CE OUT to OUT, and connect CE OUT to the CE input of each memory device (Figure 14). The CE input of each part then con-nects directly to the chip-select logic, which does not have to be gated by the MAX807.Adding Hysteresis to the Power-Fail ComparatorThe power-fail comparator has a typical input hystere-sis of 20mV. This is sufficient for most applications where a power-supply line is being monitored through an external voltage divider (Figure 10).Figure 15 shows how to add hysteresis to the power-fail comparator. Select the ratio of R1 and R2 such that PFI sees 2.265V when V IN falls to the desired trip point (V TRIP ). Resistor R3 adds hysteresis. It will typically be an order of magnitude greater than R1 or R2. The cur-rent through R1 and R2 should be at least 1µA to ensure that the 25nA (max) PFI input current does not shift the trip point. R3 should be larger than 10k Ωto prevent it from loading down the PFO pin. Capacitor C1adds additional noise rejection.Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 14______________________________________________________________________________________Figure 13. SuperCap or MaxCap on BATTFigure 14. Alternate CE GatingBackup-Battery ReplacementThe backup battery may be disconnected while V CC is above the reset threshold, provided BATT is bypassed with a 0.1µF capacitor to ground. No precautions are necessary to avoid spurious reset pulses.Negative-Going V CC TransientsWhile issuing resets to the µP during power-up, power-down, and brownout conditions, these supervisors are relatively immune to short-duration negative-going V CC transients (glitches). It is usually undesirable to reset the µP when V CC experiences only small glitches.The Typical Operating Characteristics show Maximum Transient Duration vs. Reset Comparator Overdrive, for which reset pulses are not generated. The graph was produced using negative-going V CC pulses, starting at 5V and ending below the reset threshold by the magni-tude indicated (reset comparator overdrive). The graph shows the maximum 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 tran-sient increases (i.e., goes farther below the reset threshold), the maximum allowable pulse width decreases.Typically, a V CC transient that goes 40mV below the reset threshold and lasts for 3µs or less will not cause a reset pulse to be issued.A 0.1µF bypass capacitor mounted close to the V CC pin provides additional transient immunity.Watchdog Software ConsiderationsTo help the watchdog timer keep a closer watch on soft-ware execution, you can use the method of setting and resetting the watchdog input at different points in the program, rather than “pulsing” the watchdog input high-low-high or low-high-low. This technique avoids a “stuck”loop where the watchdog timer continues to be reset within the loop, keeping the watchdog from timing out.Figure 16 shows an example flow diagram where the I/O driving the watchdog input is set high at the begin-ning of the program, set low at the beginning of every subroutine or loop, then set high again when the pro-gram returns to the beginning. If the program should “hang” in any subroutine, the I/O is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued.Maximum V CC Fall TimeThe V CC fall time is limited by the propagation delay of the battery switchover comparator and should not exceed 0.03V/µs. A standard rule for filter capacitance on most regulators is on the order of 100µF per amp of current. When the power supply is shut off or the main battery is disconnected, the associated initial V CC fall rate is just the inverse or 1A / 100µF = 0.01V/µs. The V CC fall rate decreases with time as V CC falls exponen-tially, which more than satisfies the maximum fall-time requirement.MAX807L/M/NFull-Featured µP Supervisory Circuit with±1.5% Reset Accuracy______________________________________________________________________________________15Figure 15. Adding Hysteresis to the Power-Fail ComparatorFigure 16. Watchdog Flow Diagram。

