TL7705
单片机掉电保护)总结
单片机应用系统断电时的数据保护方法在测量、控制等领域的应用中，常要求单片机内部和外部RAM中的数据在电源掉电时不丢失，重新加电时，RAM中的数据能够保存完好，这就要求对单片机系统加接掉电保护电路。
掉电保护通常可采用以下三种方法：一是加接不间断电源，让整个系统在掉电时继续工作，二是采用备份电源，掉电后保护系统中全部或部分数据存储单元的内容；三是采用EEPROM来保存数据。
由于第一种方法体积大、成本高，对单片机系统来说，不宜采用。
第二种方法是根据实际需要，掉电时保存一些必要的数据，使系统在电源恢复后，能够继续执行程序，因而经济实用，故大量采用[1]。
EEPROM既具有ROM掉电不丢失数据的特点，又有RAM随机读写的特点。
但由于其读写速度与读写次数的限制，使得EEPROM不能完全代替RAM。
下面将介绍最常用的一些掉电保护的处理方法，希望能对相关设计人员在实际工作中有所帮助。
1 简单的RAM数据掉电保护电路在具有掉电保护功能的单片机系统中，一般采用CMOS单片机和CMOS RAM。
CMOS型RAM存储器静态电源小，在正常工作状态下一般由电源向片外RAM供电，而在断电状态下由小型蓄电池向片外RAM供电，以保存有用数据，采用这种方法保存数据，时间一般在3－5个月[2]。
然而，系统在上电及断电过程中，总线状态的不确定性往往导致RAM内某些数据的变化，即数据受到冲失。
因此对于断电保护数据用的RAM存储器，除了配置供电切换电路外，还要采取数据防冲失措施，当电源突然断电时，电压下降有个过程，CPU在此过程中会失控，可能会误发出写信而冲失RAM中的数据，仅有电池是不能有效完成数据保护的，还需要对片选信号加以控制，保证整个切换过程中CS引脚的信号一直保持接近VCC。
通常，采用在RAM的CS和VCC引脚之间接一个电阻来实现COMS RAM的电源切换，然而，如果在掉电时，译码器的输出出现低电平，就可能出现问题，图1给出一种简单的电路设计，它能够避免上述问题的产生。
tl7705a原理
tl7705a原理
TL7705A是一种用于电源管理的集成电路，可以广泛应用于电子设备中。
本文将从原理的角度来介绍TL7705A的工作原理和应用。
TL7705A是一种电源管理IC，它主要用于监测和控制电源电压，并提供过电流和过温度保护。
它可以在电源电压超出设定范围时进行报警或自动断电，以保护电子设备的安全运行。
TL7705A的工作原理基于反馈控制的思想。
它通过对电源电压进行采样和比较，根据比较结果来控制输出电路。
当电源电压低于设定值时，TL7705A会通过比较器产生一个低电平信号，从而触发控制电路，使输出电路断开。
当电源电压恢复到设定值以上时，TL7705A会停止产生低电平信号，输出电路恢复正常工作。
TL7705A还具有过电流和过温度保护功能。
当电流超出设定范围或温度超过限定值时，TL7705A会发出警报信号或自动断开电路，以防止电子设备损坏或发生故障。
TL7705A的应用非常广泛。
它可以用于电源管理系统中的电压监测和控制，保证电源的稳定输出。
它还可以用于电池管理系统，监测和控制电池的电压，防止电池过放或过充。
此外，TL7705A还可以用于电源逆变器和开关电源中，提供电源保护和控制。
TL7705A是一种功能强大的电源管理IC，具有电压监测、过电流保
护和过温度保护等功能。
它的工作原理基于反馈控制，可以有效地保护电子设备的安全运行。
同时，它的应用范围广泛，可以用于各种电源管理系统和电子设备中。
通过使用TL7705A，可以提高电子设备的可靠性和稳定性。
常用稳压二极管型号
常用稳压二极管型号〔转〕2008-05-12 15:06:44原型号国外型号稳压值国替代型号1N746 H23 MA4030 RD417E RD217EB2.5-3.5 2CW511N747 1N748 1N749 HZ4 RD3.9E3.9-4.5 2CW521N750 1N751 HZ5 05Z5.1 RD5A RD5.1E4-5.8 2CW531N752 1N753 HZ6 HZ6.2E 05Z5.6E RD6A5.5-6.5 2CW541N754 HZ6.8E 02Z6。
8A RD6.8E RD7A 6.2-7.52CW551N755 1N756 HZ7 HZ7.5E 05Z7.5 RD7.57-8.5 2CW561N757 HZ9 RD9A8.5-9.52CW571N758 HZ10A RD10E9.2-10.52CW581N714 1N962 1S335 HZ11 HZ11E RD11E10-11.8 2CW591N963 HZ12E 05Z12 BZX79C12 RD12E11.5-12.5 2CW601N717 1N964 1S270 HZ12B2 MA113012.2-14 2CW611N718 1N965 1N966 HZ15-1 05Z15 RD15E13.5-17 2CW621N967 HZ18-1 HZ18-2 05Z18 RD18E16-19 2CW631N968 HZ20-1 RD20E18-212CW641N969 HZ24E RD24E20-242CW651N970 02Z2423-262CW661N971 HZ2725-282CW671N972 RD31E27-322CW681N973 1N974 HZ733 ZX0249E UPC574J31-35 2CW69 2CW70稳压二极管型号对照表美标稳压二极管型号1N4727 3V01N4728 3V31N4729 3V61N4730 3V91N4731 4V31N4732 4V71N4733 5V11N4734 5V61N4735 6V21N4736 6V81N4737 7V51N4738 8V21N4739 9V11N4740 10V1N4741 11V1N4742 12V1N4744 15V1N4745 16V1N4746 18V1N4747 20V1N4748 22V1N4749 24V1N4750 27V1N4751 30V1N4752 33V1N4753 36V1N4754 39V1N4755 43V1N4756 47V1N4757 51V需要规格书请到以下地址下载，.dccomponents./products/Rectifiers/Diode/Zener/经常看到很多板子上有M记的铁壳封装的稳压管，都是以美标的1N系列型号标识的，没有具体的电压值，刚刚翻手册查了以下3V至51V的型号与电压的对照值，希望对大家有用1N4727 3V01N4728 3V31N4729 3V61N4730 3V91N4731 4V31N4732 4V71N4733 5V11N4734 5V61N4735 6V21N4736 6V81N4737 7V51N4738 8V21N4739 9V11N4740 10V1N4741 11V1N4742 12V1N4743 13V1N4744 15V1N4745 16V1N4746 18V1N4747 20V1N4748 22V1N4749 24V1N4750 27V1N4752 33V1N4753 36V1N4754 39V1N4755 43V1N4756 47V1N4757 51VDZ是稳压管的电器编号，是和1N4148和相近的，其实1N4148就是一个0.6V的稳压管，下面是稳压管上的编号对应的稳压值，有些小的稳压管也会在管体上直接标稳压电压，如5V6就是5.6V的稳压管。
TL7705中文资料
Supply voltage SupervisorTL77xx SeriesAuthor: Eilhard HaseloffLiterature Number: SLVAE04March 1997iIMPORTANT NOTICETexas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current.TI warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (“Critical Applications”).TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI products in such applications requires the written approval of an appropriate TI officer. Questions concerning potential risk applications should be directed to TI through a local SC sales office.In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards.TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used.Copyright ©1982, 1997, Texas Instruments IncorporatedContents1. Introduction (1)2. Circuit Description (2)3. Application examples (5)4. Design Tips (12)5. Summary (14)List of Figures1 Reset circuit (1)2 Functional Diagram (3)3 Diagram for Calculation of Ct (3)4 Timing diagram (4)5 TL7705A in 5 Volt Microcomputer Applications (6)6 Voltage Supervision of a multiple power supply (6)7 Typical Trigger Sensitivity at the SENSE input of the voltage monitor TL7705A (7)8 Circuit for Reduced Trigger Sensitivity (8)9 Modified Output Circuit (9)10 Circuit Diagram for Data Protection in a battery buffered memory (10)11 Typical Variation of the Reference Voltage Vref versus supply Voltage Variations (10)12 Typical Variation of the Reference Voltage Vref versus Ambient Temperature Variations (11)13 Buffered Circuit for the Reference Voltage (12)14 Printed Circuit Layout for the supply voltage supervisor (13)15 Series Resistor at the Ctinput of the TL770xB (14)Supply voltage Supervisor TL77xx Series iiiivLiterature Number: SLVAE04Supply Voltage Supervisor TL77xx SeriesABSTRACTAfter power-on a digital system must be forced into a definite initial state. For microcomputers and microprocessors a Reset input is provided to which, in simple applications, an R/C network is connected. After power-on, this circuitry maintains the logic level at this input high (or low), until the supply voltage has reached its nominal value, and the internal logic of the microcomputer has executed the Reset. However, this simple circuit does not work well under all conditions, or during short drops of the supply voltage. This applications report describes the operation and the application of the supply voltage supervisor circuits series TL77xx, which has been specially designed to solve these applications problems.1. IntroductionAfter power-on a digital system must normally be forced into a definite initial state. For microcomputers and microprocessors a reset input is provided to which, in simple applications, an R/C network is connected. After power-on, this circuitry maintains the logic level at this input high (or low), until the supply voltage has reached its nominal value, and the internal logic of the microcomputer has executed the initialization of the system.Supply voltage Supervisor TL77xx Series1Circuit Description2Literature Number: SLVAE04In larger computers several features are provided to prevent such errors: a power-fail interrupt signals dangerous conditions in time, the content of the memory is protected by a battery back-up, and so on. In small microcomputer systems this amount of effort is too expensive, and in most applications also not required. It is usually sufficient if, after a serious voltage drop, the microcomputer is forced into a defined initial condition. To implement this function, whilst preventing the problems mentioned above, the following circuit features are required:− Accurate detection of a serious voltage drop.− Generation of a reset signal while as the supply voltage is not in the operationalrange, to prevent undefined operations of the microcomputer.− Maintenance of the reset signal for a certain time after the supply voltage hasreturned to its nominal value, to ensure proper initialization of the circuit.For these applications, Texas Instruments has developed a series of integrated circuits which, with a minimum of external components and without additional adjustment, will fulfill the requirements described above.2. Circuit DescriptionThe main part of this circuit is a reference voltage source, which consists of a very stable, temperature-compensated band gap reference. An external capacitor (typ. 0.1 µF) must be connected to the voltage output V ref , to reduce the influence of fast transients in the supply voltage. The voltage at the SENSE input is divided by a resistor divider and compared with the reference voltage by a comparator. To achieve high accuracy, this divider is adjusted at wafer probe. When the input voltage is sensed to be lower than the threshold voltage, the thyristor is triggered, which discharges the timing capacitor C t . It is also possible to fire the thyristor via the RESIN input by a logic level (TTL level, active low). The thyristor is turned off again when either the voltage at the SENSE input (or RESIN input) increases beyond the threshold, or - during short supply voltage drops - the discharge current of the capacitor becomes lower than the hold current of the thyristor.Thereafter, the capacitor is recharged by a current source 100 µA, the charge time being calculated as follows:t C d t =⋅⋅13104. C t in F, t in sThe magnitude of charge current and therefore also the delay t d time is determined by the tolerance of the resistors in the integrated circuit. These tolerances, caused by the semiconductor manufacturing process,are not negligible. Therefore the delay time may vary -50 % to +100 %. However, for the applications discussed here this will not be a restriction. The diagram in figure 3 shows the typical delay time t d versus the capacitance of the external capacitor C t .Circuit DescriptionSupply voltage Supervisor TL77xx Series3 Note:R1typR2typTL77020∞TL77059.0 kΩ10.0 kΩTL770920.4 kΩ10.0 kΩTL771235.6 kΩ10.0 kΩTL771546.8 kΩ10.0 kΩFigure 2. Functional DiagramFigure 3. Diagram for Calculation of CtCircuit Description4Literature Number: SLVAE04An additional comparator compares the voltage at the capacitor with the reference voltage and forces the outputs into the active state as long as the voltage at the capacitor is lower than the reference voltage.Figure 4 shows the timing of the various signals. In this example the SENSE input is connected to the supply voltage V cc as in typical applications of this device. The minimum supply voltage for which the function of this device is guaranteed is 3.6 V. After power-on the outputs are undefined until the minimum supply voltage V res is reached. For the TL77xxA the minimum supply voltage is V res = 3.0 V (typical 2.5 V),for the TL77xxB is V res = 1.0 V. Also, when using the TL77xxB it has to be noted, that with such low supply voltages the function of the reset input of the following circuit may not be guaranteed.Beyond the voltage V res the capacitor C t is first kept discharged, and the outputs stay in the active state(RESET = High, RESET = Low). When the input voltage becomes higher than the threshold voltage V t , the thyristor is turned off and the capacitor is charged. After a delay, t d , the voltage at the capacitor passes the trigger level of the output comparator and the outputs become inactive. The circuit to beinitialized is now set to a defined state and starts the correct operation.Application examplesSupply voltage Supervisor TL77xx Series 5power-on, short voltage fluctuations do not repetitively reset the system. Delay times of 10 to 20 ms or even up to 500 ms will usually avoid these problems. Owing to an internal limitation of discharge current of the timing capacitor C t , there is no upper limit for the size of this capacitor.3. Application examplesFive versions of this circuit are available:− TL7705A, TL7705B (V t = 4.55 V): Application in TTL-systems and micro-computer systems which require a 5 volt supply (e.g. TMS7000)− TL7709A (V t = 7.6 V): Application in microcomputer systems using the TMS1XXXNLL.− TL7712A (V t = 10.8 V): Application in CMOS, microprocessor, and memory circuits with a 12 volt supply.− TL7715A (V t = 13.5 V): Application in circuits which operate with a supply voltage of 15 V, as is found often in analog circuits.− TL7702A, TL7702B (V t = 2.5 V): Application in systems where other supply voltages are used. The required trigger level my be adjusted with an externalresistor divider at the SENSE input.Since for most applications the circuits are already adjusted to the appropriate voltage levels, these devices are easy to use. Figure 5 shows the initialization circuit diagrams for TMS7000 microcomputer system with supply voltage V cc = 5 V. The external components required are the decoupling capacitor C ref for the reference voltage and the timing capacitor C t . The outputs of the TL77xx are open collector outputs.In figure 5 therefore a pull-up resistor is shown at the RESET output to ensure the correct High level.Application examples6Literature Number: SLVAE04Figure 6. Voltage Supervision of a multiple power supplyIn larger systems, where several supply voltages are required, it is necessary to supervise all supplyvoltages which may cause dangerous conditions in case of power failure. In the circuit diagram of figure 6, two TL7712A's are used to monitor the positive and the negative 12 volt supplies. Their outputs are fed to the RESIN input of the TL7705A, which monitors the 5 volt supply. The output of this device provides a reset signal, which becomes active whenever any one of the three supply voltages fails. A reset signal can be generated manually via a switch which is connected to the voltage monitor of the positive 12 V supply. When designing a supply voltage monitor the designer has to take care, that when only one of the supply voltages becomes marginal or fails, a defined reset signal is generated (at least if the main supply voltage 5 V is still available). Therefore the circuit which monitors the 12 V supply voltage is supplied by the 5 V supply. The reset signal of the circuit which monitors the negative supply is fed via a resistor divider to the base of the transistor BC546, which controls the RESIN input of the TL7705A. The voltage divider is designed so that a reset is generated even if the negative supply fails totally.The capacitor which determines the delay of the two circuits which monitors the both 12 v supplies, can be chosen short (in the example shown here it is 0.01µF). The output of these circuits has only to trigger the third monitor TL7705A. The final duration of the reset signal will be determined by the capacitor Ctof the last mentioned circuit.These supply voltage supervisor circuits were designed to detect supply voltage drops as short as>300 ns. In figure 7 the minimum pulse width td minat the SENSE input is shown versus the amplitude of theApplication examplessupply voltage drop ∆V cc which is required to trigger the voltage monitor. The sensitivity of the other circuits (TL7702, TL7712 etc.) can be calculated as proportional to the trigger voltage ratio.-2 V-1,8 V-1,6 V-1,4 V-1,2 V-1 V-0,8 V-0,6 V-0,4 V-0,2 VFigure 7. Typical Trigger Sensitivity at the SENSE input of thevoltage monitor TL7705AApplication examplesIn applications where this performance is not required, sensitivity can be reduced by placing an R-C filter infront of SENSE input. To avoid a unacceptable change of the threshold voltage of circuits with a fixed threshold voltage (TL7705, TL7709, TL7712, TL7715) the value of the resistor should be a few 10Ω only. In application like this it may be better to use the TL7702A. With this circuit the threshold voltage can beset to the desired value by a high impedance voltage monitor. A small filter capacitor Cfat the SENSEinput reduces the trigger sensitivity (figure 8).In some applications it is necessary to keep the output of the reset circuit active even if no supply voltageis applied. Under normal conditions the output transistor of the TL77xxA is turned off (inactive state), whenthe supply voltage is lower than 3 V (Vcc> 1 V for the TL77xxB). In figure 9 a P-channel field effecttransistor is connected to the RESET output. This transistor conducts when the supply voltage drops below3 V i.e. at a gate source voltage of -3 V or less. To ensure that the transistor is switched off when thesupply voltage has reached the nominal value, the gate has to be at least 6 V more positive than thesource (or the required high level e.g. 2.4 V). In figure 9 therefore the voltage monitor is supplied by supplyvoltage of 12 V. Since the requirements for th is supply voltage in terms of stability are not high, this supplyvoltage for example can be taken from the filter capacitor in front of the voltage regulator in the powersupply.Figure 9. Modified Output CircuitA further application for these integrated circuits is in battery-buffered memory systems. When the linevoltage fails, the content of the memory must not be corrupted by a random write operation of themicrocomputer. These uncontrolled write operations may take place at low supply voltage even if a resetsignal is applied to the processor. Generally, it is sufficient to switch the chip select line into the inactivestate (some memories require that the write line also be disabled). A switch, which consists of transistor Q1 and diode D1, is inserted into the chip select line of the memory. Under normal operation (line voltagepresent) the output of the TL7705B is turned off (high); the transistor Q1draws its base current fromtransistor Q2 and resistor R1. When the chip select line is switched from high to low by the supervisingmicroprocessor, the transistor conducts and the CS input of the memory goes low and the memory is enabled. Because of the small DC load of the resistor R2, the saturation voltage of the transistor (andApplication examples therefore the shift of the low level at the CS input) is very small (typ. 40 mV). When the chip select line isis turned off (the influence of the inverse current switched high again by the processor, the transistor Q1conducts and charges the circuit capacitance. In the case of a power-gain is negligible); the diode D1failure the TL7705B is triggered and its RESET output becomes low. The base of transistor Qcan no1longer draw current. Thus the CS input of the memory is separated from the chip select line.Application examplesFigure 11. Typical Variation of the Reference Voltage V ref versus supply Voltage VariationsAs has already been mentioned the supply voltage supervisors of the series TL77xxA incorporate extremely stable reference voltage source which can be accessed at the V ref terminal. This voltage source can also be used when in other applications a constant voltage source is required. As shown in picture 11,the reference voltage V ref varies less than 10 mV, when the supply voltage is changed from 3.5 … 18 V.The same stability of the reference voltage is maintained, when the ambient temperature is changed.Figure 12 shows the typical characteristic. The references voltage varies only 16 mV, when the ambient temperature is changed from -40 … 85 °C.2,506 V2,508 V2,51 V2,512 V2,514 V2,516 V2,518 V2,52 V2,522 V-40-20020406080100V refT a /°CFigure 12. Typical Variation of the Reference Voltage V ref versus Ambient Temperature VariationsWhen using the integrated reference voltage to supply other circuits, the designer has to consider that maximum current available from this voltage source is in the order of 100 µA only. With higher loads, the stability of the reference voltage suffers. For higher currents a buffer in the form of an operational amplifier connected as an emitter follower is recommended (figure 13). If the voltage monitor section of the circuit is not used in this application, the capacitor C t is not required. This terminal may then be left open. The inputs SENSE and RESIN are connected to ground.Design TipsDesign TipsSummary。
稳压芯片的型号和功能介绍
下面是收集整理的一些资料常用电源及稳压芯片LM2930T-5.0 5.0V低压差稳压器LM2930T-8.0 8.0V低压差稳压器LM2931AZ-5.0 5.0V低压差稳压器(TO-92)LM2931T-5.0 5.0V低压差稳压器LM2931CT 3V to 29V低压差稳压器(TO-220,5PIN)LM2940CT-5.0 5.0V低压差稳压器LM2940CT-8.0 8.0V低压差稳压器LM2940CT-9.0 9.0V低压差稳压器LM2940CT-10 10V低压差稳压器LM2940CT-12 12V低压差稳压器LM2940CT-15 15V低压差稳压器LM123K 5V稳压器(3A)LM323K 5V稳压器(3A)LM117K 1.2V to 37V三端正可调稳压器(1.5A) LM317LZ 1.2V to 37V三端正可调稳压器(0.1A) LM317T 1.2V to 37V三端正可调稳压器(1.5A) LM317K 1.2V to 37V三端正可调稳压器(1.5A) LM133K 三端可调-1.2V to -37V稳压器(3.0A)LM333K 三端可调-1.2V to -37V稳压器(3.0A)LM337K 三端可调-1.2V to -37V稳压器(1.5A)LM337T 三端可调-1.2V to -37V稳压器(1.5A)LM337LZ 三端可调-1.2V to -37V稳压器(0.1A) LM150K 三端可调1.2V to 32V稳压器(3A)LM350K 三端可调1.2V to 32V稳压器(3A)LM350T 三端可调1.2V to 32V稳压器(3A)LM138K 三端正可调1.2V to 32V稳压器(5A)LM338T 三端正可调1.2V to 32V稳压器(5A)LM338K 三端正可调1.2V to 32V稳压器(5A)LM336-2.5 2.5V精密基准电压源LM336-5.0 5.0V精密基准电压源LM385-1.2 1.2V精密基准电压源LM385-2.5 2.5V精密基准电压源LM399H 6.9999V精密基准电压源LM431ACZ 精密可调2.5V to 36V基准稳压源LM723 高精度可调2V to 37V稳压器LM105 高精度可调4.5V to 40V稳压器LM305 高精度可调4.5V to 40V稳压器MC1403 2.5V基准电压源MC34063 充电控制器SG3524 脉宽调制开关电源控制器TL431 精密可调2.5V to 36V基准稳压源TL494 脉宽调制开关电源控制器TL497 频率调制开关电源控制器TL7705 电池供电/欠压控制器7805 正5V稳压器(1A)7806 正6V稳压器(1A)7808 正8V稳压器(1A)7809 正9V稳压议（1A）7812 正12V稳压器(1A)7815 正15V稳压器(1A)7818 正18V稳压器(1A)7824 正24V稳压器(1A)7905 负5V稳压器(1A)7906 负6V稳压器(1A)7908 负8V稳压器(1A)7909 负9V稳压器（1A）7912 负12V稳压器(1A)7915 负15V稳压器(1A) 7918 负18V稳压器(1A) 7924 负24V稳压器(1A)78L05 正5V稳压器(100ma) 78L06 正6V稳压器(100ma) 78L08 正8V稳压器(100ma) 78L09 正9V稳压器(100ma) 78L12 正12V稳压器(100ma) 78L15 正15V稳压器(100ma) 78L18 正18V稳压器(100ma) 78L24 正24V稳压器(100ma)。