MAX6305中文资料

For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.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 devicesFeatureso 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 TransientsMAX6305–MAX63135-Pin, Multiple-Input,Programmable Reset ICs________________________________________________________________Maxim Integrated Products 119-1145; Rev 1; 8/98M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 2_______________________________________________________________________________________ABSOLUTE 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/MAX6310/MAX6312/MAX6313; T A = 0°C to +70°C; unless otherwise noted. Typical values are at T A = +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.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/µsContinuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C).................571mW Operating Temperature Range...............................0°C to +70°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/MAX6310/MAX6312/MAX6313; T A = 0°C to +70°C; unless otherwise noted. Typical values are at T A = +25°C.)Note 1: The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < V CC < 2.5V.Note 2: 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).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.V CC 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 (Figure 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 ) (Figure 2). Calculate the desired reset voltage with the following formula:R1 + R2V TH = ________x V RSTHR25-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 *MAX6305UK00D1-T ABAK MAX6306UK41D3-T ABCA MAX6306UK30D1-T ABDQ MAX6307UK46D3-T ABFG MAX6305UK00D2-T ABAL MAX6306UK41D4-T ABCB MAX6306UK30D2-T ABDR MAX6307UK46D4-T ABFH MAX6305UK00D3-T ABAM MAX6306UK40D1-T ABCC MAX6306UK30D3-T ABDS MAX6307UK45D1-T ABFI MAX6305UK00D4-T ABAN MAX6306UK40D2-T ABCD MAX6306UK30D4-T ABDT MAX6307UK45D2-T ABFJ MAX6306UK50D1-T ABAO MAX6306UK40D3-T ABCE MAX6306UK29D1-T ABDU MAX6307UK45D3-T ABFK MAX6306UK50D2-T ABAP MAX6306UK40D4-T ABCF MAX6306UK29D2-T ABDV MAX6307UK45D4-T ABFL MAX6306UK50D3-T ABAQ MAX6306UK39D1-T ABCG MAX6306UK29D3-T ABDW MAX6307UK44D1-T ABFM MAX6306UK50D4-T ABAR MAX6306UK39D2-T ABCH MAX6306UK29D4-T ABDX MAX6307UK44D2-T ABFN MAX6306UK49D1-T ABAS MAX6306UK39D3-T ABCI MAX6306UK28D1-T ABDY MAX6307UK44D3-T ABFO MAX6306UK49D2-T ABAT MAX6306UK39D4-T ABCJ MAX6306UK28D2-T ABDZ MAX6307UK44D4-T ABFP MAX6306UK49D3-T ABAU MAX6306UK38D1-T ABCK MAX6306UK28D3-T ABEA MAX6307UK43D1-T ABFQ MAX6306UK49D4-T ABAV MAX6306UK38D2-T ABCL MAX6306UK28D4-T ABEB MAX6307UK43D2-T ABFR MAX6306UK48D1-T ABAW MAX6306UK38D3-T ABCM MAX6306UK27D1-T ABEC MAX6307UK43D3-T ABFS MAX6306UK48D2-T ABAX MAX6306UK38D4-T ABCN MAX6306UK27D2-T ABED MAX6307UK43D4-T ABFT MAX6306UK48D3-T ABAY MAX6306UK37D1-T ABCO MAX6306UK27D3-T ABEE MAX6307UK42D1-T ABFU MAX6306UK48D4-T ABAZ MAX6306UK37D2-T ABCP MAX6306UK27D4-T ABEF MAX6307UK42D2-T ABFV MAX6306UK47D1-T ABBA MAX6306UK37D3-T ABCQ MAX6306UK26D1-T ABEG MAX6307UK42D3-T ABFW MAX6306UK47D2-T ABBB MAX6306UK37D4-T ABCR MAX6306UK26D2-T ABEH MAX6307UK42D4-T ABFX MAX6306UK47D3-T ABBC MAX6306UK36D1-T ABCS MAX6306UK26D3-T ABEI MAX6307UK41D1-T ABFY MAX6306UK47D4-T ABBD MAX6306UK36D2-T ABCT MAX6306UK26D4-T ABEJ MAX6307UK41D2-T ABFZ MAX6306UK46D1-T ABBE MAX6306UK36D3-T ABCU MAX6306UK25D1-T ABEK MAX6307UK41D3-T ABGA MAX6306UK46D2-T ABBF MAX6306UK36D4-T ABCV MAX6306UK25D2-T ABEL MAX6307UK41D4-T ABGB MAX6306UK46D3-T ABBG MAX6306UK35D1-T ABCW MAX6306UK25D3-T ABEM MAX6307UK40D1-T ABGC MAX6306UK46D4-T ABBH MAX6306UK35D2-T ABCX MAX6306UK25D4-T ABEN MAX6307UK40D2-T ABGD MAX6306UK45D1-T ABBI MAX6306UK35D3-T ABCY MAX6307UK50D1-T ABEO MAX6307UK40D3-T ABGE MAX6306UK45D2-T ABBJ MAX6306UK35D4-T ABCZ MAX6307UK50D2-T ABEP MAX6307UK40D4-T ABGF MAX6306UK45D3-T ABBK MAX6306UK34D1-T ABDA MAX6307UK50D3-T ABEQ MAX6307UK39D1-T ABGG MAX6306UK45D4-T ABBL MAX6306UK34D2-T ABDB MAX6307UK50D4-T ABER MAX6307UK39D2-T ABGH MAX6306UK44D1-T ABBM MAX6306UK34D3-T ABDC MAX6307UK49D1-T ABES MAX6307UK39D3-T ABGI MAX6306UK44D2-T ABBN MAX6306UK34D4-T ABDD MAX6307UK49D2-T ABET MAX6307UK39D4-T ABGJ MAX6306UK44D3-T ABBO MAX6306UK33D1-T ABDE MAX6307UK49D3-T ABEU MAX6307UK38D1-T ABGK MAX6306UK44D4-T ABBP MAX6306UK33D2-T ABDF MAX6307UK49D4-T ABEV MAX6307UK38D2-T ABGL MAX6306UK43D1-T ABBQ MAX6306UK33D3-T ABDG MAX6307UK48D1-T ABEW MAX6307UK38D3-T ABGM MAX6306UK43D2-T ABBR MAX6306UK33D4-T ABDH MAX6307UK48D2-T ABEX MAX6307UK38D4-T ABGN MAX6306UK43D3-T ABBS MAX6306UK32D1-T ABDI MAX6307UK48D3-T ABEY MAX6307UK37D1-T ABGO MAX6306UK43D4-T ABBT MAX6306UK32D2-T ABDJ MAX6307UK48D4-T ABEZ MAX6307UK37D2-T ABGP MAX6306UK42D1-T ABBU MAX6306UK32D3-T ABDK MAX6307UK47D1-T ABFA MAX6307UK37D3-T ABGQ MAX6306UK42D2-T ABBV MAX6306UK32D4-T ABDL MAX6307UK47D2-T ABFB MAX6307UK37D4-T ABGR MAX6306UK42D3-T ABBW MAX6306UK31D1-T ABDM MAX6307UK47D3-T ABFC MAX6307UK36D1-T ABGS MAX6306UK42D4-T ABBX MAX6306UK31D2-T ABDN MAX6307UK47D4-T ABFD MAX6307UK36D2-T ABGT MAX6306UK41D1-T ABBY MAX6306UK31D3-T ABDO MAX6307UK46D1-T ABFE MAX6307UK36D3-T ABGU MAX6306UK41D2-TABBZMAX6306UK31D4-TABDPMAX6307UK46D2-TABFFMAX6307UK36D4-TABGVMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________9Table 2. Device Marking CodesDEVICECODE DEVICECODE DEVICECODE DEVICECODEM A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 10______________________________________________________________________________________Table 2. Device Marking Codes (continued)MAX6307UK35D1-T ABGW MAX6307UK25D3-T ABIM MAX6309UK41D1-T ABKC MAX6309UK31D3-T ABLS MAX6307UK35D2-T ABGX MAX6307UK25D4-T ABIN MAX6309UK41D2-T ABKD MAX6309UK31D4-T ABLT MAX6307UK35D3-T ABGY MAX6308UK00D1-T ABIO MAX6309UK41D3-T ABKE MAX6309UK30D1-T ABLU MAX6307UK35D4-T ABGZ MAX6308UK00D2-T ABIP MAX6309UK41D4-T ABKF MAX6309UK30D2-T ABLV MAX6307UK34D1-T ABHA MAX6308UK00D3-T ABIQ MAX6309UK40D1-T ABKG MAX6309UK30D3-T ABLW MAX6307UK34D2-T ABHB MAX6308UK00D4-T ABIR MAX6309UK40D2-T ABKH MAX6309UK30D4-T ABLX MAX6307UK34D3-T ABHC MAX6309UK50D1-T ABIS MAX6309UK40D3-T ABKI MAX6309UK29D1-T ABLY MAX6307UK34D4-T ABHD MAX6309UK50D2-T ABIT MAX6309UK40D4-T ABKJ MAX6309UK29D2-T ABLZ MAX6307UK33D1-T ABHE MAX6309UK50D3-T ABIU MAX6309UK39D1-T ABKK MAX6309UK29D3-T ABMA MAX6307UK33D2-T ABHF MAX6309UK50D4-T ABIV MAX6309UK39D2-T ABKL MAX6309UK29D4-T ABMB MAX6307UK33D3-T ABHG MAX6309UK49D1-T ABIW MAX6309UK39D3-T ABKM MAX6309UK28D1-T ABMC MAX6307UK33D4-T ABHH MAX6309UK49D2-T ABIX MAX6309UK39D4-T ABKN MAX6309UK28D2-T ABMD MAX6307UK32D1-T ABHI MAX6309UK49D3-T ABIY MAX6309UK38D1-T ABKO MAX6309UK28D3-T ABME MAX6307UK32D2-T ABHJ MAX6309UK49D4-T ABIZ MAX6309UK38D2-T ABKP MAX6309UK28D4-T ABMF MAX6307UK32D3-T ABHK MAX6309UK48D1-T ABJA MAX6309UK38D3-T ABKQ MAX6309UK27D1-T ABMG MAX6307UK32D4-T ABHL MAX6309UK48D2-T ABJB MAX6309UK38D4-T ABKR MAX6309UK27D2-T ABMH MAX6307UK31D1-T ABHM MAX6309UK48D3-T ABJC MAX6309UK37D1-T ABKS MAX6309UK27D3-T ABMI MAX6307UK31D2-T ABHN MAX6309UK48D4-T ABJD MAX6309UK37D2-T ABKT MAX6309UK27D4-T ABMJ MAX6307UK31D3-T ABHO MAX6309UK47D1-T ABJE MAX6309UK37D3-T ABKU MAX6309UK26D1-T ABMK MAX6307UK31D4-T ABHP MAX6309UK47D2-T ABJF MAX6309UK37D4-T ABKV MAX6309UK26D2-T ABML MAX6307UK30D1-T ABHQ MAX6309UK47D3-T ABJG MAX6309UK36D1-T ABKW MAX6309UK26D3-T ABMM MAX6307UK30D2-T ABHR MAX6309UK47D4-T ABJH MAX6309UK36D2-T ABKX MAX6309UK26D4-T ABMN MAX6307UK30D3-T ABHS MAX6309UK46D1-T ABJI MAX6309UK36D3-T ABKY MAX6309UK25D1-T ABMO MAX6307UK30D4-T ABHT MAX6309UK46D2-T ABJJ MAX6309UK36D4-T ABKZ MAX6309UK25D2-T ABMP MAX6307UK29D1-T ABHU MAX6309UK46D3-T ABJK MAX6309UK35D1-T ABLA MAX6309UK25D3-T ABMQ MAX6307UK29D2-T ABHV MAX6309UK46D4-T ABJL MAX6309UK35D2-T ABLB MAX6309UK25D4-T ABMR MAX6307UK29D3-T ABHW MAX6309UK45D1-T ABJM MAX6309UK35D3-T ABLC MAX6310UK50D1-T ABMS MAX6307UK29D4-T ABHX MAX6309UK45D2-T ABJN MAX6309UK35D4-T ABLD MAX6310UK50D2-T ABMT MAX6307UK28D1-T ABHY MAX6309UK45D3-T ABJO MAX6309UK34D1-T ABLE MAX6310UK50D3-T