T7705A中文资料
PACKAGING INFORMATIONOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)5962-88685012A OBSOLETE LCCC FK20TBD Call TI Call TI TL7702ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7702AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7702AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7705ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg Type 31-Oct-2006Orderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)(RoHS)TL7705ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705ACPSLE OBSOLETE SO PS8TBD Call TI Call TITL7705ACPSR ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACPSRE4ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7705AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7705AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7709ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7709ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7709AID OBSOLETE SOIC D8TBD Call TI Call TITL7709AIP OBSOLETE PDIP P8TBD Call TI Call TITL7712ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7712ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg Type 31-Oct-2006Orderable DeviceStatus (1)Package Type Package DrawingPins Package QtyEco Plan (2)Lead/Ball FinishMSL Peak Temp (3)(RoHS)TL7712ACPE4ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7712AID OBSOLETE SOIC D 8TBD Call TI Call TI TL7712AIP OBSOLETE PDIP P 8TBD Call TI Call TITL7715ACD ACTIVE SOIC D 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACDE4ACTIVE SOIC D 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACP ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715ACPE4ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715AID OBSOLETE SOIC D 8TBD Call TI Call TI TL7715AIPOBSOLETEPDIPP8TBDCall TICall TI(1)The marketing status values are defined as follows:ACTIVE:Product device recommended for new designs.LIFEBUY:TI has announced that the device will be discontinued,and a lifetime-buy period is in effect.NRND:Not recommended for new designs.Device is in production to support existing customers,but TI does not recommend using this part in a new design.PREVIEW:Device has been announced but is not in production.Samples may or may not be available.OBSOLETE:TI has discontinued the production of the device.(2)Eco Plan -The planned eco-friendly classification:Pb-Free (RoHS),Pb-Free (RoHS Exempt),or Green (RoHS &no Sb/Br)-please check /productcontent for the latest availability information and additional product content details.TBD:The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS):TI's terms "Lead-Free"or "Pb-Free"mean semiconductor products that are compatible with the current RoHS requirements for all 6substances,including the requirement that lead not exceed 0.1%by weight in homogeneous materials.Where designed to be soldered at high temperatures,TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1)lead-based flip-chip solderbumps used between the die and package,or 2)lead-based die adhesive used between the die and leadframe.The component is otherwise considered Pb-Free (RoHS compatible)as defined above.Green (RoHS &no Sb/Br):TI defines "Green"to mean Pb-Free (RoHS compatible),and free of Bromine (Br)and Antimony (Sb)based flame retardants (Br or Sb do not exceed 0.1%by weight in homogeneous material)(3)MSL,Peak Temp.--The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications,and peak solder temperature.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.TI bases its knowledge and belief on information provided by third parties,and makes no representation or warranty as to the accuracy of such information.Efforts are underway to better integrate information from third parties.TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary,and thus CAS numbers and other limited information may not be available for release.In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s)at issue in this document sold by TI to Customer on an annual basis.PACKAGE OPTION ADDENDUM31-Oct-2006Addendum-Page 3IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. T esting and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. T o minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation.Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. 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tl7705a 芯片说明
1POST OFFICE BOX 655303 •DALLAS, TEXAS 75265DExternally Adjustable Pulse Durationdescription/ordering informationORDERING INFORMATION {T APACKAGE }ORDERABLEPART NUMBER TOP-SIDE MARKING PDIP (P)Tube of 50TL7702ACP TL7702ACP SOIC (D)Tube of 75TL7702ACD SOIC (D)Reel of 2500TL7702ACDR 7702AC PDIP (P)Tube of 50TL7705ACP TL7705ACP SOIC (D)Tube of 75TL7705ACD SOIC (D)Reel of 2500TL7705ACDR 7705AC SOP (PS)Reel of 2000TL7705ACPSR T7705A °°PDIP (P)Tube of 50TL7709ACP TL7709ACP 0C to 70CSOIC (D)Tube of 75TL7709ACD SOIC (D)Reel of 2500TL7709ACDR 7709AC PDIP (P)Tube of 50TL7712ACP TL7709ACP SOIC (D)Tube of 75TL7712ACD SOIC (D)Reel of 2500TL7712ACDR 7712AC PDIP (P)Tube of 50TL7715ACP TL7715ACP SOIC (D)Tube of 75TL7715ACD 7715AC PDIP (P)Tube of 50TL7702AIP TL7702AIP SOIC (D)Tube of 75TL7702AID SOIC (D)Reel of 2500TL7702AIDR 7702AI −40°C to 85°PDIP (P)Tube of 50TL7705AIP TL7705AIP 40CSOIC (D)Tube of 75TL7705AID SOIC (D)Reel of 2500TL7705AIDR 7705AI SOIC (D)Reel of 2500TL7712AIDR7712AI†For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at .‡Package drawings, thermal data, and symbolization are available at /packaging.PRODUCTION DATA in ormation is current as o publication date.Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.TL7702A, TL7705A, TL7709A, TL7712A, TL7715A SUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20092POST OFFICE BOX 655303 •DALLAS, TEXAS 75265description/ordering information (continued)The TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically for use as reset controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low)when V CC attains a value approaching 3.6 V. At this point (assuming that SENSE is above V IT+), the delay timer function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively).When an undervoltage condition occurs during normal operation, RESET and RESET go active. T o ensure that a complete reset occurs, the reset outputs remain active for a time delay after the voltage at the SENSE input exceeds the positive-going threshold value. The time delay is determined by the value of the external capacitor C T : t d = 1.3 × 104 × C T , where C T is in farads (F) and t d is in seconds (s).During power down and when SENSE is below V IT−, the outputs remain active until V CC falls below 2 V. After this, the outputs are undefined.An external capacitor (typically 0.1 µF) must be connected to REF to reduce the influence of fast transients in the supply voltage.functional block diagramThe functional block diagram is shown for illustrative purposes only; the actual circuit includes a trimming network to adjust the reference voltage and sense-comparator trip point.RESINSENSEGNDV CCCT REFNOTES: A.TL7702A: R1 = 0 Ω, R2 = openTL7705A: R1 = 7.8 k Ω, R2 = 10 k ΩTL7709A: R1 = 19.7 k Ω, R2 = 10 k ΩTL7712A: R1 = 32.7 k Ω, R2 = 10 k ΩTL7715A: R1 = 43.4 k Ω, R2 = 10 k ΩB.Resistor values shown are nominal.RESETRESETTL7702A, TL7705A, TL7709A, TL7712A, TL7715ASUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20093POST OFFICE BOX 655303 •DALLAS, TEXAS 75265timing diagramOutput UndefinedV CC and SENSEV CC ≈CC ≈ 2 Vabsolute maximum ratings over operating free-air temperature range (unless otherwise noted)†Supply voltage, V CC (see Note 1) 20 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range, V I , RESIN −0.3 V to 20 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range, V I , SENSE:TL7702A (see Note 2) −0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TL7705A −0.3 V to 20 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TL7709A −0.3 V to 20 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TL7712A, TL7715A −0.3 V to 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High-level output current, I OH , RESET −30 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low-level output current, I OL , RESET 30 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance, θJA (see Notes 3 and 4):D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . P package 85°C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS package 95°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . Operating virtual junction temperature, T J 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, T stg −65°C to 150°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 under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.NOTES: 1.All voltage values are with respect to GND.2.For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed V CC − 1 V or 6 V, whicheveris less.3.Maximum power dissipation is a function of T J (max), θJA , and T A . The maximum allowable power dissipation at any allowableambient temperature is P D = (T J (max) − T A )/θJA . Operating at the absolute maximum T J of 150°C can affect reliability.4.The package thermal impedance is calculated in accordance with JESD 51-7.TL7702A, TL7705A, TL7709A, TL7712A, TL7715A SUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20094POST OFFICE BOX 655303 •DALLAS, TEXAS 75265recommended operating conditionsMINMAX UNIT V CC Supply voltage3.518V V IH High-level input voltage at RESIN 2V V ILLow-level input voltage at RESIN0.6VTL7702A 0See Note 2TL7705A010V Input voltage, SENSE TL7709A 015VIp gTL7712A 020TL7715A020I OH High-level output current, RESET −16mA I OL Low-level output current, RESET 16mA Operating free air temperature range TL77xxAC 070T AOperating free-air temperature rangeTL77xxAI−4085°C NOTE 2:For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed V CC − 1 V or 6 V , whichever is less.electrical characteristics over recommended operating conditions (unless otherwise noted)TEST CONDITIONS TL77xxACTL77xxAI PARAMETER†MIN TYPMAXUNIT V OH High-level output voltage, RESET I OH = −16 mA V CC −1.5V V OL Low-level output voltage, RESET I OL = 16 mA 0.4V V refReference voltageT A = 25°C2.48 2.53 2.58VTL7702A 2.48 2.53 2.58N ti i i t th h ld lt TL7705A4.54.55 4.6Negative-going input threshold voltage,TL7709A = 25°7.57.67.7V IT−SENSETL7712A T A 25C10.610.811VTL7715A 13.213.513.8TL7702A 10TL7705A15− V TL7709A = 25°20V hysHysteresis, SENSE (V IT+ V IT−)TL7712A T A 25C35mVTL7715A45RESIN V I = 2.4 V to V CC 20V I = 0.4 V−100I I Input currentSENSETL7702AV ref < V I < V CC − 1.5 V 0.52µAI OH High-level output current, RESET V O = 18 V 50µA I OL Low-level output current, RESET V O = 0−50µA I CCSupply currentAll inputs and outputs open1.83mA †All electrical characteristics are measured with 0.1-µF capacitors connected at REF, CT, and V CC to GND.TL7702A, TL7705A, TL7709A, TL7712A, TL7715ASUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20095POST OFFICE BOX 655303 •DALLAS, TEXAS 75265switching characteristics over recommended operating conditions (unless otherwise noted)TEST CONDITIONS TL77xxAC TL77xxAI PARAMETER†MIN TYP MAX UNIT Output pulse duration C T = 0.1 µF0.65 1.22.6msec Input pulse duration at RESIN0.4µs t w(S)Pulse durationat SENSE input to switch outputs V IH = V IT− + 200 mV,V IL = V IT− − 200 mV2µs t pd Propagation delay time, RESIN to RESET V CC = 5 V 1µs Rise time RESET 5V See Note 50.2t r Rise timeRESET V CC = 5 V,See Note 53.5µs Fall time RESET 5VSee Note 5 3.5t fFall time RESETV CC = 5 V,See Note 50.2µs†All switching characteristics are measured with 0.1-µF capacitors connected at REF and V CC to GND.NOTE 5:The rise and fall times are measured with a 4.7-k Ω load resistor at RESET and RESET.PARAMETER MEASUREMENT INFORMATION0 V V IHV ILSENSERESETRESINRESETV OH(RESET)V OL(RESET)Figure 1. Voltage WaveformsTL7702A, TL7705A, TL7709A, TL7712A, TL7715A SUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20096POST OFFICE BOX 655303 •DALLAS, TEXAS 75265TYPICAL CHARACTERISTICS †Figure 2302622182463438ASSERTION TIMEvsLOAD RESISTANCE42810t − A s s e r t i o n T i m e − n sR L − Load Resistance − k ΩFigure 343210246t − D e a s s e r t i o n T i m e −56DEASSERTION TIMEvsLOAD RESISTANCE7810sµR L − Load Resistance − kΩFigure 43228242002550751001253640ASSERTION TIMEvsLOAD CAPACITANCE44150175200t − A s s e r t i o n T i m e − n sC L − Load Capacitance − pFFigure 52.421.61.22.83.2DEASSERTION TIMEvsLOAD CAPACITANCE3.60255075100125150175200C L − Load Capacitance − pF0.8t − D e a s s e r t i o n T i m e −sµ†For proper operation, both RESET and RESET should be terminated with resistors of similar value. Failure to do so may cause unwanted plateauing in either output waveform during switching.TL7702A, TL7705A, TL7709A, TL7712A, TL7715ASUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20097POST OFFICE BOX 655303 •DALLAS, TEXAS 75265APPLICATION INFORMATIONSystem ResetΩ5 V 12 V−12 VGNDΩFigure 6. Multiple Power-Supply System Reset Generation5 VGNDC T (F )+t d (s )1.3 104Figure 7. Reset Controller for TMS7000 SystemTL7702A, TL7705A, TL7709A, TL7712A, TL7715A SUPPLY-VOLTAGE SUPERVISORSSLVS028I − APRIL 1983 − REVISED JULY 20098POST OFFICE BOX 655303 •DALLAS, TEXAS 75265APPLICATION INFORMATION5 VSystem RESETInputFigure 8. Eliminating Undefined States Using a P-Channel JFETSystem RESETV CCSENSE InputFigure 9. Eliminating Undefined States Using a pnp TransistorPACKAGING INFORMATIONOrderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)TL7702ACD ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702ACP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7702ACPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7702AID ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7702AIDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7702AIDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7702AIDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702AIDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702AIDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7702AIP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7702AIPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7702AMFKB OBSOLETE LCCC FK20TBD Call TI Call TI Samples Not Available TL7702AMJG OBSOLETE CDIP JG8TBD Call TI Call TI Samples Not AvailableAddendum-Page 1Orderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)TL7702AMJGB OBSOLETE CDIP JG8TBD Call TI Call TI Samples Not AvailableTL7705ACD ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7705ACPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7705ACPSLE OBSOLETE SO PS8TBD Call TI Call TI Replaced by TL7705ACPSRTL7705ACPSR ACTIVE SO PS82000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACPSRE4ACTIVE SO PS82000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705ACPSRG4ACTIVE SO PS82000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705AID ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7705AIDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7705AIDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7705AIDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705AIDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7705AIDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeAddendum-Page 29-Jul-2010Orderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)TL7705AIP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7705AIPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7709ACD ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7709ACDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7709ACDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7709ACDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7709ACDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7709ACDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7709ACP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7709ACPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7709AID OBSOLETE SOIC D8TBD Call TI Call TI Samples Not Available TL7709AIP OBSOLETE PDIP P8TBD Call TI Call TI Samples Not Available TL7712ACD ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7712ACDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7712ACDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase SamplesTL7712ACDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7712ACDRE4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7712ACDRG4ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7712ACP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office9-Jul-2010Orderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)TL7712ACPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales OfficeTL7712AID OBSOLETE SOIC D8TBD Call TI Call TI Replaced by TL7712ACD TL7712AIDR ACTIVE SOIC D82500Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Purchase Samples TL7712AIP OBSOLETE PDIP P8TBD Call TI Call TI Replaced by TL7712ACPTL7715ACD ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7715ACDE4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7715ACDG4ACTIVE SOIC D875Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM Contact TI Distributoror Sales OfficeTL7715ACP ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7715ACPE4ACTIVE PDIP P850Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type Contact TI Distributoror Sales Office TL7715AID OBSOLETE SOIC D8TBD Call TI Call TI Samples Not Available TL7715AIP OBSOLETE PDIP P8TBD Call TI Call TI Samples Not Available(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check /productcontent for the latest availability information and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.9-Jul-2010 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.TAPE AND REELINFORMATION *All dimensionsare nominal Device Package Type Package DrawingPinsSPQ Reel Diameter (mm)Reel Width W1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W (mm)Pin1Quadrant TL7702ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7702AIDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7705ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7705ACPSR SOPS 82000330.016.48.2 6.6 2.512.016.0Q1TL7705AIDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7709ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7712ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7712AIDR SOIC D 82500330.012.4 6.4 5.2 8-Jul-2011*All dimensionsare nominal DevicePackage Type Package Drawing Pins SPQ Length (mm)Width (mm)Height (mm)TL7702ACDRSOIC D 82500346.0346.029.0TL7702AIDRSOIC D 82500340.5338.120.6TL7705ACDRSOIC D 82500340.5338.120.6TL7705ACPSRSO PS 82000346.0346.033.0TL7705AIDRSOIC D 82500340.5338.120.6TL7709ACDRSOIC D 82500340.5338.120.6TL7712ACDRSOIC D 82500340.5338.120.6TL7712AIDR SOIC D 82500340.5338.120.6 8-Jul-2011IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,modifications,enhancements,improvements, and other changes to its products and services at any time and to discontinue any product or service without notice.Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty.Testing and 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电源监控芯片TL7705AIDR_PDF_C53106_2015-07-13