ABMU MAX6307UK28D2-T ABHZ MAX6309UK45D4-T ABJP MAX6309UK34D2-T ABLF MAX6310UK50D4-T ABMV MAX6307UK28D3-T ABIA MAX6309UK44D1-T ABJQ MAX6309UK34D3-T ABLG MAX6310UK49D1-T ABMW MAX6307UK28D4-T ABIB MAX6309UK44D2-T ABJR MAX6309UK34D4-T ABLH MAX6310UK49D2-T ABMX MAX6307UK27D1-T ABIC MAX6309UK44D3-T ABJS MAX6309UK33D1-T ABLI MAX6310UK49D3-T ABMY MAX6307UK27D2-T ABID MAX6309UK44D4-T ABJT MAX6309UK33D2-T ABLJ MAX6310UK49D4-T ABMZ MAX6307UK27D3-T ABIE MAX6309UK43D1-T ABJU MAX6309UK33D3-T ABLK MAX6310UK48D1-T ABNA MAX6307UK27D4-T ABIF MAX6309UK43D2-T ABJV MAX6309UK33D4-T ABLL MAX6310UK48D2-T ABNB MAX6307UK26D1-T ABIG MAX6309UK43D3-T ABJW MAX6309UK32D1-T ABLM MAX6310UK48D3-T ABNC MAX6307UK26D2-T ABIH MAX6309UK43D4-T ABJX MAX6309UK32D2-T ABLN MAX6310UK48D4-T ABND MAX6307UK26D3-T ABII MAX6309UK42D1-T ABJY MAX6309UK32D3-T ABLO MAX6310UK47D1-T ABNE MAX6307UK26D4-T ABIJ MAX6309UK42D2-T ABJZ MAX6309UK32D4-T ABLP MAX6310UK47D2-T ABNF MAX6307UK25D1-T ABIK MAX6309UK42D3-T ABKA MAX6309UK31D1-T ABLQ MAX6310UK47D3-T ABNG MAX6307UK25D2-TABILMAX6309UK42D4-TABKBMAX6309UK31D2-TABLRMAX6310UK47D4-TABNHDEVICECODE DEVICECODE DEVICECODE DEVICECODEMAX6305–MAX6313Programmable Reset ICs______________________________________________________________________________________11Table 2. Device Marking Codes (continued)MAX6310UK46D1-T ABNI MAX6310UK36D3-T ABOY MAX6310UK25D1-T ABQO MAX6312UK42D3-T ABSE MAX6310UK46D2-T ABNJ MAX6310UK36D4-T ABOZ MAX6310UK25D2-T ABQP MAX6312UK42D4-T ABSF MAX6310UK46D3-T ABNK MAX6310UK35D1-T ABPA MAX6310UK25D3-T ABQQ MAX6312UK41D1-T ABSG MAX6310UK46D4-T ABNL MAX6310UK35D2-T ABPB MAX6310UK25D4-T ABQR MAX6312UK41D2-T ABSH MAX6310UK45D1-T ABNM MAX6310UK35D3-T ABPC MAX6311UK00D1-T ABQS MAX6312UK41D3-T ABSI MAX6310UK45D2-T ABNN MAX6310UK35D4-T ABPD MAX6311UK00D2-T ABQT MAX6312UK41D4-T ABSJ MAX6310UK45D3-T ABNO MAX6310UK34D1-T ABPE MAX6311UK00D3-T ABQU MAX6312UK40D1-T ABSK MAX6310UK45D4-T ABNP MAX6310UK34D2-T ABPF MAX6311UK00D4-T ABQV MAX6312UK40D2-T ABSL MAX6310UK44D1-T ABNQ MAX6310UK34D3-T ABPG MAX6311UK50D1-T ABQW MAX6312UK40D3-T ABSM MAX6310UK44D2-T ABNR MAX6310UK34D4-T ABPH MAX6312UK50D2-T ABQX MAX6312UK40D4-T ABSN MAX6310UK44D3-T ABNS MAX6310UK33D1-T ABPI MAX6312UK50D3-T ABQY MAX6312UK39D1-T ABSO MAX6310UK44D4-T ABNT MAX6310UK33D2-T ABPJ MAX6312UK50D4-T ABQZ MAX6312UK39D2-T ABSP MAX6310UK43D1-T ABNU MAX6310UK33D3-T ABPK MAX6312UK49D1-T ABRA MAX6312UK39D3-T ABSQ MAX6310UK43D2-T ABNV MAX6310UK33D4-T ABPL MAX6312UK49D2-T ABRB MAX6312UK39D4-T ABSR MAX6310UK43D3-T ABNW MAX6310UK32D1-T ABPM MAX6312UK49D3-T ABRC MAX6312UK38D1-T ABSS MAX6310UK43D4-T ABNX MAX6310UK32D2-T ABPN MAX6312UK49D4-T ABRD MAX6312UK38D2-T ABST MAX6310UK42D1-T ABNY MAX6310UK32D3-T ABPO MAX6312UK48D1-T ABRE MAX6312UK38D3-T ABSU MAX6310UK42D2-T ABNZ MAX6310UK32D4-T ABPP MAX6312UK48D2-T ABRF MAX6312UK38D4-T ABSV MAX6310UK42D3-T ABOA MAX6310UK31D1-T ABPQ MAX6312UK48D3-T ABRG MAX6312UK37D1-T ABSW MAX6310UK42D4-T ABOB MAX6310UK31D2-T ABPR MAX6312UK48D4-T ABRH MAX6312UK37D2-T ABSX MAX6310UK41D1-T ABOC MAX6310UK31D3-T ABPS MAX6312UK47D1-T ABRI MAX6312UK37D3-T ABSY MAX6310UK41D2-T ABOD MAX6310UK31D4-T ABPT MAX6312UK47D2-T ABRJ MAX6312UK37D4-T ABSZ MAX6310UK41D3-T ABOE MAX6310UK30D1-T ABPU MAX6312UK47D3-T ABRK MAX6312UK36D1-T ABTA MAX6310UK41D4-T ABOF MAX6310UK30D2-T ABPV MAX6312UK47D4-T ABRL MAX6312UK36D2-T ABTB MAX6310UK40D1-T ABOG MAX6310UK30D3-T ABPW MAX6312UK46D1-T ABRM MAX6312UK36D3-T ABTC MAX6310UK40D2-T ABOH MAX6310UK30D4-T ABPX MAX6312UK46D2-T ABRN MAX6312UK36D4-T ABTD MAX6310UK40D3-T ABOI MAX6310UK29D1-T ABPY MAX6312UK46D3-T ABRO MAX6312UK35D1-T ABTE MAX6310UK40D4-T ABOJ MAX6310UK29D2-T ABPZ MAX6312UK46D4-T ABRP MAX6312UK35D2-T ABTF MAX6310UK39D1-T ABOK MAX6310UK29D3-T ABQA MAX6312UK45D1-T ABRQ MAX6312UK35D3-T ABTG MAX6310UK39D2-T ABOL MAX6310UK29D4-T ABQB MAX6312UK45D2-T ABRR MAX6312UK35D4-T ABTH MAX6310UK39D3-T ABOM MAX6310UK28D1-T ABQC MAX6312UK45D3-T ABRS MAX6312UK34D1-T ABTI MAX6310UK39D4-T ABON MAX6310UK28D2-T ABQD MAX6312UK45D4-T ABRT MAX6312UK34D2-T ABTJ MAX6310UK38D1-T ABOO MAX6310UK28D3-T ABQE MAX6312UK44D1-T ABRU MAX6312UK34D3-T ABTK MAX6310UK38D2-T ABOP MAX6310UK28D4-T ABQF MAX6312UK44D2-T ABRV MAX6312UK34D4-T ABTL MAX6310UK38D3-T ABOQ MAX6310UK27D1-T ABQG MAX6312UK44D3-T ABRW MAX6312UK33D1-T ABTM MAX6310UK38D4-T ABOR MAX6310UK27D2-T ABQH MAX6312UK44D4-T ABRX MAX6312UK33D2-T ABTN MAX6310UK37D1-T ABOS MAX6310UK27D3-T ABQI MAX6312UK43D1-T ABRY MAX6312UK33D3-T ABTO MAX6310UK37D2-T ABOT MAX6310UK27D4-T ABQJ MAX6312UK43D2-T ABRZ MAX6312UK33D4-T ABTP MAX6310UK37D3-T ABOU MAX6310UK26D1-T ABQK MAX6312UK43D3-T ABSA MAX6312UK32D1-T ABTQ MAX6310UK37D4-T ABOV MAX6310UK26D2-T ABQL MAX6312UK43D4-T ABSB MAX6312UK32D2-T ABTR MAX6310UK36D1-T ABOW MAX6310UK26D3-T ABQM MAX6312UK42D1-T ABSC MAX6312UK32D3-T ABTS MAX6310UK36D2-TABOXMAX6310UK26D4-TABQNMAX6312UK42D2-TABSDMAX6312UK32D4-TABTTDEVICECODE DEVICECODE DEVICECODE DEVICECODEM A X 6305–M A X 6313Programmable Reset ICs 12______________________________________________________________________________________Table 2. Device Marking Codes (continued)MAX6313UK49D2-T ABVB MAX6313UK49D3-T ABVC MAX6313UK49D4-T ABVD MAX6313UK48D1-T ABVE MAX6313UK48D2-T ABVF MAX6313UK48D3-T ABVG MAX6313UK48D4-T ABVH MAX6313UK47D1-T ABVI MAX6313UK47D2-T ABVJ MAX6313UK47D3-T ABVK MAX6313UK47D4-T ABVL MAX6313UK46D1-T ABVM MAX6313UK46D2-T ABVN MAX6313UK46D3-T ABVO MAX6313UK46D4-T ABVP MAX6313UK45D1-T ABVQ MAX6313UK45D2-T ABVR MAX6313UK45D3-T ABVS MAX6313UK45D4-T ABVT MAX6313UK44D1-T ABVU MAX6313UK44D2-T ABVV MAX6313UK44D3-T ABVW MAX6313UK44D4-T ABVX MAX6313UK43D1-T ABVY MAX6313UK43D2-T ABVZ MAX6313UK43D3-T ABWA MAX6313UK43D4-T ABWB MAX6313UK42D1-T ABWC MAX6313UK42D2-T ABWD MAX6313UK42D3-T ABWE MAX6313UK42D4-T ABWF MAX6313UK41D1-T ABWG MAX6313UK41D2-TABWHDEVICECODE DEVICECODE DEVICECODE DEVICECODE MAX6313UK33D4-T ABXP MAX6313UK32D1-T ABXQ MAX6313UK32D2-T ABXR MAX6313UK32D3-T ABXS MAX6313UK32D4-T ABXT MAX6313UK31D1-T ABXU MAX6313UK31D2-T ABXV MAX6313UK31D3-T ABXW MAX6313UK31D4-T ABXX MAX6313UK30D1-T ABXY MAX6313UK30D2-T ABXZ MAX6313UK30D3-T ABYA MAX6313UK30D4-T ABYB MAX6313UK29D1-T ABYC MAX6313UK29D2-T ABYD MAX6313UK29D3-T ABYE MAX6313UK29D4-T ABYF MAX6313UK28D1-T ABYG MAX6313UK28D2-T ABYH MAX6313UK28D3-T ABYI MAX6313UK28D4-T ABYJ MAX6313UK27D1-T ABYK MAX6313UK27D2-T ABYL MAX6313UK27D3-T ABYM MAX6313UK27D4-T ABYN MAX6313UK26D1-T ABYO MAX6313UK26D2-T ABYP MAX6313UK26D3-T ABYQ MAX6313UK26D4-T ABYR MAX6313UK25D1-T ABYS MAX6313UK25D2-T ABYT MAX6313UK25D3-T ABYU MAX6313UK25D4-TABYVMAX6313UK41D3-T ABWI MAX6313UK41D4-T ABWJ MAX6313UK40D1-T ABWK MAX6313UK40D2-T ABWL MAX6313UK40D3-T ABWM MAX6313UK40D4-T ABWN MAX6313UK39D1-T ABWO MAX6313UK39D2-T ABWP MAX6313UK39D3-T ABWQ MAX6313UK39D4-T ABWR MAX6313UK38D1-T ABWS MAX6313UK38D2-T ABWT MAX6313UK38D3-T ABWU MAX6313UK38D4-T ABWV MAX6313UK37D1-T ABWW MAX6313UK37D2-T ABWX MAX6313UK37D3-T ABWY MAX6313UK37D4-T ABWZ MAX6313UK36D1-T ABXA MAX6313UK36D2-T ABXB MAX6313UK36D3-T ABXC MAX6313UK36D4-T ABXD MAX6313UK35D1-T ABXE MAX6313UK35D2-T ABXF MAX6313UK35D3-T ABXG MAX6313UK35D4-T ABXH MAX6313UK34D1-T ABXI MAX6313UK34D2-T ABXJ MAX6313UK34D3-T ABXK MAX6313UK34D4-T ABXL MAX6313UK33D1-T ABXM MAX6313UK33D2-T ABXN MAX6313UK33D3-TABXOMAX6312UK31D1-T ABTU MAX6312UK31D2-T ABTV MAX6312UK31D3-T ABTW MAX6312UK31D4-T ABTX MAX6312UK30D1-T ABTY MAX6312UK30D2-T ABTZ MAX6312UK30D3-T ABUA MAX6312UK30D4-T ABUB MAX6312UK29D1-T ABUC MAX6312UK29D2-T ABUD MAX6312UK29D3-T ABUE MAX6312UK29D4-T ABUF MAX6312UK28D1-T ABUG MAX6312UK28D2-T ABUH MAX6312UK28D3-T ABUI MAX6312UK28D4-T ABUJ MAX6312UK27D1-T ABUK MAX6312UK27D2-T ABUL MAX6312UK27D3-T ABUM MAX6312UK27D4-T ABUN MAX6312UK26D1-T ABUO MAX6312UK26D2-T ABUP MAX6312UK26D3-T ABUQ MAX6312UK26D4-T ABUR MAX6312UK25D1-T ABUS MAX6312UK25D2-T ABUT MAX6312UK25D3-T ABUU MAX6312UK25D4-T ABUV MAX6313UK50D1-T ABUW MAX6313UK50D2-T ABUX MAX6313UK50D3-T ABUY MAX6313UK50D4-T ABUZ MAX6313UK49D1-TABVA。