ProductFolderSample &BuyTechnical Documents Tools &SoftwareSupport &CommunityTL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J –APRIL 1983–REVISED JANUARY 2015TL77xxA Supply-Voltage Supervisors1Features3DescriptionThe TL77xxA family of integrated-circuit supply-•Power-On Reset Generatorvoltage supervisors is designed specifically for use as •Automatic Reset Generation After Voltage Drop reset controllers in microcomputer and •Wide Supply-Voltage Range microprocessor systems.The supply-voltage supervisor monitors the supply for undervoltage •Precision Voltage Sensorconditions at the SENSE input.During power up,the •Temperature-Compensated Voltage Reference output becomes active (low)when V CC •Externally Adjustable Pulse Durationattains a value approaching 3.6V.At this point (assuming that SENSE is above V IT+),the delay timer 2Applicationsfunction activates a time delay,after which outputs and RESET go inactive (high and low,•Computers respectively).When an undervoltage condition occurs •Tabletsduring normal operation,and RESET go •Smart Phones active.•ServersDevice Information (1)•Music PlayersPART NUMBER PACKAGE BODY SIZE (NOM)SOIC (8) 4.90mm ×3.91mm TL77xxAPDIP (8)9.81mm ×6.35mm(1)For all available packages,see the orderable addendum atthe end of the datasheet.4Three-Supply MonitoringTL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED Table of Contents9.2Functional Block Diagram (8)1Features (1)9.3Feature Description (9)2Applications (1)9.4Device Functional Modes (9)3Description (1)10Application and Implementation (10)4Three-Supply Monitoring (1)10.1Application Information (10)5Revision History (2)10.2Typical Application (10)6Pin Configuration and Functions (3)10.3System Examples (12)7Specifications (4)11Power Supply Recommendations (14)7.1Absolute Maximum Ratings (4)12Layout (14)7.2ESD Ratings (4)12.1Layout Guidelines (14)7.3Recommended Operating Conditions (4)12.2Layout Example (14)7.4Thermal Information (5)13Device and Documentation Support (15)7.5Electrical Characteristics (5)13.1Related Links (15)7.6Switching Characteristics (6)13.2Trademarks (15)7.7Typical Characteristics (6)13.3Electrostatic Discharge Caution (15)8Parameter Measurement Information (7)13.4Glossary (15)9Detailed Description (8)14Mechanical,Packaging,and Orderable9.1Overview (8)Information (16)5Revision HistoryChanges from Revision I(July2009)to Revision J Page •Added Applications,Device Information table,Pin Functions table,ESD Ratings table,Thermal Information table, Typical Characteristics,Feature Description section,Device Functional Modes,Application and Implementationsection,Power Supply Recommendations section,Layout section,Device and Documentation Support section,and Mechanical,Packaging,and Orderable Information section (1)•Deleted Ordering Information table (1)2Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY20156Pin Configuration and FunctionsPin FunctionsPINTYPE DESCRIPTIONNAME NO.CT3I/O External timing-capacitor pinGND4—Device groundREF1O Voltage reference outputRESET6O Supervisor reset signal outputRESET5O Supervisor reset signal output(inverted)RESIN2I Reset inputSENSE7I Sense inputV CC8—Power SupplyCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback3TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 7Specifications7.1Absolute Maximum Ratingsover operating free-air temperature range(unless otherwise noted)(1)MIN MAX UNITV CC Supply Voltage(2)20VV I Input Voltage Range,RESIN–0.320VTL7702A(3)–0.36VTL7705A–0.320VV I Input Voltage Range SENSETL7709A–0.320VTL7712A,TL7715A–0.320VI OH High-level output current,I OH,RESET–30mAI OL Low-level output current,I OL,RESET30mAT J Operating virtual junction temperature150°CT stg Storage temperature range–65150°C(1)Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.These are stress ratingsonly,which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.(2)For proper operation of the TL7702A,the voltage applied to the SENSE terminal should not exceed V CC−1V or6V,whichever is less(3)All voltage values are with respect to GND.7.2ESD RatingsVALUE UNITHuman body model(HBM),per ANSI/ESDA/JEDEC JS-001,all pins(1)1000V(ESD)Electrostatic discharge VCharged device model(CDM),per JEDEC specification JESD22-C101,1000all pins(2)(1)JEDEC document JEP155states that500-V HBM allows safe manufacturing with a standard ESD control process.(2)JEDEC document JEP157states that250-V CDM allows safe manufacturing with a standard ESD control process.7.3Recommended Operating Conditionsover operating free-air temperature range(unless otherwise noted)MIN MAX UNITV CC Supply Voltage 3.518VV IH High-level input voltage at RESIN2VV IL Low-level input voltage at RESIN0.6VTL7702A0See(1)TL7705A010V I Input voltage,SENSE TL7709A015VTL7712A020TL7715A020I OH High-level output current,RESET–16mAI OL Low-level output current,RESET16mATL77xxAC070T A Operating free-air temperature°CTL77xxAI–4085(1)For proper operation of the TL7702A,the voltage applied to the SENSE terminal should not exceed V CC−1V or6V,whichever is less. 4Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY20157.4Thermal InformationTL77xxATHERMAL METRIC(1)D P PS UNIT8PINS8PINS8PINSRθJA Junction-to-ambient thermal resistance978595°C/W (1)For more information about traditional and new thermal metrics,see the IC Package Thermal Metrics application report,SPRA953.7.5Electrical Characteristicsover operating free-air temperature range(unless otherwise noted)TL77xxACTL77xxAIPARAMETER TEST CONDITIONS(1)UNITMIN TYP MAXV OH High-level output voltage,RESET I OH=–16mA V CC–1.5VV OL Low-level output voltage,RESET I OL=16mA0.4VV ref Reference Voltage T A=25°C 2.48 2.53 2.58VTL7702A 2.48 2.53 2.58TL7705A 4.5 4.55 4.6Negative-going inputV IT–TL7709A T A=25°C7.57.67.7V threshold voltage,SENSETL7712A10.610.811TL7715A13.213.513.8TL7702A10TL7705A15Hysteresis,SENS(V IT+–V hys TL7709A T A=25°C20mV V IT–)TL7712A35TL7715A45V I=2.4V to V CC20RESINI I Input current V I=0.4V–100µASENSE TL7702A V ref<V I<V CC–1.5V0.52I OH High-level output current,RESET V O=18V50µAI OL Low-level output current,RESET V O=0–50µAI CC Supply current All inputs and outputs open 1.83mA(1)All electrical characteristics are measured with0.1-µF capacitors connected at REF,CT,and V CC to GND. Array Figure1.Timing DiagramCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback5TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 7.6Switching Characteristicsover operating free-air temperature range(unless otherwise noted)TL77xxACTL77xxAIPARAMETER TEST CONDITIONS(1)UNITMIN TYP MAX Output pulse duration CT=0.1µF0.65 1.2 2.6msecInput pulse duration at RESIN0.4µsPulse duration at sense input to switch V IH=V IT−+200mV,V IL=V IT−−200t w(S)2µs outputs mVt pd propagation delay time,RESIN to RESET V CC=5V1µsRESET0.2t r Rise time V CC=5V(2)µsRESET 3.5RESET 3.5t f Fall time V CC=5V(2)µsRESET0.2(1)All switching characteristics are measured with0.1-µF capacitors connected at REF and V CC to GND.(2)The rise and fall times are measured with a4.7-kΩload resistor at RESET and7.7Typical Characteristics6Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY20158Parameter Measurement InformationFigure6.Voltage WaveformCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback7TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 9Detailed Description9.1OverviewThe TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically for use as reset controllers in microcomputer and microprocessor systems.The supply-voltage supervisor monitors the supply for undervoltage conditions at the SENSE input.During power up,the output becomes active(low)when V CC attains a value approaching3.6V.At this point(assuming that SENSE is above V IT+),the delay timer function activates a time delay,after which outputs and RESET go inactive(high and low,respectively). When an undervoltage condition occurs during normal operation,RESET and RESET go active.To ensure that a complete reset occurs,the reset outputs remain active for a time delay after the voltage at the SENSE input exceeds the positive-going threshold value.During power down and when SENSE is below V IT−,the outputs remain active until V CC falls below2V.After this,the outputs are undefined.An external capacitor(typically0.1μF)must be connected to REF to reduce the influence of fast transients in the supply voltage.Five versions of this circuit are available:•TL7705A(Vt=4.55V):Application in TTL-systems and microcomputer systems which require a5volt supply(e.g.TMS7000)•TL7709A(Vt=7.6V):Application in microcomputer systems using the TMS1XXXNLL•TL7712A(Vt=10.8V):Application in CMOS,microprocessor,and memory circuits with a12volt supply.•TL7715A(Vt=13.5V):Application in circuits which operate with a supply voltage of15V,as is found often in analog circuits.•TL7702A(Vt=2.5V):Application in systems where other supply voltages are used.The required trigger level my be adjusted with an external resistor divider at the SENSE input.9.2Functional Block DiagramThe functional block diagram is shown for illustrative purposes only;the actual circuit includes a trimming network to adjust the reference voltage and sense-comparator trip point.A.TL7702A:R1=0Ω,R2=openTL7705A:R1=7.8kΩ,R2=10kΩTL7709A:R1=19.7kΩ,R2=10kΩTL7712A:R1=32.7kΩ,R2=10kΩTL7715A:R1=43.4kΩ,R2=10kΩB.Resistor values shown are nominal.8Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY20159.3Feature Description9.3.1Wide Supply-Voltage RangeTh TL77xxA family operates of a wide supply voltage range of3.5V to18V.9.3.2Externally Adjustable Pulse DurationThe time delay is determined by the value of the external capacitor C T:t d=1.3×104×C T,where C T is in farads(F)and t d is in seconds(s).9.3.3Temperature-Compensated Voltage ReferenceThe series TL77xxA incorporates an extremely stable reference voltage source.This voltage source can also be used in applications where a constant voltage source is required.The reference voltage varies less than10mV over the supply voltage range of3.5V to18V.The same stability of the reference voltage is maintained,when the ambient temperature is changed.The reference's voltage varies only16mV when the ambient temperature is changed from-40°C to85°C.9.4Device Functional ModesFigure7shows the timing of the various signals.In this example the SENSE input is connected to the supply voltage V CC as in typical applications of this device.The minimum supply voltage for which the function of this device is guaranteed is3.6V.After power-on,the outputs are undefined until the minimum supply voltage V res is reached.For the TL77xxA the minimum supply voltage is Vres=3.0V(typical2.5V).Beyond the voltage V res the capacitor C T is first kept discharged,and the outputs stay in the active state(RESET=High,=Low). When the input voltage becomes higher than the threshold voltage V t,the thyristor is turned off and the capacitor is charged.After a delay,t d,the voltage at the capacitor passes the trigger level of the output comparator and the outputs become inactive.The circuit to be initialized is now set to a defined state and starts the correct operation.A.Note:SENSE Input connected to V CCFigure7.Timing DiagramCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback9=TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J –APRIL 1983–REVISED JANUARY 201510Application and ImplementationNOTEInformation in the following applications sections is not part of the TI component specification,and TI does not warrant its accuracy or completeness.TI’s customers are responsible for determining suitability of components for their purposes.Customers should validate and test their design implementation to confirm system functionality.10.1Application InformationThis application shows the initialization circuit diagrams for a microprocessor system with supply voltage Vcc =5V.The external components required are the decoupling capacitor C ref for the reference voltage and the timing capacitor C T .The outputs of the TL77xxA are open collector outputs.In Figure 8therefore a pull-up resistor is shown at the output to ensure the correct HIGH level.10.2Typical ApplicationFigure 8.Reset Controller Schematic for a Microprocessor10.2.1Design Requirements•5-V microprocessor supply voltage •t d =1.3ms10.2.2Detailed Design Procedure•Select reasonable values for pull-up/pull-down resistors for RESET and RESET.This design will use 10k Ω.•Choose C T =0.1µF to achieve t d =1.3ms•This design will use only the active-low reset output because the example microcontroller resets when the input is Low.10Submit Documentation Feedback Copyright ©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY2015Typical Application(continued)10.2.3Application CurvesCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback11TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 10.3System ExamplesFigure13.Multi Power-Supply System Reset Generation SchematicFigure14.Eliminating Undefined States Using a P-Channel JFET Schematic12Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY2015System Examples(continued)Figure15.Eliminating Undefined States Using PNP Transistor SchematicCopyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback131 2 3 48 7 6 5TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 11Power Supply RecommendationsThe TL77xxA devices will operate within the above specifications between3.5V and18V.These devices will risk being damaged when powered by more than20V.12Layout12.1Layout GuidelinesThe voltage monitor should be placed on the printed circuit board,where there are no neighboring circuits in the which switch high currents(like bus interface circuits and power switches).When laying out the layout of the printed circuit board special care should taken with the interconnects which carry analog signals.Beside the SENSE input these are the C T and V ref terminals.Noise coupled into the C T input will lead to a reduction of the output pulse width.Noise coupled into the V ref input or into the filter capacitor at this input may lead to undesired triggering of the circuit and by this to an undesired RESET pulse.Practice shows,that this malfunction when high currents flow over the interconnects of these capacitors to the GND terminal of the voltage monitor.To avoid these effects,the GND terminals of these capacitors must be connected by the shortest way to the GND terminal of the voltage monitor in so that no currents caused by other circuits flow over these wires.Figure16show a layout proposal for the printed circuit board.Furthermore the resistors of the voltage divider at the SENSE input of the TL7702(R2and R3in Figure16)have to be placed in so,that no noise may be coupled into this circuit. 12.2Layout ExampleFigure16.Printed Circuit Layout for the Supply Voltage Supervisor14Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedTL7702A,TL7705A,TL7709A,TL7712A,TL7715A SLVS028J–APRIL1983–REVISED JANUARY201513Device and Documentation Support13.1Related LinksThe table below lists quick access links.Categories include technical documents,support and community resources,tools and software,and quick access to sample or buy.Table1.Related LinksTECHNICAL TOOLS&SUPPORT& PARTS PRODUCT FOLDER SAMPLE&BUYDOCUMENTS SOFTWARE COMMUNITY TL7702A Click here Click here Click here Click here Click here TL7705A Click here Click here Click here Click here Click here TL7709A Click here Click here Click here Click here Click here TL7712A Click here Click here Click here Click here Click here TL7715A Click here Click here Click here Click here Click here 13.2TrademarksAll trademarks are the property of their respective owners.13.3Electrostatic Discharge CautionThese devices have limited built-in ESD protection.The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.13.4GlossarySLYZ022—TI Glossary.This glossary lists and explains terms,acronyms,and definitions.Copyright©1983–2015,Texas Instruments Incorporated Submit Documentation Feedback15TL7702A,TL7705A,TL7709A,TL7712A,TL7715ASLVS028J–APRIL1983–REVISED 14Mechanical,Packaging,and Orderable InformationThe following pages include mechanical,packaging,and orderable information.This information is the most current data available for the designated devices.This data is subject to change without notice and revision of this document.For browser-based versions of this data sheet,refer to the left-hand navigation.16Submit Documentation Feedback Copyright©1983–2015,Texas Instruments IncorporatedPACKAGING INFORMATIONAddendum-Page 1Addendum-Page 2Addendum-Page 3(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check /productcontent for the latest availability information and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.Addendum-Page 4PACKAGE OPTION ADDENDUM28-Oct-2014 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.Addendum-Page 5TAPE AND REELINFORMATION *All dimensionsare nominal Device Package Type Package DrawingPinsSPQ Reel Diameter (mm)Reel Width W1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W (mm)Pin1Quadrant TL7702ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7702ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7702AIDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7705ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7705ACPSR SOPS 82000330.016.48.2 6.6 2.512.016.0Q1TL7705AIDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7709ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7712ACDR SOICD 82500330.012.4 6.4 5.2 2.18.012.0Q1TL7712AIDR SOIC D 82500330.012.4 6.4 5.2 28-Oct-2014*Alldimensions are nominal DevicePackage Type Package Drawing Pins SPQ Length (mm)Width (mm)Height (mm)TL7702ACDRSOIC D 82500340.5338.120.6TL7702ACDRSOIC D 82500367.0367.035.0TL7702AIDRSOIC D 82500340.5338.120.6TL7705ACDRSOIC D 82500340.5338.120.6TL7705ACPSRSO PS 82000367.0367.038.0TL7705AIDRSOIC D 82500340.5338.120.6TL7709ACDRSOIC D 82500340.5338.120.6TL7712ACDRSOIC D 82500340.5338.120.6TL7712AIDR SOIC D 82500340.5338.120.6 28-Oct-2014IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,enhancements,improvements and other changes to its semiconductor products and services per JESD46,latest issue,and to discontinue any product or service per JESD48,latest issue.Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.All semiconductor products(also referred to herein as“components”)are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its components to the specifications applicable at the time of sale,in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products.Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.Except where mandated by applicable law,testing of all parameters of each component is not necessarily performed.TI assumes no liability for applications assistance or the design of Buyers’products.Buyers are responsible for their products and applications using TI components.To minimize the risks associated with Buyers’products and applications,Buyers should provide adequate design and operating safeguards.TI does not warrant or represent that any license,either express or implied,is granted under any patent right,copyright,mask work right,or other intellectual property right relating to any combination,machine,or process in which TI components or services are rmation published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement e of such information may require a license from a third party under the patents or other intellectual property of the third party,or a license from TI under the patents or other intellectual property of TI.Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties,conditions,limitations,and notices.TI is not responsible or liable for such altered rmation of third parties may be subject to additional restrictions.Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.Buyer acknowledges and agrees that it is solely responsible for compliance with all legal,regulatory and safety-related requirements concerning its products,and any use of TI components in its applications,notwithstanding any applications-related information or support that may be provided by TI.Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures,monitor failures and their consequences,lessen the likelihood of failures that might cause harm and take appropriate remedial actions.Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications.In some cases,TI components may be promoted specifically to facilitate safety-related applications.With such components,TI’s goal is to help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and requirements.Nonetheless,such components are subject to these terms.No TI components are authorized for use in FDA Class III(or similar life-critical medical equipment)unless authorized officers of the parties have executed a special agreement specifically governing such use.Only those TI components which TI has specifically designated as military grade or“enhanced plastic”are designed and intended for use in military/aerospace applications or environments.Buyer acknowledges and agrees that any military or aerospace use of TI components which have not been so designated is solely at the Buyer's risk,and that Buyer is solely responsible for compliance with all legal and regulatory requirements in connection with such use.TI has specifically designated certain components as meeting ISO/TS16949requirements,mainly for automotive use.In any case of use of non-designated products,TI will not be responsible for any failure to meet ISO/TS16949.Products ApplicationsAudio /audio Automotive and Transportation /automotiveAmplifiers Communications and Telecom /communicationsData Converters Computers and Peripherals /computersDLP®Products Consumer Electronics /consumer-appsDSP Energy and Lighting /energyClocks and Timers /clocks Industrial /industrialInterface Medical /medicalLogic Security /securityPower Mgmt Space,Avionics and Defense /space-avionics-defense Microcontrollers Video and Imaging /videoRFID OMAP Applications Processors /omap TI E2E Community Wireless Connectivity /wirelessconnectivityMailing Address:Texas Instruments,Post Office Box655303,Dallas,Texas75265Copyright©2015,Texas Instruments Incorporated。