参考手册NDXS和ND5XS网络音频播放器中文-NaimAudio

2.10.1 有线网络连接 NDX/5XS在其后面板安装了标准以太网接口。为了有线网络连接，在你的网络路由器上此接口应可以连接一个备用的以太网接口。
注意: 可以使用以太网供电硬件，其提供了有线家庭网络连接的简便方法。不过，根据每个家庭环境的电源配线因素，电源的网络数据可能会影响整个系统的音响质量。如果受到影响的音响质量令人无法接受，则应安装专用网络布线或应采用无线网络。
2.10 网络连接
4
5.5 存储电台预设
18
2.11 系统自动化
5
5.6 利用收音机预设
18
2.12 外部控制和更新
5
2.13 信号接地开关
5
6 NDX/5XS通用即插即用™音频接口
19
6.1 通用即插即用™服务器
19
3 NDX/5XS操作
6
6.2 音频文件的兼容性
19
3.1 前面板特点
6
6.3 扫描服务器和播放文件
21
3.8 n-Stream控制应用程序
9
iPod和iPhone是苹果公司在美国和其他国家注册的商标。 Windows媒体™ 是微软公司的商标。 UPnP™是UPnP™社区的商标。
NDX/5XS简介
1 NDX/5XS简介
NDX和ND5 XS（NDX/5XS）是能效非常高的网络和数字音频播放器，您花费在安装和设置上的时间和精力将会得到回报。我们强烈建议您阅读本手册。
NDX/5XS有效地整合了四个不同的的音频元件，其中每一个均接入用于连接到相关前置扩音器输入的模拟或数字输出。每一个元件均将在下面的段落中予以介绍，并依次在第5节到第8节中详细描述。各元件如下：
多模式收音机通用即插即用™音频接口 USB音频接口数模转换器