复位芯片7705ac
PACKAGING INFORMATIONOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)5962-88685012A OBSOLETE LCCC FK20TBD Call TI Call TI TL7702ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7702AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7702AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7702AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7705ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg TypeOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)(RoHS)TL7705ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705ACPSLE OBSOLETE SO PS8TBD Call TI Call TITL7705ACPSR ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACPSRE4ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7705AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7705AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7705AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7709ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7709ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7709AID OBSOLETE SOIC D8TBD Call TI Call TITL7709AIP OBSOLETE PDIP P8TBD Call TI Call TITL7712ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7712ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg TypeOrderable Device Status (1)PackageTypePackage Drawing Pins Package Qty Eco Plan (2)Lead/Ball Finish MSL Peak Temp (3)(RoHS)TL7712ACPE4ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7712AID OBSOLETE SOICD 8TBD Call TI Call TI TL7712AIP OBSOLETE PDIPP 8TBD Call TI Call TI TL7715ACD ACTIVE SOICD 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACDE4ACTIVE SOICD 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACP ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715ACPE4ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715AID OBSOLETE SOICD 8TBD Call TI Call TI TL7715AIPOBSOLETE PDIP P 8TBD Call TI Call TI (1)The marketing status values are defined as follows:ACTIVE:Product device recommended for new designs.LIFEBUY:TI has announced that the device will be discontinued,and a lifetime-buy period is in effect.NRND:Not recommended for new designs.Device is in production to support existing customers,but TI does not recommend using this part in a new design.PREVIEW:Device has been announced but is not in production.Samples may or may not be available.OBSOLETE:TI has discontinued the production of the device.(2)Eco Plan -The planned eco-friendly classification:Pb-Free (RoHS),Pb-Free (RoHS Exempt),or Green (RoHS &no Sb/Br)-please check /productcontent for the latest availability information and additional product content details.TBD:The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS):TI's terms "Lead-Free"or "Pb-Free"mean semiconductor products that are compatible with the current RoHS requirements for all 6substances,including the requirement that lead not exceed 0.1%by weight in homogeneous materials.Where designed to be soldered at high temperatures,TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1)lead-based flip-chip solderbumps used between 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tl7705a原理
tl7705a原理TL7705A是一款用于监控和保护电源系统的集成电路。
它集成了电源检测、过压保护、欠压保护、保持重置以及系统控制等功能，广泛应用于计算机、服务器、通讯设备、工控设备等领域。
本文将详细解析TL7705A的工作原理，并以条理清晰的方式进行阐述。
一、TL7705A的电源监控功能TL7705A主要用于监控电源电压的高低，并通过RESET引脚发送重置信号。
其工作原理如下：1.供电电压（VCC）输入：TL7705A根据VCC引脚输入的电压来监控供电系统。
2.过压保护功能：当VCC高于设定的阈值（通常为4.65V）时，TL7705A会将RESET引脚拉低并断开电源，从而保护后续电路不受损害。
3.欠压保护功能：当VCC低于设定的阈值（通常为4.3V）时，TL7705A会将RESET引脚拉低并断开电源，以防止系统不正常工作。
4.时间延迟功能：由于电源系统在启动时可能有瞬间的波动，TL7705A还具有时间延迟功能，可以防止过早或过晚地发送重置信号。
二、TL7705A的保持重置功能除了电源监控外，TL7705A还具备保持重置功能。
该功能能够保持RESET引脚在一定时间内保持低电平输出信号。
1.保持重置电路：TL7705A内部嵌入了一个充电电容和一个放电电阻组成的电路。
当VCC电压低于复位阀值时，这个电路开始运行。
2.重置时间：TL7705A允许用户通过外部电阻来调整重置时间。
当VCC重新达到阈值时，放电电阻会将充电电容快速放电，从而结束重置状态。
三、TL7705A的系统控制功能TL7705A还具备一些系统控制功能，用于实现更灵活的应用：1. POWER ON RESET（POR）：一般情况下，当VCC上升到阈值以上时，TL7705A会发送一个短暂的RESET脉冲来复位目标系统。
2.外部复位或手动复位：通过RESET引脚上的外部复位脉冲或手动复位按钮，可以随时启动复位操作。
3.低功耗模式（LP）：TL7705A可以通过控制输入引脚（LP引脚）进入低功耗模式，以降低功耗并延长电池寿命。
智能电表的抗干扰设计
智能电表的抗干扰设计The Design for Anti-Interference of Intelligent Electric Meter天津轻工业学院96信箱(天津 300222) 严新忠 [摘要]本文通过智能电表受电网干扰的实例,解决的方法,揭示了单片机受干扰的机理,介绍了如何验证各种抗干扰措施的效果,给出了智能电表有效的抗干扰方案。
[关键词]智能电表 单片机 抗干扰Abstract:Through an example of intelligent electric meter disturbed by electric-network and its solu2 tion,this paper reveals the reason why the single-chip was disturbed.It also introduces the effect of different anti-interference,and gives the effective anti-interference solution.K eyw ords:Intelligent electric meter Single-chip Anti-interference1 引言智能电表要求长年连续的挂网运行,运行中出现的任何异常现象(比如数据乱、死机等)均要求智能电表能自动恢复正常工作,其抗干扰要求很高。
在智能电表的研制初期,我们发现这么一种现象:电表带上电感性负载(比如电扇)时,在电扇快速插拔的瞬间,容易导致智能电表单片机系统数据丢失和死机。
电扇仅是普通家电,电网连接着千家万户,如果从设计上不能把智能电表的抗干扰问题解决好,后果会很严重。
2 硬件上的抗干扰措施电感性负载的快速切换为什么会导致单片机数据乱和死机?又如何加以解决?2.1分析受干扰时的电源电压波形在电感性负载快速切换的同时,观察电源电压各点的波形包括变压器次极、整流后电压和稳压后电压波形。
单片机掉电保护总结
单片机应用系统断电时的数据保护方法在测量、控制等领域的应用中，常要求单片机内部和外部RAM中的数据在电源掉电时不丢失，重新加电时，RAM中的数据能够保存完好，这就要求对单片机系统加接掉电保护电路。
掉电保护通常可采用以下三种方法：一是加接不间断电源，让整个系统在掉电时继续工作，二是采用备份电源，掉电后保护系统中全部或部分数据存储单元的内容；三是采用EEPROM来保存数据。
由于第一种方法体积大、成本高，对单片机系统来说，不宜采用。
第二种方法是根据实际需要，掉电时保存一些必要的数据，使系统在电源恢复后，能够继续执行程序，因而经济实用，故大量采用[1]。
EEPROM既具有ROM掉电不丢失数据的特点，又有RAM随机读写的特点。
但由于其读写速度与读写次数的限制，使得EEPROM 不能完全代替RAM。
下面将介绍最常用的一些掉电保护的处理方法，希望能对相关设计人员在实际工作中有所帮助。
？1简单的RAM数据掉电保护电路在具有掉电保护功能的单片机系统中，一般采用CMOS单片机和CMOSRAM。
CMOS型RAM存储器静态电源小，在正常工作状态下一般由电源向片外RAM供电，而在断电状态下由小型蓄电池向片外RAM供电，以保存有用数据，采用这种方法保存数据，时间一般在3－5个月[2]。
然而，系统在上电及断电过程中，总线状态的不确定性往往导致RAM内某些数据的变化，即数据受到冲失。
因此对于断电保护数据用的RAM存储器，除了配置供电切换电路外，还要采取数据防冲失措施，当电源突然断电时，电压下降有个过程，CPU在此过程中会失控，可能会误发出写信而冲失RAM中的数据，仅有电池是不能有效完成数据保护的，还需要对片选信号加以控制，保证整个切换过程中CS引脚的信号一直保持接近VCC。
通常，采用在RAM的CS和VCC引脚之间接一个电阻来实现COMSRAM的电源切换，然而，如果在掉电时，译码器的输出出现低电平，就可能出现问题，图1给出一种简单的电路设计，它能够避免上述问题的产生。
常用电源芯片及其参数（精）
常用电源芯片及其参数（精）常用电源的电源稳压器件如下: 79L05负5V稳压器79L06负6V稳压器79L08负8V稳压器79L09负9V稳压器79L12负12V稳压器79L15负15V稳压器79L18负18V稳压器79L24负24V稳压器LM1575T-3.33.3V简易开关电源稳压器(1ALM1575T-5.05V简易开关电源稳压器(1ALM1575T-1212V简易开关电源稳压器(1ALM1575T-1515V简易开关电源稳压器(1A LM1575T-ADJ 简易开关电源稳压器(1A可调1.23 to 37LM1575HVT-3.33.3V简易开关电源稳压器(1ALM1575HVT-5.0LM1575HVT-1212V简易开关电源稳压器(1ALM1575HVT-1515V简易开关电源稳压器(1ALM1575HVT-ADJ简易开关电源稳压器(1A可调1.23 to 37LM2575T-3.33.3V简易开关电源稳压器(1ALM2575T-5.05V简易开关电源稳压器(1ALM2575T-1212V简易开关电源稳压器(1ALM2575T-1515V简易开关电源稳压器(1ALM2575T-ADJ简易开关电源稳压器(1A可调1.23 to 37 LM2575HVT-3.3 3.3V简易开关电源稳压器(1ALM2575HVT-5.05V简易开关电源稳压器(1ALM2575HVT-1212V简易开关电源稳压器(1ALM2575HVT-1515V简易开关电源稳压器(1ALM2575HVT-ADJ简易开关电源稳压器(1A可调1.23 to 37 LM2576T-3.3 3.3V简易开关电源稳压器(3ALM2576T-5.05.0V简易开关电源稳压器(3ALM2576T-12LM2576T-1515V简易开关电源稳压器(3ALM2576T-ADJ简易开关电源稳压器(3A可调1.23V to 37V LM2576HVT-3.3 3.3V简易开关电源稳压器(3ALM2576HVT-5.05.0V简易开关电源稳压器(3ALM2576HVT-1212V简易开关电源稳压器(3ALM2576HVT-1515V简易开关电源稳压器(3ALM2576HVT-ADJ简易开关电源稳压器(3A可调1.23V to 37VLM2930T-5.05.0V低压差稳压器LM2930T-8.08.0V低压差稳压器LM2931AZ-5.05.0V低压差稳压器(TO-92LM2931T-5.05.0V低压差稳压器LM2931CT3V to 29V低压差稳压器(TO-220,5PIN LM2940CT-5.05.0V低压差稳压器LM2940CT-8.08.0V低压差稳压器LM2940CT-9.09.0V低压差稳压器LM2940CT-1010V低压差稳压器LM2940CT-1212V低压差稳压器LM2940CT-1515V低压差稳压器LM123K5V稳压器(3ALM323K5V稳压器(3ALM117K1.2V to 37V三端正可调稳压器(1.5A LM317LZ 1.2V to 37V三端正可调稳压器(0.1A LM317T 1.2V to 37V三端正可调稳压器(1.5A LM317K 1.2V to 37V三端正可调稳压器(1.5A LM133K 三端可调-1.2V to -37V稳压器(3.0A LM333K 三端可调-1.2V to -37V稳压器(3.0ALM337K三端可调-1.2V to -37V稳压器(1.5ALM337T三端可调-1.2V to -37V稳压器(1.5ALM337LZ三端可调-1.2V to -37V稳压器(0.1ALM150K三端可调1.2V to 32V稳压器(3ALM350K三端可调1.2V to 32V稳压器(3ALM350T三端可调1.2V to 32V稳压器(3ALM138K三端正可调1.2V to 32V稳压器(5ALM338T三端正可调1.2V to 32V稳压器(5ALM338K 三端正可调 1.2V to 32V 稳压器(5A LM336-2.5 2.5V 精密基准电压源LM336-5.0 5.0V 精密基准电压源LM385-1.2 1.2V 精密基准电压源 LM385-2.5 2.5V 精密基准电压源 LM399H 6.9999V 精密基准电压源 LM431ACZ 精密可调 2.5V to 36V 基准稳压源 LM723 高精度可调 2V to 37V 稳压器 LM105 高精度可调 4.5V to 40V 稳压器LM305 高精度可调4.5V to 40V 稳压器MC1403 2.5V 基准电压源MC34063 充电控制器 SG3524 脉宽调制开关电源控制器TL431 精密可调 2.5V to 36V 基准稳压源 TL494 脉宽调制开关电源控制器TL497 频率调制开关电源控制器TL7705 电池供电/欠压控制器7805 正 5V 稳压器(1A 7806 正 6V 稳压器(1A 7808 正 8V 稳压器(1A 7809 正 9V 稳压议（1A） 7812 正 12V 稳压器(1A 7815 正 15V 稳压器(1A 7818 正 18V 稳压器(1A 7824 正 24V 稳压器(1A 7905 负 5V 稳压器(1A7906 负 6V 稳压器(1A 7908 负 8V 稳压器(1A 7909 负 9V 稳压器（1A） 7912 负 12V 稳压器(1A 7915 负 15V 稳压器(1A 7918 负18V 稳压器(1A 7924 负 24V 稳压器(1A 78L05 正 5V 稳压器 78L06 正 6V 稳压器 78L08 正 8V 稳压器 78L09 正 9V 稳压器 78L12 正 12V 稳压器 78L15 正 15V 稳压器 78L18正 18V 稳压器 78L24 正 24V 稳压器。
电源型号一览
常用电源管理稳压IC型号(规格)器件简介相同型号79L05负5V稳压器(100ma)79L06负6V稳压器(100ma)79L08负8V稳压器(100ma)79L09负9V稳压器(100ma)79L12负12V稳压器(100ma)79L15负15V稳压器(100ma)79L18负18V稳压器(100ma)79L24负24V稳压器(100ma)LM1575T-3.3 3.3V简易开关电源稳压器(1A)LM1575T-5.05V简易开关电源稳压器(1A)LM1575T-1212V简易开关电源稳压器(1A)LM1575T-1515V简易开关电源稳压器(1A)LM1575T-ADJ简易开关电源稳压器(1A可调1.23 to 37)LM1575HVT-3.33.3V简易开关电源稳压器(1A)LM1575HVT-5.05V简易开关电源稳压器(1A)LM1575HVT-1212V简易开关电源稳压器(1A)LM1575HVT-1515V简易开关电源稳压器(1A)LM1575HVT-ADJ简易开关电源稳压器(1A可调1.23 to 37)LM2575T-3.33.3V简易开关电源稳压器(1A)LM2575T-5.05V简易开关电源稳压器(1A)LM2575T-1212V简易开关电源稳压器(1A)LM2575T-1515V简易开关电源稳压器(1A)LM2575T-ADJ简易开关电源稳压器(1A可调1.23 to 37) LM2575HVT-3.33.3V简易开关电源稳压器(1A)LM2575HVT-5.05V简易开关电源稳压器(1A)LM2575HVT-1212V简易开关电源稳压器(1A)LM2575HVT-1515V简易开关电源稳压器(1A)LM2575HVT-ADJ简易开关电源稳压器(1A可调1.23 to 37)LM2576T-3.33.3V简易开关电源稳压器(3A)LM2576T-5.05.0V简易开关电源稳压器(3A)LM2576T-1212V简易开关电源稳压器(3A)LM2576T-1515V简易开关电源稳压器(3A)LM2576T-ADJ简易开关电源稳压器(3A可调1.23V to 37V)LM2576HVT-3.33.3V简易开关电源稳压器(3A)LM2576HVT-5.05.0V简易开关电源稳压器(3A)LM2576HVT-1212V简易开关电源稳压器(3A)LM2576HVT-1515V简易开关电源稳压器(3A)LM2576HVT-ADJ简易开关电源稳压器(3A可调1.23V to 37V)LM2930T-5.05.0V低压差稳压器LM2930T-8.08.0V低压差稳压器LM2931AZ-5.05.0V低压差稳压器(TO-92)LM2931T-5.05.0V低压差稳压器LM2931CT3V to 29V低压差稳压器(TO-220,5PIN)LM2940CT-5.05.0V低压差稳压器LM2940CT-8.08.0V低压差稳压器LM2940CT-9.09.0V低压差稳压器LM2940CT-1010V低压差稳压器LM2940CT-1212V低压差稳压器LM2940CT-1515V低压差稳压器LM123K5V稳压器(3A)LM323K5V稳压器(3A)LM117K1.2V to 37V三端正可调稳压器(1.5A)LM317LZ1.2V to 37V三端正可调稳压器(0.1A)LM317T1.2V to 37V三端正可调稳压器(1.5A)LM317K1.2V to 37V三端正可调稳压器(1.5A)LM133K三端可调-1.2V to -37V稳压器(3.0A)LM333K三端可调-1.2V to -37V稳压器(3.0A)LM337K三端可调-1.2V to -37V稳压器(1.5A)LM337T三端可调-1.2V to -37V稳压器(1.5A)LM337LZ三端可调-1.2V to -37V稳压器(0.1A)LM150K三端可调1.2V to 32V稳压器(3A)LM350K三端可调1.2V to 32V稳压器(3A)LM350T三端可调1.2V to 32V稳压器(3A)LM138K三端正可调1.2V to 32V稳压器(5A)LM338T三端正可调1.2V to 32V稳压器(5A)LM338K三端正可调1.2V to 32V稳压器(5A)LM336-2.52.5V精密基准电压源LM336-5.05.0V精密基准电压源LM385-1.21.2V精密基准电压源LM385-2.52.5V精密基准电压源LM399H6.9999V精密基准电压源LM431ACZ精密可调2.5V to 36V基准稳压源LM723高精度可调2V to 37V稳压器高精度可调4.5V to 40V稳压器LM305高精度可调4.5V to 40V稳压器MC14032.5V基准电压源MC34063充电控制器SG3524脉宽调制开关电源控制器TL431精密可调2.5V to 36V基准稳压源TL494脉宽调制开关电源控制器TL497频率调制开关电源控制器TL7705电池供电/欠压控制器7805正5V稳压器(1A)7806正6V稳压器(1A)7808正8V稳压器(1A)7809正9V稳压议（1A）7812正12V稳压器(1A)7815正15V稳压器(1A)7818正18V稳压器(1A)7824正24V稳压器(1A)7905负5V稳压器(1A)7906负6V稳压器(1A)7908负8V稳压器(1A)7909负9V稳压器（1A）7912负12V稳压器(1A)7915负15V稳压器(1A)7918负18V稳压器(1A)7924负24V稳压器(1A)。