MAX6425UK26-T中文资料

General DescriptionThe MAX6340/MAX6421–MAX6426 low-power micro-processor supervisor circuits monitor system voltages from 1.6V to 5V. These devices perform a single function:they assert a reset signal whenever the V CC supply volt-age falls below its reset threshold. The reset output remains asserted for the reset timeout period after V CC rises above the reset threshold. The reset timeout is exter-nally set by a capacitor to provide more flexibility.The MAX6421/MAX6424 have an active-low, push-pull reset output. The MAX6422 has an active-high,push-pull reset output and the MAX6340/MAX6423/MAX6425/MAX6426 have an active-low, open-drain reset output. The MAX6421/MAX6422/MAX6423 are offered in 4-pin SC70 or SOT143 packages. The MAX6340/MAX6424/MAX6425/MAX6426 are available in 5-pin SOT23-5 packages.ApplicationsPortable EquipmentBattery-Powered Computers/Controllers Automotive Medical Equipment Intelligent Instruments Embedded Controllers Critical µP Monitoring Set-Top Boxes ComputersFeatureso Monitor System Voltages from 1.6V to 5V o Capacitor-Adjustable Reset Timeout Period o Low Quiescent Current (1.6µA typ)o Three RESET Output OptionsPush-Pull RESET Push-Pull RESET Open-Drain RESET o Guaranteed Reset Valid to V CC = 1V o Immune to Short V CC Transientso Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23Packages o MAX6340 Pin Compatible with LP3470o MAX6424/MAX6425 Pin Compatible with NCP300–NCP303, MC33464/MC33465,S807/S808/S809, and RN5VD o MAX6426 Pin Compatible with PST92XXMAX6340/MAX6421–MAX6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay________________________________________________________________Maxim Integrated Products1Ordering InformationPin Configurations19-2440; Rev 2; 10/02For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.Note: The MAX6340/MAX6421–MAX6426 are available with fac-tory-trimmed reset thresholds from 1.575V to 5.0V in approxi-mately 0.1V increments. Insert the desired nominal reset threshold suffix (from Table 1) into the blanks. There are 50 stan-dard versions with a required order increment of 2500 pieces.Sample stock is generally held on standard versions only (see Standard Versions Table). Required order increment is 10,000pieces for nonstandard versions. Contact factory for availability.All devices are available in tape-and-reel only.M A X 6340/M A X 6421–M A X 6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay2_______________________________________________________________________________________ABSOLUTE 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.All Voltages Referenced to GNDV CC ........................................................................-0.3V to +6.0V SRT, RESET , RESET (push-pull).................-0.3V to (V CC + 0.3V)RESET (open drain)...............................................-0.3V to +6.0V Input Current (all pins)......................................................±20mA Output Current (RESET , RESET)......................................±20mAContinuous Power Dissipation (T A = +70°C)4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW 4-Pin SOT143 (derate 4mW/°C above +70°C).............320mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°CMAX6340/MAX6421–MAX6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay_______________________________________________________________________________________300.51.01.52.02.53.03.54.00213456SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )0.1110010100010,0000.0010.10.011101001000RESET TIMEOUT PERIOD vs. C SRTM A X 6421/26 t o c 02C SRT (nF)R E S E T T I M E O U T P E R I O D(m s )4.104.204.154.254.30-50-25255075100125RESET TIMEOUT PERIOD vs. TEMPERATURETEMPERATURE (°C)R E S E T T I M E O U T P E R I O D (m s )RESET TIMEOUT PERIOD vs. TEMPERATURE200250350300500550450400600R E S E T T I M E O U T P E R I O D (µs )-5025-255075100125TEMPERATURE (°C)050251007515012517504002006008001000MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVERESET THRESHOLD OVERDRIVE (mV)T R A N S I E N T D U R A T I O N (µs )V CCTO RESET DELAYvs. TEMPERATURE (V CC FALLING)8090110100140150130120160V C C T O R E S E T D E L A Y (µs )-5025-255075100125TEMPERATURE (°C)POWER-UP/POWER-DOWNCHARACTERISTIC1V/div1V/div400µs/div0.9940.9980.9961.0021.0001.0041.006-502550-25075100125NORMALIZED RESET THRESHOLDvs. TEMPERATUREM A X 6421/26 t o c 08TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L DTypical Operating Characteristics(V CC = 5V, C SRT = 1500pF, T A = +25°C, unless otherwise noted.)M A X 6340/M A X 6421–M A X 6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay4_______________________________________________________________________________________Detailed DescriptionReset OutputThe reset output is typically connected to the reset input of a µP. A µP ’s reset input starts or restarts the µP in a known state. The MAX6340/MAX6421–MAX6426 µP supervisory circuits provide the reset logic to prevent code-execution errors during power-up, power-down,and brownout conditions (see Typical Operating Characteristics ).RESET changes from high to low whenever V CC drops below the threshold voltage. Once V CC exceeds the threshold voltage, RESET remains low for the capacitor-adjustable reset timeout period.The MAX6422 active-high RESET output is the inverse logic of the active-low RESET output. All device outputs are guaranteed valid for V CC > 1V.The MAX6340/MAX6423/MAX6425/MAX6426 are open-drain RESET outputs. Connect an external pullup resis-tor to any supply from 0 to 5.5V. Select a resistor value large enough to register a logic low when RESET is asserted and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k Ωto 100k Ωpullup is sufficient in most applications.Selecting a Reset CapacitorThe reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period (t RP ) by connecting a capacitor (C SRT ) between SRT and ground. Calculate the reset timeout capacitor as follows:RESET Output Allows Use with Multiple SuppliesMAX6340/MAX6421–MAX6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay_______________________________________________________________________________________5C SRT = (t RP - 275µs) / (2.73 ✕106)where t RP is in seconds and C SRT is in farads.The reset delay time is set by a current/capacitor-con-trolled ramp compared to an internal 0.65V reference.An internal 240nA ramp current source charges the external capacitor. The charge to the capacitor is cleared when a reset condition is detected. Once the reset condition is removed, the voltage on the capacitor ramps according to the formula: dV/dt = I/C. The C SRT capacitor must ramp to 0.65V to deassert the reset.C SRT must be a low-leakage (<10nA) type capacitor;ceramic is recommended.Operating as a Voltage DetectorThe MAX6340/MAX6421–MAX6426 can be operated in a voltage detector mode by floating the SRT pin. The reset delay times for V CC rising above or falling below the threshold are not significantly different. The reset output is deasserted smoothly without false pulses.Applications InformationInterfacing to Other Voltages for LogicCompatibilityThe open-drain outputs of the MAX6340/MAX6423/MAX6425/MAX6426 can be used to interface to µPs with other logic levels. As shown in Figure 1, the open-drain output can be connected to voltages from 0 to 5.5V. This allows for easy logic compatibility to various µPs.Wired-OR ResetTo allow auxiliary circuitry to hold the system in reset,an external open-drain logic signal can be connected to the open-drain RESET of the MAX6340/MAX6423/MAX6425/MAX6426, as shown in Figure 2. This config-uration can reset the µP, but does not provide the reset timeout when the external logic signal is released.Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these supervisors are relatively immune to short-duration negative-going transients (glitches). The graph Maximum Transient Duration vs. Reset Threshold Overdrive in the Typical Operating Characteristics shows this relationship.The area below the curve of the graph is the region in which these devices typically do not generate a reset pulse. This graph was generated using a negative-going pulse applied to V CC , starting above the actual reset threshold (V TH ) and ending below it by the magni-tude indicated (reset-threshold overdrive). As the mag-nitude of the transient decreases (farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a V CC transient that goes 100mV below the reset threshold and lasts 50µs or less does not cause a reset pulse to be issued.Ensuring a Valid RESET or RESETDown to V CC = 0When V CC falls below 1V, RESET /RESET current-sink-ing (sourcing) capabilities decline drastically. In the case of the MAX6421/MAX6424, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problems in most applications, since most µPs and other circuitry do not operate with V CC below 1V.In those applications where RESET must be valid down to zero, adding a pulldown resistor between RESET and ground sinks any stray leakage currents, holding RESET low (Figure 3). The value of the pulldown resis-tor is not critical; 100k Ωis large enough not to load RESET and small enough to pull RESET to ground. For applications using the MAX6422, a 100k Ωpullup resis-M A X 6340/M A X 6421–M A X 6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay6_______________________________________________________________________________________tor between RESET and V CC holds RESET high when V CC falls below 1V (F igure 4). Open-drain RESET ver-sions are not recommended for applications requiring valid logic for V CC down to zero.Layout ConsiderationSRT is a precise current source. When developing the layout for the application, be careful to minimize board capacitance and leakage currents around this pin.Traces connected to SRT should be kept as short as possible. Traces carrying high-speed digital signals and traces with large voltage potentials should be rout-ed as far from SRT as possible. Leakage current and stray capacitance (e.g., a scope probe) at this pin could cause errors in the reset timeout period. When evaluating these parts, use clean prototype boards to ensure accurate reset periods.Figure 3. Ensuring RESET Valid to V CC= 0CCMAX6340/MAX6421–MAX6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay7factory for availability of nonstandard versions.Typical Operating CircuitM A X 6340/M A X 6421–M A X 6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay8_______________________________________________________________________________________Pin Configurations (continued)Chip InformationTRANSISTOR COUNT: 295PROCESS: BiCMOSMAX6340/MAX6421–MAX6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay_______________________________________________________________________________________9Package 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 .)M A X 6340/M A X 6421–M A X 6426Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout DelayMaxim 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.10____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2002 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。

MAX713中文资料

BATTERY MANAGEMENT Jul 09, 1998 Switch-Mode Battery Charger Delivers 5AThe fast-charge controller IC3 (Figure 1) normally directs current to the battery via an external pnp transistor. In this circuit, the transistor is replaced with a 5A switching regulator (IC1) that delivers equivalent power with higher efficiency.Figure 1. By controlling the PWM duty cycle of switching regulator IC1, the fast-charge controller (IC3) makes efficient delivery of the battery's charging current.IC1 is a 5A buck switching regulator whose output is configured as a current source. Its internal power switch (an npn transistor) is relatively efficient because V CE(SAT) is small in comparison with the 15V-to-40V inputs. (For applications that require 2A or less, the low-saturation, non-Darlington power switch of a MAX726 offers better efficiency.)R6 senses the battery-charging current and enables IC3 to generate an analog drive signal at DRV. The signal is first attenuated by the op amp to assure stability by reducing gain in the control loop. It then drives IC1's compensation pin (VC), which gives direct access to the internal PWM comparator. IC3 thus controls the charging current via the PWM duty cycle of IC1. The Q1 buffer provides current to the DRV input.Loop stability is also determined by the feedback loop's dominant pole, set by C4 at the CC terminal of IC3. If you increase the value of the battery filter capacitor (C5), you should make a proportional increase in the value of C4. Lower values, however, assure good transient response. If your application produces load transients during the fast-charge cycle, check the worst-case response to a load step. To assure proper termination of the charge, battery voltage should settle within 2msec to 5mV times N (where N is the number of battery cells). More InformationMAX713:QuickView-- Full (PDF) Data Sheet-- Free Samples。

iDiskk Max 2022-08-001 iPhone iPad Flash Drives 双端

USER GUIDE iDiskk Max Version:2022-08-001iPhone/iPad Flash Drives⏹Introduction for USB flash drive2in1USB flash drive3/4in1USB flash drive Ports:Lightning+USB3.0connector Lightning+USB3.0+USB C+Micro USBCompatibility:iPhone13/13pro/13pro max/12/12pro/12pro max/11/pro,X/XR/XS/XS/Max5/6/7/8,iPadair,iPad mini,iPad,Macbook(only USB port),computer iPhone13/13pro/13pro max/12/12pro/12pro max/11/pro,X/XR/XS/XS/Max5/6/7/8, Macbook(only USB port),computer,iPadair,iPad mini,iPad,Mac book,computer,Android devices.Storage volume:32/64/128/256G128/256G Apple certified:YES YESMain features:✓Automatic Photo Backup✓Plug and play(watch moviesdirectly from the flash drive)✓Watch your Videos on the Move✓USB3.0High-Speed Transfers✓Works with Most Cases ✓Automatic Photo Backup✓Plug and play(watch movies directlyfrom the flash drive)✓Watch your Videos on the Move✓USB3.0High-Speed Transfers✓Works with Most Cases✓Work with Android devicesContentsFirst use(access settings)....................................................................................................1-3 APP overview.................................................................................................................4-6 Backup Section:(One-tap backup all photos/videos)：. (7)Back Up Settlngs (8)Share single document(PDF,EXCEL,PPT etc)to the hard drive.........................................9-10◆Photos Section:Copy photos........................................................................................................11-15 Organize photos (16)Rename photos....................................................................................................17-18 Share photos........................................................................................................19-20◆Videos Section:Copy videos...........................................................................................................21-25 Organize videos.. (26)Rename videos (27)Share videos...........................................................................................................28-30◆Camera Section:T ake photos/videos and automatic backup to the flash drive Take photos...........................................................................................................31-32 Take videos...........................................................................................................33-34◆File/folder Section:Copy folders......................................................................................................35-36 Organize folders. (37)Rename folders (38)◆Settings:Overview (39)APP encryption.................................................................................................40-43 Folder encryption...........................................................................................44-46 Format.. (47)◆Q&A........................................................................................................48-501123456“1-3”）7Click for selection Browse layout Select “iPhone ”⏹Photos Section:Copy photos1.Click into photos section:2.Select photos:select all or select one by oneCopy to the flash driveShare photos to Email/Socialmedias,BluetoothDelete selectedphotosCancelChoose “External storage”3.Copy selected photos to the flash drive:3.1:Click “Copy to ”3.2:Click“Create folder”3.3:Click“Paste”Organize photosyou can go back to the folder to browse and organize the the photos:Photos will keep original information(data,name)andcan be organized by time,name or type as below:Rename photos1.Go to“File/Folder”section and click into the folder and click“More”:Share photos1.Select photos and then click icon“Share”Max quantity for photos sharing will vary by different third-party media(Facebook,Email,Instagram etc)Click for selection Browse layout Select “iPhone ”⏹Videos Section:Copy videos1.Click into Videossection:1.Select videos:select all or select one by oneDelete selectedphotos CancelCopy to the flash drive Share photos to Email/Social medias,BluetoothChoose “External storage”2.Copy selected videos to the flash drive:3.1:Click “Copy to ”3.2:Click“Create folder”3.3:Click“Paste”Organize videosyou can go back to the folder to browse and organize the the videos:Photos will keep original information(data,name)andcan be organized by time,name or type as below:Rename videosGo to“File/Folder”section and click into the folder and click“More”:Share videosSelect videos and then click icon“Share”Max quantity for photos sharing will vary by different third-party media(Facebook,Email,Instagram etc)⏹Camera Section:Take photos/videos and automatic backup to the flash drive Take photosThe photos will be automatically stored to the flash drive(iDiskk Max),you can go to “Photo”section to browse,when you try to manage them on your PC,please find the folder named as“Camera”.Take videos:The videos will be automatically stored to the flash drive(iDiskk Max),you can go to “Videos”section to browse.When you try to manage them on your PC,please find the folder named as“Camera”.1122123⏹File/folder Section:all folders can be managed here Copy folders:Transfer successfully Transfer successfullyOrganize folders:Rename folders:Settings:Password/touch ID settings/format/Back up Overview⏹App Encryption1.1Touch(Face)ID.A touch(Face)ID is request when open the iDiskk Max app next time.1.2Number Password.A number is request to enter into the APP when open the iDiskk Max next time.1.3Revise number password.Can revise the number password by set a new code(Before set up a new number password,you are supposed to enter old number password first)1.4Not start Encryption.Click not start encryption,no any password is requested when enter into the app.If you forget the password,the only way is to format the iDiskk flash driveDisk Folder Encryption.Insert6-16digital or alphabetic as password to encrypt any folder.Click File/Folder,select the file you want to encrypt44A password is requested next time when open the file which is encrypted.A password is request if close folder encryption function.If you forget the password,the only way is to format the iDiskk flash drive.。

MAX6387XS26D7-T中文资料

MAX6387XS26D7-T中文资料元器件交易网19-1839; Rev 1; 04/01SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsGeneral DescriptionFeaturesThe MAX6381�CMAX6390 microprocessor (µP) supervisorycircuits monitor power supply voltages from +1.8V tooFactory-Set Reset Threshold Voltages Ranging+5.0V while consuming only 3µA of supply current atfrom +1.58V to+4.63V in Approximately 100mV+1.8V. Whenever VCCfalls below the factory-set resetIncrementsthresholds, the reset output asserts and remains assert-o±2.5% Reset Threshold Accuracy Overed for a minimum reset timeout period after VCCrisesTemperature (-40°C to +125°C)above the reset threshold. Re set thresholds are availablefrom +1.58V to +4.63V, in approximately 100mV incre-oSeven Reset Timeout Periods Available: 1ms,ments. Seven minimum reset timeout delays ranging20ms, 140ms, 280ms, 560ms, 1120ms, from 1ms to 1200ms are available.1200ms (min)The MAX6381/MAX6384/MAX6387 have a push-pullo3 Reset Output Optionsactive-low reset output. The MAX6382/MAX6385/Active-Low Push-PullMAX6388 have a push-pull active-high reset output,Active-High Push-Pulland theMAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. TheActive-Low Open-DrainMAX6384/MAX6385/MAX6386 also feature aoReset Output State Guaranteed Valid debounced manual reset input (with internal pullupDown to VCC= 1Vresistor). The MAX6387/MAX6388/MAX6389 have anauxiliary input for monitoring a second voltage. TheoManual Reset Input(MAX6384/MAX6385/MAX6386)MAX6390 offers a manual reset input with a longer VoAuxiliary RESETINreset timeout period (1120ms or 1200ms) and ashorterCC(MAX6387/MAX6388/MAX6389)manual reset timeout (140ms or 150ms).oVCCReset Timeout (1120ms or 1200ms)/ManualThe MAX6381/MAX6382/MAX6383 are available in 3-pinReset Timeout (140ms or 150ms) (MAX6390)SC70 packages and the MAX6384�CMAX6390 are avail-able in 4-pin SC70 packages.oNegative-Going VCCTransient Immunity________________________ApplicationsoLow Power Consumption of 6µA at +3.6V and 3µA at +1.8VComputersoPin Compatible withControllersMAX809/MAX810/MAX803/MAX6326/MAX6327/Intelligent InstrumentsMAX6328/MAX6346/MAX6347/MAX6348, Critical µP and µC Power Monitoringand MAX6711/MAX6712/MAX6713Portable/Battery-Powered EquipmentoTiny 3-Pin SC70 and 4-Pin SC70 PackagesDual Voltage SystemsPin ConfigurationsNote:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". Insert reset timeout delay (see Reset TimeoutDelay table) after "D" to complete the part number. Samplestock is generally held on standard versions only (seeStandard Versions table). Standard versions have an orderincrement requirement of 2500 pieces. Nonstandard versionshave an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.Ordering Information continuedat end of data sheet.Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.________________________________________________________________Maxim Integrated Products1For pricing, delivery, and ordering information,please contactMaxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .MAX6381�CMAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381�CMAX6390ABSOLUTE MAXIMUM RATINGSVCC to GND..........................................................-0.3Vto +6.0VRESETOpen-Drain Output....................................-0.3V to+6.0VRESET, RESET (Push-Pull Output).............-0.3V to (VCC+ 0.3V)MR, RESET IN.............................................-0.3V to (VCC+ 0.3V)Input Current (VCC).............................................................20mAOutput Current (All Pins).....................................................20mAContinuous Power Dissip ation (TA= +70°C)3-Pin SC70 (derate 2.9mW/°C above +70°C)........235mW4-Pin SC70 (derate 3.1mW/°C above +70°C)........245mWOperating Temperature Range.........................-40°C to +125°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°CStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyondthose indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periodsmay affect device reliability.ELECTRICAL CHARACTERISTICSSC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________3MAX6381�CMAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381�CMAX6390Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)SUPPLY CURRENT vs. TEMPERATURE(NO LOAD)POWER-DOWN RESET DELAYvs. TEMPERATURENORMALIZED RESET TIMEOUT PERIOD8SUPPLY CURRENT (µA)7654321041POWER-DOWN RESET DELAY (µs)393735333129271.061.041.021.000.980.960.94-40-25-105203550658095110125TEMPERATURE (°C)25-40-25-105203550658095110125TEMPERATURE (°C)-40-25-105203550658095110125TEMPERATURE (°C)NORMALIZED RESET THRESHOLDvs. TEMPERATUREMAX6381/90 toc04OUTPUT VOLTAGE LOWvs. SINK CURRENTOUTPUT VOLTAGE HIGHvs. SOURCE CURRENT1.020NORMALIZED RESETTHRESHOLD1.0151.0101.0051.0000.9950.9900.985 1.21.00.8VOL (V)0.60.40.20036ISINK (mA)93.02.52.0VOH (V)1.51.00.500250500750100012500.990-40-25-105203550658095110125TEMPERATURE (°C)121500ISOURCE (µA)MAXIMUM TRANSIENT DURATIONvs. RESET COMPARATOR OVERDRIVERESET IN TO RESET DELAYvs. TEMPERATURE5.35.1RESET IN DELAY (µs)4.94.74.54.34.13.93.73.5MAX6381/90 toc08500MAXIMUM TRANSIENT DURATION (µs)450400350300250200150100501101005.51000-40-25-105203550658095110125TEMPERATURE (°C)RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)4_____________________________________________________________________________ _________MAX6381/90 toc039NORMALIZED POWER-UP RESET TIMEOUTvs. TEMPERATURE1.0843SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits______________________________________________________________________________ _________5MAX6381�CMAX6390SC70, Single/Dual Low-Voltage, Low-Power µP ResetCircuitsMAX6381�CMAX6390Detailed DescriptionRESET OutputA µP reset input starts the µP in a known state. TheseµP supervisory circuits assert reset to prevent codeexecution errors during power-up, power-down, orbrownout conditions.Reset asserts when VCCis below the reset threshold;once VCCexceeds the reset threshold, an internal timerkeeps the reset output asserted for the reset timeoutperiod. After this interval, reset output deasserts. Resetoutput is guaranteed to be in the correct logic state forVCC≥1V.Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390)Man y µP-based products require manual reset capabil-ity, allowing the operator, a test technician, or externallogic circuitry to initiate a reset. A logic low on MRasserts reset. Reset remains asserted while MRis low,and for the reset active timeout period (tRP) after MRreturns high. This input has an internal 63k pullupresistor (1.35k for MAX6390), so it can be left uncon-nected if it is not used. MRcan be driven with TTL orCMOS logic levels, or with open-drain/collector outputs.Connect a normally open momentary switch from MRtoGND to create a manual-reset function; externaldebounce circuitry is not required. If MRis driven fromlong cables or if the device is used in anoisy environ-ment, connecting a 0.1µF capacitor from MRto GNDprovides additional noise immunity.RESET IN Comparator(MAX6387/MAX6388/MAX6389)RESET IN is compared to an internal +1.27V reference.If the voltage at RESET IN is less than 1.27V, resetasserts. Use the RESET IN comparator as a user-adjustable reset detector or as a secondary power-sup-ply monitor by implementing a resistor-divider at RESETIN (shown in Figure 1). Reset asserts when either VCCor RESET IN falls below its respective threshold volt-age. Use the following equation to set the threshold:VINTH= VTHRST (R1/R2 + 1)where VTHRST= +1.27V. To simplify the resistor selec-tion, choose a value of R2 and calculate R1:R1 = R2 [(VINTH/VTHRST) - 1]Since the input current at RESET IN is 50nA (max),large values can be used for R2 with no significant lossin accuracy.___________Applications InformationIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, theMAX6381�CMAX6390 are relatively immune to short dura-tion negative-going VCCtransients (glitches).The Typical Operating Characteristicssection shows theMaximum Transient Durations vs. Reset ComparatorOverdrive, for which the MAX6381�CMAX6390 do notgenerate a reset pulse. This graph was generated usingNegative-Going VCCTransients6_____________________________________________________________________________ __________SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsMAX6381�CMAX6390not work with the open-drain outputs of theMAX6383/MAX6386/MAX6389/MAX6390. The resistorvalue used is not critical, but it must be small enoughnot to load the reset output when VCCis above the resetthreshold. For most applications, 100k is adequate.a negative-going pulse applied to VCC, starting above theactual reset threshold and ending below it by the magni-tude indicated (reset comparator overdrive). The graphindicates the typical maximum pulse width a negative-going VCCtransient may have without causing a resetpulse to be issued. As the magnitude of the transientincreases (goes farther below the reset threshold), themaximum allowable pulse width decreases. A 0.1µFcapacitor mounted as close as possible to VCCprovidesadditional transient immunity.The MAX6381�CMAX6390 are guaranteed to operateproperly down to VCC= 1V.In applications that requirevalid reset levels down to VCC= 0, a pulldown resistor toactive-low outputs (push/pull only, Figure 2) and apullup resistorto active-high outputs (push/pull only) willensure that the reset line isvalid while the reset outputcan no longer sink or source current. This scheme doesEnsuring a Valid RESETOutput Down to VCC= 0_______________________________________________________________________________________7SC70, Single/Dual Low-Voltage, Low-Power µP ResetCircuitsMAX6381�CMAX6390Pin Configurations (continued)*MRis for MAX6384/MAX6385/MAX6386/MAX6390**RESET IN is forMAX6387/MAX6388/MAX6389( ) are for MAX6382/MAX6385/MAX6388Chip InformationTRANSISTOR COUNT: 647PROCESS: BiCMOSSC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsOrdering InformationNote:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". Insert reset timeout delay (see Reset TimeoutDelay table) after "D" to complete the part number. Samplestock is generally held on standard versions only (seeStandard Versions table). Standard versions have an orderincrement requirement of 2500 pieces. Nonstandard versionshave an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.______________________________________________________________________________ _________9MAX6381�CMAX6390SC70, Single/Dual Low-Voltage, Low-Power µP ResetCircuitsMAX6381�CMAX6390Package Information10____________________________________________________________________________ __________SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsPackage Information (continued)Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600____________________11©2001 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.MAX6381�CMAX6390感谢您的阅读，祝您生活愉快。

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。

MAX706中文简介

功能监控器MAX705/706/813中文资料。

概述MAX705/706/813L是一组CMOS监控电路，能够监控电源电压、电池故障和微处理器(MPU或mP)或微控制器(MCU或mC)的工作状态。

将常用的多项功能集成到一片8脚封装的小芯片内，与采用分立元件或单一功能芯片组合的电路相比，大大减小了系统电路的复杂性和元器件的数量，显著提高了系统可靠性和精确度。

该系列产品采用3种不同的8脚封装形式：DIP、SO和mMAX。

主要应用于：微处理器和微控制器系统；嵌入式控制器系统；电池供电系统；智能仪器仪表；通信系统；寻呼机；蜂窝移动电话机；手持设备；个人数字助理(PDA)；电脑电话机和无绳电话机等等。

功能说明RESET/RESET操作复位信号用于启动或者重新启动MPU/MCU，令其进入或者返回到预知的循环程序并顺序执行。

一旦MPU/MCU处于未知状态，比如程序“跑飞”或进入死循环，就需要将系统复位。

对于MAX705和MAX706而言，在上电期间只要Vcc大于1.0V，就能保证输出电压不高于0.4V 的低电平。

在Vcc上升期间RESET维持低电平直到电源电压升至复位门限(4.65V或4.40V)以上。

在超过此门限后，内部定时器大约再维持200ms后释放RESET，使其返回高电平。

无论何时只要电源电压降低到复位门限以下(即电源跌落)，RESET引脚就会变低。

如果在已经开始的复位脉冲期间出现电源跌落，复位脉冲至少再维持140ms。

在掉电期间，一旦电源电压Vcc 降到复位门限以下，只要Vcc不比1.0V还低，就能使RESET维持电压不高于0.4V的低电平。

MAX705和MAX706提供的复位信号为低电平RESET，而MAX813L提供的复位信号为高电平RESET，三者其它功能完全相同。

有些单片机，如INTEL的80C51系列，需要高电平有效的复位信号。

看门狗定时器MAX705/706/813L片内看门狗定时器用于监控MPU/MCU的活动。

MAX247中文资料

General DescriptionThe MAX220–MAX249 family of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communica-tions interfaces, particularly applications where ±12V is not available.These parts are especially useful in battery-powered sys-tems, since their low-power shutdown mode reduces power dissipation to less than 5µW. The MAX225,MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components and are recommended for appli-cations where printed circuit board space is critical.________________________ApplicationsPortable Computers Low-Power Modems Interface TranslationBattery-Powered RS-232 Systems Multidrop RS-232 Networks____________________________Features Superior to Bipolaro Operate from Single +5V Power Supply (+5V and +12V—MAX231/MAX239)o Low-Power Receive Mode in Shutdown (MAX223/MAX242)o Meet All EIA/TIA-232E and V.28 Specifications o Multiple Drivers and Receiverso 3-State Driver and Receiver Outputs o Open-Line Detection (MAX243)Ordering InformationOrdering Information continued at end of data sheet.*Contact factory for dice specifications.MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers________________________________________________________________Maxim Integrated Products 1Selection Table19-4323; Rev 9; 4/00Power No. of NominalSHDN RxPart Supply RS-232No. of Cap. Value & Three-Active in Data Rate Number (V)Drivers/Rx Ext. Caps (µF)State SHDN (kbps)FeaturesMAX220+52/24 4.7/10No —120Ultra-low-power, industry-standard pinout MAX222+52/2 4 0.1Yes —200Low-power shutdownMAX223 (MAX213)+54/54 1.0 (0.1)Yes ✔120MAX241 and receivers active in shutdown MAX225+55/50—Yes ✔120Available in SOMAX230 (MAX200)+55/04 1.0 (0.1)Yes —120 5 drivers with shutdownMAX231 (MAX201)+5 and2/2 2 1.0 (0.1)No —120Standard +5/+12V or battery supplies; +7.5 to +13.2same functions as MAX232MAX232 (MAX202)+52/24 1.0 (0.1)No —120 (64)Industry standardMAX232A+52/240.1No —200Higher slew rate, small caps MAX233 (MAX203)+52/20— No —120No external capsMAX233A+52/20—No —200No external caps, high slew rate MAX234 (MAX204)+54/04 1.0 (0.1)No —120Replaces 1488MAX235 (MAX205)+55/50—Yes —120No external capsMAX236 (MAX206)+54/34 1.0 (0.1)Yes —120Shutdown, three stateMAX237 (MAX207)+55/34 1.0 (0.1)No —120Complements IBM PC serial port MAX238 (MAX208)+54/44 1.0 (0.1)No —120Replaces 1488 and 1489MAX239 (MAX209)+5 and3/52 1.0 (0.1)No —120Standard +5/+12V or battery supplies;+7.5 to +13.2single-package solution for IBM PC serial port MAX240+55/54 1.0Yes —120DIP or flatpack package MAX241 (MAX211)+54/54 1.0 (0.1)Yes —120Complete IBM PC serial port MAX242+52/240.1Yes ✔200Separate shutdown and enableMAX243+52/240.1No —200Open-line detection simplifies cabling MAX244+58/104 1.0No —120High slew rateMAX245+58/100—Yes ✔120High slew rate, int. caps, two shutdown modes MAX246+58/100—Yes ✔120High slew rate, int. caps, three shutdown modes MAX247+58/90—Yes ✔120High slew rate, int. caps, nine operating modes MAX248+58/84 1.0Yes ✔120High slew rate, selective half-chip enables MAX249+56/1041.0Yes✔120Available in quad flatpack packageFor free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/ReceiversABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243(V CC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T A = T MIN to T MAX ‚ unless otherwise noted.)Note 1:Input voltage measured with T OUT in high-impedance state, SHDN or V CC = 0V.Note 2:For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.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.Supply Voltage (V CC )...............................................-0.3V to +6V Input VoltagesT IN ..............................................................-0.3V to (V CC - 0.3V)R IN (Except MAX220)........................................................±30V R IN (MAX220).....................................................................±25V T OUT (Except MAX220) (Note 1).......................................±15V T OUT (MAX220)...............................................................±13.2V Output VoltagesT OUT ...................................................................................±15V R OUT .........................................................-0.3V to (V CC + 0.3V)Driver/Receiver Output Short Circuited to GND.........Continuous Continuous Power Dissipation (T A = +70°C)16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW20-Pin Plastic DIP (derate 8.00mW/°C above +70°C)..440mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)...696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW Operating Temperature RangesMAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C MAX2_ _AE_ _, MAX2_ _E_ _..........................-40°C to +85°C MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________3Note 3:MAX243 R2OUT is guaranteed to be low when R2IN is ≥0V or is floating.ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)(V= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T = T to T ‚ unless otherwise noted.)M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 4_________________________________________________________________________________________________________________________________Typical Operating CharacteristicsMAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243108-1051525OUTPUT VOLTAGE vs. LOAD CURRENT-4-6-8-2642LOAD CURRENT (mA)O U T P U T V O L T A G E (V )1002011104104060AVAILABLE OUTPUT CURRENTvs. DATA RATE65798DATA RATE (kbits/sec)O U T P U T C U R R E N T (m A )203050+10V-10VMAX222/MAX242ON-TIME EXITING SHUTDOWN+5V +5V 0V0V 500µs/div V +, V - V O L T A G E (V )MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________5V CC ...........................................................................-0.3V to +6V V+................................................................(V CC - 0.3V) to +14V V-............................................................................+0.3V to -14V Input VoltagesT IN ............................................................-0.3V to (V CC + 0.3V)R IN ......................................................................................±30V Output VoltagesT OUT ...................................................(V+ + 0.3V) to (V- - 0.3V)R OUT .........................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T OUT ......................................Continuous Continuous Power Dissipation (T A = +70°C)14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 24-Pin Narrow Plastic DIP(derate 13.33mW/°C above +70°C)..........1.07W24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW20-Pin Wide SO (derate 10 00mW/°C above +70°C).......800mW 24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W 44-Pin Plastic FP (derate 11.11mW/°C above +70°C).....889mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C)..........727mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C)........800mW 20-Pin CERDIP (derate 11.11mW/°C above +70°C)........889mW 24-Pin Narrow CERDIP(derate 12.50mW/°C above +70°C)..............1W24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W 28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW Operating Temperature RangesMAX2 _ _ C _ _......................................................0°C to +70°C MAX2 _ _ E _ _...................................................-40°C to +85°C MAX2 _ _ M _ _ ...............................................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; 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.M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 6_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________78.56.54.55.5TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. V CC7.08.0V CC (V)V O H (V )5.07.57.46.02500TRANSMITTER OUTPUT VOLTAGE (V OH )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.46.27.27.0LOAD CAPACITANCE (pF)V O H (V )1500100050020006.86.612.04.02500TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE6.05.011.09.010.0LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )1500100050020008.07.0-6.0-9.04.55.5TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. V CC-8.0-8.5-6.5-7.0V CC (V)V O L (V )5.0-7.5-6.0-7.62500TRANSMITTER OUTPUT VOLTAGE (V OL )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES-7.0-7.2-7.4-6.2-6.4LOAD CAPACITANCE (pF)V O L (V )150010005002000-6.6-6.810-105101520253035404550TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CURRENT-2-6-4-886CURRENT (mA)V +, V - (V )420__________________________________________Typical Operating CharacteristicsMAX223/MAX230–MAX241*SHUTDOWN POLARITY IS REVERSED FOR NON MAX241 PARTSV+, V- WHEN EXITING SHUTDOWN(1µF CAPACITORS)MAX220-13SHDN*V-O V+500ms/divM A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 8_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX ; unless oth-erwise noted.)Note 4:Input voltage measured with transmitter output in a high-impedance state, shutdown, or V CC = 0V.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.Supply Voltage (V CC )...............................................-0.3V to +6V Input VoltagesT IN ‚ ENA , ENB , ENR , ENT , ENRA ,ENRB , ENTA , ENTB ..................................-0.3V to (V CC + 0.3V)R IN .....................................................................................±25V T OUT (Note 3).....................................................................±15V R OUT ........................................................-0.3V to (V CC + 0.3V)Short Circuit (one output at a time)T OUT to GND............................................................Continuous R OUT to GND............................................................ContinuousContinuous Power Dissipation (T A = +70°C)28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 40-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...611mW 44-Pin PLCC (derate 13.33mW/°C above +70°C)...........1.07W Operating Temperature RangesMAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering,10sec)..............................+300°CMAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________9Note 5:The 300Ωminimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V CC =0V is 10M Ωas is implied by the leakage specification.ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX ; unless oth-erwise noted.)M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 10________________________________________________________________________________________________________________________________Typical Operating CharacteristicsMAX225/MAX244–MAX24918212345TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE86416LOAD CAPACITANCE (nF)T R A N S M I T T E R S L E W R A T E (V /µs )14121010-105101520253035OUTPUT VOLTAGEvs. LOAD CURRENT FOR V+ AND V--2-4-6-88LOAD CURRENT (mA)O U T P U T V O L T A G E (V )64209.05.012345TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.05.58.5LOAD CAPACITANCE (nF)V +, V (V )8.07.57.06.5MAX220–MAX249Drivers/Receivers______________________________________________________________________________________11Figure 1. Transmitter Propagation-Delay Timing Figure 2. Receiver Propagation-Delay TimingFigure 3. Receiver-Output Enable and Disable Timing Figure 4. Transmitter-Output Disable TimingM A X 220–M A X 249Drivers/Receivers 12______________________________________________________________________________________ENT ENR OPERATION STATUS TRANSMITTERSRECEIVERS00Normal Operation All Active All Active 01Normal Operation All Active All 3-State10Shutdown All 3-State All Low-Power Receive Mode 11ShutdownAll 3-StateAll 3-StateTable 1a. MAX245 Control Pin ConfigurationsENT ENR OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All Active RA1–RA4 3-State,RA5 Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll 3-StateAll Low-Power Receive Mode All Low-Power Receive Mode 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RB5 Low-Power Receive ModeTable 1b. MAX245 Control Pin ConfigurationsTable 1c. MAX246 Control Pin ConfigurationsENA ENB OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All 3-State All Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll ActiveRA1–RA4 3-State,RA5 Active All Active 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RA5 Low-Power Receive ModeMAX220–MAX249Drivers/Receivers______________________________________________________________________________________13Table 1d. MAX247/MAX248/MAX249 Control Pin ConfigurationsM A X 220–M A X 249_______________Detailed DescriptionThe MAX220–MAX249 contain four sections: dual charge-pump DC-DC voltage converters, RS-232 dri-vers, RS-232 receivers, and receiver and transmitter enable control inputs.Dual Charge-Pump Voltage ConverterThe MAX220–MAX249 have two internal charge-pumps that convert +5V to ±10V (unloaded) for RS-232 driver operation. The first converter uses capacitor C1 to dou-ble the +5V input to +10V on C3 at the V+ output. The second converter uses capacitor C2 to invert +10V to -10V on C4 at the V- output.A small amount of power may be drawn from the +10V (V+) and -10V (V-) outputs to power external circuitry (see the Typical Operating Characteristics section),except on the MAX225 and MAX245–MAX247, where these pins are not available. V+ and V- are not regulated,so the output voltage drops with increasing load current.Do not load V+ and V- to a point that violates the mini-mum ±5V EIA/TIA-232E driver output voltage when sourcing current from V+ and V- to external circuitry. When using the shutdown feature in the MAX222,MAX225, MAX230, MAX235, MAX236, MAX240,MAX241, and MAX245–MAX249, avoid using V+ and V-to power external circuitry. When these parts are shut down, V- falls to 0V, and V+ falls to +5V. For applica-tions where a +10V external supply is applied to the V+pin (instead of using the internal charge pump to gen-erate +10V), the C1 capacitor must not be installed and the SHDN pin must be tied to V CC . This is because V+is internally connected to V CC in shutdown mode.RS-232 DriversThe typical driver output voltage swing is ±8V when loaded with a nominal 5k ΩRS-232 receiver and V CC =+5V. Output swing is guaranteed to meet the EIA/TIA-232E and V.28 specification, which calls for ±5V mini-mum driver output levels under worst-case conditions.These include a minimum 3k Ωload, V CC = +4.5V, and maximum operating temperature. Unloaded driver out-put voltage ranges from (V+ -1.3V) to (V- +0.5V). Input thresholds are both TTL and CMOS compatible.The inputs of unused drivers can be left unconnected since 400k Ωinput pull-up resistors to V CC are built in (except for the MAX220). The pull-up resistors force the outputs of unused drivers low because all drivers invert.The internal input pull-up resistors typically source 12µA,except in shutdown mode where the pull-ups are dis-abled. Driver outputs turn off and enter a high-imped-ance state—where leakage current is typically microamperes (maximum 25µA)—when in shutdownmode, in three-state mode, or when device power is removed. Outputs can be driven to ±15V. The power-supply current typically drops to 8µA in shutdown mode.The MAX220 does not have pull-up resistors to force the ouputs of the unused drivers low. Connect unused inputs to GND or V CC .The MAX239 has a receiver three-state control line, and the MAX223, MAX225, MAX235, MAX236, MAX240,and MAX241 have both a receiver three-state control line and a low-power shutdown control. Table 2 shows the effects of the shutdown control and receiver three-state control on the receiver outputs.The receiver TTL/CMOS outputs are in a high-imped-ance, three-state mode whenever the three-state enable line is high (for the MAX225/MAX235/MAX236/MAX239–MAX241), and are also high-impedance whenever the shutdown control line is high.When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1µA with the driver output pulled to ground. The driver output leakage remains less than 1µA, even if the transmitter output is backdriven between 0V and (V CC + 6V). Below -0.5V, the transmitter is diode clamped to ground with 1k Ωseries impedance. The transmitter is also zener clamped to approximately V CC + 6V, with a series impedance of 1k Ω.The driver output slew rate is limited to less than 30V/µs as required by the EIA/TIA-232E and V.28 specifica-tions. Typical slew rates are 24V/µs unloaded and 10V/µs loaded with 3Ωand 2500pF.RS-232 ReceiversEIA/TIA-232E and V.28 specifications define a voltage level greater than 3V as a logic 0, so all receivers invert.Input thresholds are set at 0.8V and 2.4V, so receivers respond to TTL level inputs as well as EIA/TIA-232E and V.28 levels.The receiver inputs withstand an input overvoltage up to ±25V and provide input terminating resistors withDrivers/Receivers 14Table 2. Three-State Control of ReceiversMAX220–MAX249Drivers/Receivers______________________________________________________________________________________15nominal 5k Ωvalues. The receivers implement Type 1interpretation of the fault conditions of V.28 and EIA/TIA-232E.The receiver input hysteresis is typically 0.5V with a guaranteed minimum of 0.2V. This produces clear out-put transitions with slow-moving input signals, even with moderate amounts of noise and ringing. The receiver propagation delay is typically 600ns and is independent of input swing direction.Low-Power Receive ModeThe low-power receive-mode feature of the MAX223,MAX242, and MAX245–MAX249 puts the IC into shut-down mode but still allows it to receive information. This is important for applications where systems are periodi-cally awakened to look for activity. Using low-power receive mode, the system can still receive a signal that will activate it on command and prepare it for communi-cation at faster data rates. This operation conserves system power.Negative Threshold—MAX243The MAX243 is pin compatible with the MAX232A, differ-ing only in that RS-232 cable fault protection is removed on one of the two receiver inputs. This means that control lines such as CTS and RTS can either be driven or left floating without interrupting communication. Different cables are not needed to interface with different pieces of equipment.The input threshold of the receiver without cable fault protection is -0.8V rather than +1.4V. Its output goes positive only if the input is connected to a control line that is actively driven negative. If not driven, it defaults to the 0 or “OK to send” state. Normally‚ the MAX243’s other receiver (+1.4V threshold) is used for the data line (TD or RD)‚ while the negative threshold receiver is con-nected to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.). Other members of the RS-232 family implement the optional cable fault protection as specified by EIA/TIA-232E specifications. This means a receiver output goes high whenever its input is driven negative‚ left floating‚or shorted to ground. The high output tells the serial communications IC to stop sending data. To avoid this‚the control lines must either be driven or connected with jumpers to an appropriate positive voltage level.Shutdown—MAX222–MAX242On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and MAX241‚ all receivers are disabled during shutdown.On the MAX223 and MAX242‚ two receivers continue to operate in a reduced power mode when the chip is in shutdown. Under these conditions‚ the propagation delay increases to about 2.5µs for a high-to-low input transition. When in shutdown, the receiver acts as a CMOS inverter with no hysteresis. The MAX223 and MAX242 also have a receiver output enable input (EN for the MAX242 and EN for the MAX223) that allows receiver output control independent of SHDN (SHDN for MAX241). With all other devices‚ SHDN (SH DN for MAX241) also disables the receiver outputs.The MAX225 provides five transmitters and five receivers‚ while the MAX245 provides ten receivers and eight transmitters. Both devices have separate receiver and transmitter-enable controls. The charge pumps turn off and the devices shut down when a logic high is applied to the ENT input. In this state, the supply cur-rent drops to less than 25µA and the receivers continue to operate in a low-power receive mode. Driver outputs enter a high-impedance state (three-state mode). On the MAX225‚ all five receivers are controlled by the ENR input. On the MAX245‚ eight of the receiver out-puts are controlled by the ENR input‚ while the remain-ing two receivers (RA5 and RB5) are always active.RA1–RA4 and RB1–RB4 are put in a three-state mode when ENR is a logic high.Receiver and Transmitter EnableControl InputsThe MAX225 and MAX245–MAX249 feature transmitter and receiver enable controls.The receivers have three modes of operation: full-speed receive (normal active)‚ three-state (disabled)‚ and low-power receive (enabled receivers continue to function at lower data rates). The receiver enable inputs control the full-speed receive and three-state modes. The transmitters have two modes of operation: full-speed transmit (normal active) and three-state (disabled). The transmitter enable inputs also control the shutdown mode. The device enters shutdown mode when all transmitters are disabled. Enabled receivers function in the low-power receive mode when in shutdown.M A X 220–M A X 249Tables 1a–1d define the control states. The MAX244has no control pins and is not included in these tables. The MAX246 has ten receivers and eight drivers with two control pins, each controlling one side of the device. A logic high at the A-side control input (ENA )causes the four A-side receivers and drivers to go into a three-state mode. Similarly, the B-side control input (ENB ) causes the four B-side drivers and receivers to go into a three-state mode. As in the MAX245, one A-side and one B-side receiver (RA5 and RB5) remain active at all times. The entire device is put into shut-down mode when both the A and B sides are disabled (ENA = ENB = +5V).The MAX247 provides nine receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs each control four drivers. The ninth receiver (RB5) is always active.The device enters shutdown mode with a logic high on both ENTA and ENTB .The MAX248 provides eight receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs control four drivers each. This part does not have an always-active receiver. The device enters shutdown mode and trans-mitters go into a three-state mode with a logic high on both ENTA and ENTB .The MAX249 provides ten receivers and six drivers with four control pins. The ENRA and ENRB receiver enable inputs each control five receiver outputs. The ENTA and ENTB transmitter enable inputs control three dri-vers each. There is no always-active receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both ENTA and ENTB . In shutdown mode, active receivers operate in a low-power receive mode at data rates up to 20kbits/sec.__________Applications InformationFigures 5 through 25 show pin configurations and typi-cal operating circuits. In applications that are sensitive to power-supply noise, V CC should be decoupled to ground with a capacitor of the same value as C1 and C2 connected as close as possible to the device.Drivers/Receivers16______________________________________________________________________________________。

MAX6307UK50D2-T中文资料

nfigurations and Typical Operating Circuit appear at end of data sheet. Ordering Information continued at end of data sheet. Standard Versions Table appears at end of data sheet.
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.
PARAMETER VCC Range Supply Current ICC SYMBOL VCC = 5.5V MAX6306/MAX6307/ MAX6309/MAX6310/ MAX6312/MAX6313 VTH MAX6306E/MAX6307/ MAX6309E/MAX6310E/ MAX6312E/MAX6313E Reset Threshold Reset Threshold VTH/°C VTH HYST D1 Reset Timeout Period tRP D2 D3 D4 VCC > 4.25V, ISINK = 3.2mA VOL RESET Output Voltage VOH MAX6305–MAX6310 VCC > 2.5V, ISINK = 1.2mA VCC > 1.2V, ISINK = 500µA VCC > 1.0V, ISINK = 50µA VCC > 4.25V, MAX6308/MAX6309/ ISOURCE = 800µA MAX6310 VCC > 2.5V, ISOURCE = 500µA VCC > 4.25V, ISINK = 3.2mA VCC > 2.5V, ISINK = 1.2mA MAX6311/MAX6312/ VCC > 1.8V, MAX6313 ISOURCE = 150µA VCC > 1.0V, ISOURCE = 10µA 0.8 x VCC 0.8 x VCC VCC - 1.5 V 0.8 x VCC 0.4 0.3 V 1.0 20 140 1120 TA = +25°C TA = 0°C to +70°C VTH 1.5% VTH 2.5% VTH 2.5% CONDITIONS TA = -40°C to +85°C (Note 2) MIN 1.0 8 VTH VTH TYP MAX 5.5 16 VTH + 1.5% VTH + 2.5% VTH + 2.5% ppm/°C mV 2.0 40 280 2240 0.4 0.3 0.3 0.3 V ms V UNITS

MAX266中文数据手册

MAX266中文数据手册MAX266/265中文数据手册By Hi_Cracker @whu引脚电阻可编程通用高效滤波器-----MAX266/265General Description和MAX265是高效的容滤波器，专门设计用于需要高精度滤波的应用MAX266场合。

内置了两个独立的滤波模块，可以配置成低通，高通，带通，带阻，全通滤波器。

中心频率或者截止频率的控制需要外接电阻以及6 Pin-Strapped 的输入特性来编程实现，然而，Q值仅用电阻连接实现。

各种各样类型的滤波器都可以实现（巴特沃斯，切比雪夫，椭圆滤波器等等）。

内部集成了两个运算放大器。

MAX265可以将中心/截止频率可以最高调到40Khz，然而，MAX266，通过使用一个低范围的fclk/fo比例系数，可以将fos 调到140Khz。

4MHZ系统时钟，可以通过一个晶振或是额外的源获得。

滤波器的操作电压为从±2.37v到±6.3v或者+5V的单电源供电。

Application：声纳电子设备Anti-Aliasing 滤波器数字信号处理震动音频分析远程通信测试仪器Features滤波器参数设置软件化256bit的频率控制字电阻调整Q值和fo140Khz频率调节范围±5V或者单电源﹢5V操作电压Introduction每个MAX266/265都包含的两个可配置滤波器模块已经显示在数据手册前面的功能框图上。

fclk/fo编程输入（F0-F5）被两个滤波模块共用,然而，每个部分的fo仍然受到各自外接电阻的独立调节。

各个模块的的Q值也是受到各自的外接电阻的独立调节的。

MAX266使用比MAX265更低范围的取样比率（fclk/fo），这样就可以产生更高的信号带宽以及fo的可编程范围。

降低fclk/fo产生的影响主要就是比MAX265的滤波器参数的连续性稍微差了一些，但是这些不同可以通过使用图23所示的图形或是美信得滤波器软件来补偿。

MAX6367PKA44+T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 .)。

YAV MAX PRO无线多功能采集卡技术手册WIFI8572 ZIGBEE8572 BT8572

YAV MAX PRO无线多功能采集卡技术手册V1801武汉亚为电子科技有限公司WIFI8572ZIGBEE8572BT8572关于本手册为亚为推出的YA V MAX PRO数据采集卡的用户手册，主要内容包括功能概述、12路模拟量输入功能、4路数字量输入、2路PWM输出、2路模拟量输出、应用实例、性能测试、注意事项及故障排除等。

说明序号版本号编写人编写日期支持对象应用时间特别说明1 1.0郑先科2014.05YA V MAX PRO采集卡2 2.0郑先科2016.01YA V MAX PRO采集卡3 3.0郑先科2017.01YA V MAX PRO采集卡2017.01适用于RS232\485\WiFi\GPRS ZIGBEE\蓝牙\433M无线4 4.0李雪2017.08YA V MAX PRO采集卡2017.08目录0.快速上手 (1)产品包装内容 (1)应用软件 (1)接口定义 (1)⏹端子排列 (1)⏹端子描述 (2)通信 (3)1.产品概述 (3)技术指标 (3)⏹模拟信号输入 (4)⏹数字信号输入 (5)⏹数字信号输出 (5)⏹模拟信号输出 (6)⏹PWM输入 (6)⏹PWM输出 (6)⏹通信总线 (6)⏹温度参数 (6)硬件特点 (7)原理框图 (7)2.采集卡信号接线 (9)AI模拟量接线 (9)DI数字量接线 (9)DO数字量接线 (10)3.模拟量输入功能 (11)模拟量输入 (11)输入采样原理 (11)输入接线 (11)采样值计算 (13)⏹无符号整型 (13)⏹ADC数据类型 (13)⏹模拟量值 (13)4.模拟量输出功能 (14)输出原理 (14)5.数字量输入功能 (14)数字输入原理 (14)DI高低电平/无源触点输入 (15)计数功能输入 (15)测频功能输入 (15)PWM功能输入 (16)编码器输入 (16)AO输出匹配输入 (16)输入接线方式 (16)6.数字量输出功能 (17)输出原理 (17)DO高低电平输出 (18)输出接线方式 (18)PWM输出 (19)7.通信协议 (19)亚为WSN无线模块IOT通信协议 (19)8.应用实例 (22)软件应用 (22)⏹组态及PLC (23)⏹WSN无线通信 (24)9.注意事项及故障排除 (25)注意事项 (25)⏹存储说明 (25)⏹出货清单 (25)⏹质保及售后 (25)⏹特别说明 (25)故障排除 (26)⏹无法正常连接至上位机 (26)⏹VI文件打不开 (27)⏹数值不正常 (27)⏹DI测频计数没反应 (27)⏹多卡数据相同 (28)⏹采集速度不够 (28)⏹软件出现错误 (28)10.性能测试 (28)安全规范 (28)耐电压范围测试 (29)环境适应性测试 (29)11.文档权利及免责声明 (30)12.联系方式.......................................................................................................................错误！未定义书签。

单片机

引脚图
特性
（1）12位分辨率，1/2LSB线形度；（2）单+5V供电；（3）软件可编程选择输入量程： 10V， 5V，0~+5V， 0~+10V；（4）输入多路选择器保护： 16.5V （5）8路模拟输入通道；（6）6us转换时间，100kSPS采样速度；（7）内/外部采集控制；（8）内部4.096V或外部参考电压；（9）两种掉电模式；（10）内部或外部时钟。
控制字及各位的定义
D7 (MSB) D6 D5 D4 D3 D2 D1 D0
PD1
PD0
ACQ MOD
RNG
BIP
A2
A1
A0
控制字位定义
位 7、 6 5 名称说明 PD1、PD0 这两位是用来选择时钟和掉电模式 ACQMOD 0时内部控制采集（6个时钟周期），1时外部控制采集用来选择满量程是输入模拟电压幅度用来选择双极性或单极性转换模式这三位用来确定被选通的模拟输入通道
A2 0 0 00 0 1 0 1 0 1 0 1
CH0 *
CH1
CH2
CH3
CH4
CH5
CH6
CH7
* * * * * * *
4 3 2、1、0
RNG BIP A2、A1、 A0
量程与极性选择
BIP RNG 0 0 1 1 0 1 0 1 输入量程 0~5 0~10 正负5 正负10
时钟与掉电模式选择
PD1 PD2 器件工作模式 0 0 1 1 0 1 0 1
工作状态/外部时钟模式工作状态/内部时钟模式待机模式，时钟模式不变待机模式，时钟模式不变
A/D转换器MAX197
在数据采集系统中，A/D转换的速度和精度又决定了采集系统的速度和精度。MAX197是Maxim公司推出的具有12位测量精度的高速A/D转换芯片，只需单一电源供电，且转换时间很短(6us)，具有 8路输入通道，还提供了标准的并行接口——8位三态数据I/O口，可以和大部分单片机直接接口，使用十分方便中文名:MAX197 属性:转换芯片出品公司:Maxim 特点:具有12位测量精度高速转换应用领域:数据采集系统模式:内部采样模式和外部采样模式