单片机掉电保护总结完整版
单片机掉电保护总结Document serial number【NL89WT-NY98YT-NC8CB-NNUUT-NUT108】单片机应用系统断电时的数据保护方法在测量、控制等领域的应用中，常要求单片机内部和外部RAM中的数据在电源掉电时不丢失，重新加电时，RAM中的数据能够保存完好，这就要求对单片机系统加接掉电保护电路。
掉电保护通常可采用以下三种方法：一是加接不间断电源，让整个系统在掉电时继续工作，二是采用备份电源，掉电后保护系统中全部或部分数据存储单元的内容；三是采用EEPROM来保存数据。
由于第一种方法体积大、成本高，对单片机系统来说，不宜采用。
第二种方法是根据实际需要，掉电时保存一些必要的数据，使系统在电源恢复后，能够继续执行程序，因而经济实用，故大量采用[1]。
EEPROM既具有ROM掉电不丢失数据的特点，又有RAM随机读写的特点。
但由于其读写速度与读写次数的限制，使得EEPROM 不能完全代替RAM。
下面将介绍最常用的一些掉电保护的处理方法，希望能对相关设计人员在实际工作中有所帮助。
1简单的RAM数据掉电保护电路在具有掉电保护功能的单片机系统中，一般采用CMOS单片机和CMOSRAM。
CMOS 型RAM存储器静态电源小，在正常工作状态下一般由电源向片外RAM供电，而在断电状态下由小型蓄电池向片外RAM供电，以保存有用数据，采用这种方法保存数据，时间一般在3－5个月[2]。
然而，系统在上电及断电过程中，总线状态的不确定性往往导致RAM内某些数据的变化，即数据受到冲失。
因此对于断电保护数据用的RAM存储器，除了配置供电切换电路外，还要采取数据防冲失措施，当电源突然断电时，电压下降有个过程，CPU在此过程中会失控，可能会误发出写信而冲失RAM中的数据，仅有电池是不能有效完成数据保护的，还需要对片选信号加以控制，保证整个切换过程中CS引脚的信号一直保持接近VCC。
通常，采用在RAM的CS和VCC引脚之间接一个电阻来实现COMSRAM的电源切换，然而，如果在掉电时，译码器的输出出现低电平，就可能出现问题，图1给出一种简单的电路设计，它能够避免上述问题的产生。
TL7705 芯片手册
PACKAGING INFORMATIONOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)5962-88685012A OBSOLETE LCCC FK20TBD Call TI Call TI TL7702ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7702AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7702AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7702AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7705ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg TypeOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)(RoHS)TL7705ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705ACPSLE OBSOLETE SO PS8TBD Call TI Call TITL7705ACPSR ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACPSRE4ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7705AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7705AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7705AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7709ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7709ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7709AID OBSOLETE SOIC D8TBD Call TI Call TITL7709AIP OBSOLETE PDIP P8TBD Call TI Call TITL7712ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7712ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg TypeOrderable Device Status (1)PackageTypePackage Drawing Pins Package Qty Eco Plan (2)Lead/Ball Finish MSL Peak Temp (3)(RoHS)TL7712ACPE4ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7712AID OBSOLETE SOICD 8TBD Call TI Call TI TL7712AIP OBSOLETE PDIPP 8TBD Call TI Call TI TL7715ACD ACTIVE SOICD 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACDE4ACTIVE SOICD 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACP ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715ACPE4ACTIVE PDIPP 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715AID OBSOLETE SOICD 8TBD Call TI Call TI TL7715AIPOBSOLETE PDIP P 8TBD Call TI Call TI (1)The marketing status values are defined as follows:ACTIVE:Product device recommended for new designs.LIFEBUY:TI has announced that the device will be discontinued,and a lifetime-buy period is in effect.NRND:Not recommended for new designs.Device is in production to support existing customers,but TI does not recommend using this part in a new design.PREVIEW:Device has been announced but is not in production.Samples may or may not be available.OBSOLETE:TI has discontinued the production of the device.(2)Eco Plan -The planned eco-friendly classification:Pb-Free (RoHS),Pb-Free (RoHS Exempt),or Green (RoHS &no Sb/Br)-please check /productcontent for the latest availability information and additional product content details.TBD:The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS):TI's terms "Lead-Free"or "Pb-Free"mean semiconductor products that are compatible with the current RoHS requirements for all 6substances,including the requirement that lead not exceed 0.1%by weight in homogeneous materials.Where designed to be soldered at high temperatures,TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1)lead-based flip-chip solderbumps used between the die and package,or 2)lead-based die adhesive used between the die and leadframe.The component is otherwise considered Pb-Free (RoHS compatible)as defined above.Green (RoHS &no Sb/Br):TI defines "Green"to mean Pb-Free (RoHS compatible),and free of Bromine (Br)and Antimony (Sb)based flame retardants (Br or Sb do not exceed 0.1%by weight in homogeneous material)(3)MSL,Peak Temp.--The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications,and peak solder temperature.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.TI bases its knowledge and belief on information provided by third parties,and makes no representation or warranty as to the accuracy of such information.Efforts are underway to better integrate information from third parties.TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have 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节能型冷库温度测控系统设计
节能型冷库温度测控系统设计摘要：本文针对大型冷库的节能问题及其温度测控系统的设计要求，提出以台式机与89s51单片机构成集散式温度测控系统的设计方案，阐述了利用单片机控制多个模拟开关构成的测控网，对各个冷间采用多点温度实时检测，精确控制温度，降低能耗的方法。
关键词：计算机 89s51单片机模拟开关一、引言大型冷库如何更好地保证储存货物的质量，减少制冷系统不必要的能耗，对冷库冷间温度的检测与控制是重要环节之一。
由于大型冷库每个冷间的温度决定着制冷系统的蒸发温度，而制冷系统的蒸发温度每降低1℃，其螺旋杆式压缩机的制冷量会降低4%～5%。
虽然螺杆式制冷压缩机的轴功率只是略有下降，但螺旋杆式压缩机的能效比cop却有明显的降低。
依据ts16949质量管理体系，经cop 分析，知系统节能降耗创造价值的过程中，除科学选择建筑形式和材料外，必须防止冷间温度大起大落，严格控制冷间温度在给定温度的很小范围内波动。
本系统力求温度控制在给定温度的±0.5℃范围内工作，实现节能降耗。
下面分硬、软两部分介绍本系统的设计与构成。
二、硬件系统设计由于冷间体积大，存放的货物多，进出货较频繁，不同位置的货物温度是不同的，因此本设计采用模拟开关构成测控网，在温度测控过程中，对每个冷间进行八点温度实时检测和计算处理，最大限度地提高多点温度检测和控制的精度。
系统采用台式机作为该集散系统的上位机，通过rs-485串行总线与各冷间中的前置机相连，前置机以89c51单片机为控制核心，主要由a/d转换器、温度传感器、电源电压监测和看门狗、串行通信接口等电路组成，通过控制模拟开关的切换，分时检测安装在冷间不同位置的8个温度传感器测得的温度，实现智能多点温度测控。
1.温度传感器电路的设计系统使用ds18b20半导体温度传感器，它以pn结作为敏感元件，具有反应快、价格低等特点。
在正常工作时输入端须设置为恒流偏置，其工作电流在200ua左右。
赛默飞Thermo离心机售后维修
赛默飞Thermo离心机售后维修Thermo离心机故障现象一开启离心机电源开关后,机器不启动,显示面板所有显示均不亮,但机内12V、5V 直流电源电压正常。
故障分析因离心机电源开启后,首先进行初始化过程,对核心电路进行检测,若初始化过程出现问题,则处于停机状态进入死循环,根据故障现象可初步判断该机没有进行初始化过程,导致没有初始化过程的主要原因有:(1)控制板上的微处理器upd7810未复位;(2)没有时钟信号;(3)ROM中程序损坏;(4)微处理器upd7810损坏检修方法在检修过程中应采取先易后难的原则,首先检查微处理的复位情况。
用低电平信号瞬间送到微处理器upd7810的28脚复位端机器开启,进入正常工作状态,显示面板亦工作正常,这说明故障发生在复位电路。
由于机器工作一段时间后,元器件的性能发生变化,导致产生的复位脉冲不符合要求(正常复位脉冲约十几ns)重新调整复位电路中的电容C3后,机器工作正常。
如Z11、TL7705集成块损坏,在购不到的情况下,亦可直接用一个积分电路r=RC>12ns代替。
Thermo离心机故障现象二开机后,在转子升速时当转速达到830r/min左右时,转子报警灯闪亮,转子停止升速,进入自由衰减状态。
故障分析造成此类故障现象的主要原因在转子转速检测电路。
如RPG(转子脉冲发生器)传感器坏;晶体管衰老、特性变坏、电流放大系数下降或电阻变值都是造成此类故障的原因。
检修方法查RPGA点脉冲信号约3Vp—p,而且脉冲宽度随转速的升高而改变,这说明RPG传感器工作正常,晶体管Q4集电极、Z32输入端均为2.8Vp—p脉冲信号,Z32的输出端为+5V直流电平(正常时应为5Vp—p的脉冲信号)。
因Z32的阈值电压在3V左右,故输入的2.8Vp—p脉冲不能使反相器打开,此时微处理的检测状态不对,转子报警灯闪亮。
查Q4集电极电流低于正常值,在Q4衰老不太严重的情况下,将Q4的输出电压提常高即可,也就是将集电极电阻R31减小一些,提高集电极电流,使Q4达到饱和导通,集电极输出约5Vp—p脉冲信号机器恢复正常工作。
单片机应用系统断电时的数据保护方法
单片机应用系统断电时的数据保护方法在测量、控制等领域的应用中，常要求单片机内部和外部RAM中的数据在电源掉电时不丢失，重新加电时，RAM中的数据能够保存完好，这就要求对单片机系统加接掉电保护电路。
掉电保护通常可采用以下三种方法：一是加接不间断电源，让整个系统在掉电时继续工作，二是采用备份电源，掉电后保护系统中全部或部分数据存储单元的内容；三是采用EEPROM来保存数据。
由于第一种方法体积大、成本高，对单片机系统来说，不宜采用。
第二种方法是根据实际需要，掉电时保存一些必要的数据，使系统在电源恢复后，能够继续执行程序，因而经济实用，故大量采用[1]。
EEPROM既具有ROM掉电不丢失数据的特点，又有RAM随机读写的特点。
但由于其读写速度与读写次数的限制，使得EEPROM不能完全代替RAM。
下面将介绍最常用的一些掉电保护的处理方法，希望能对相关设计人员在实际工作中有所帮助。
1 简单的RAM数据掉电保护电路在具有掉电保护功能的单片机系统中，一般采用CMOS单片机和CMOS RAM。
CMOS型RAM存储器静态电源小，在正常工作状态下一般由电源向片外RAM供电，而在断电状态下由小型蓄电池向片外RAM供电，以保存有用数据，采用这种方法保存数据，时间一般在3－5个月[2]。
然而，系统在上电及断电过程中，总线状态的不确定性往往导致RAM内某些数据的变化，即数据受到冲失。
因此对于断电保护数据用的RAM存储器，除了配置供电切换电路外，还要采取数据防冲失措施，当电源突然断电时，电压下降有个过程，CPU在此过程中会失控，可能会误发出写信而冲失RAM中的数据，仅有电池是不能有效完成数据保护的，还需要对片选信号加以控制，保证整个切换过程中CS引脚的信号一直保持接近VCC。
通常，采用在RAM的CS和VCC引脚之间接一个电阻来实现COMS RAM的电源切换，然而，如果在掉电时，译码器的输出出现低电平，就可能出现问题，图1给出一种简单的电路设计，它能够避免上述问题的产生。
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TL7700A SeriesAugust 1996SUPPLY VOLTAGE SUPERVISORS.POWER-ON RESET GENERATOR.AUTOMATIC RESET GENERATION AFTER VOLTAGEDROP.WIDE SUPPLY VOLTAGE RANGE ...3V TO 18V.PRECISION VOLTAGE SENSOR.TEMPERATURE-COMPENSATED VOLTAGE REFERENCE.TRUE AND COMPLEMENT RESET OUTPUTS .EXTERNALLY ADJUSTABLE PULSE WIDTHN MinidipDESCRIPTIONThe TL7700Aseriesaremonolithicintegratedcircuit supplyvoltagesupervisorsspecificallydesi-gnedfor use as reset controllers in microcomputer and mi-croprocessor systems.During power-up the device tests the supply voltage and keeps the RESET and RESET outputs active (high and low,respectively)as long as the supply voltage has not reached its nominal voltage value.Taking RESIN low has the same effect.To ensurethatthe microcomputersys-tem hasreset,theTL7700Athen initiatesaninternal time delaythat delays the returnof the reset outputs to theirinactivestates.Since the timedelay for most microcomputersandmicroprocessorsis in theorder of several machine cycles,the device internal time delay is determined by an external time delay is de-termined by an external capacitor connected to the C T input (pin 3).t d =1.3x 104x C TWhere :C T is in farads (F)and t d in seconds (s).In addition,when the supply voltage drops below the nominal value,the outputs will be active until the supply voltage returns to the nominal value.An ex-ternalcapacitor(typically0.1µF)mustbe connected to the REF output (pin 1)to reduce the influence of fast transients in the supply voltage.The TL7700AI series is characterized for operation from –25o C to 85o C ;the TL7700AC series is char-acterized from 0o C to 70o C.D SO8ORDERING NUMBERSTemperature RangeMinidip S080to 70o C TL77XXACP TL77XXACD -25to 85o CTL77XXAIPTL77XXAIDPIN CONNECTION (top view)1/7*TL7702A R1=0Ω,R2=open;TL7705A R1=7.8KΩ,R2=10kΩ;TL7709A R1=19.7KΩ,R2=10kΩ;TL7712A R1=32.7kΩ,R2=10kΩ;TL7715A R1=43.4KΩ,R2=10kΩ.BLOCK DIAGRAMABSOLUTE MAXIMUM RATINGSSymbol Parameter Value Unit V S Supply Voltage,V CC-(see note1)20V V i Input Voltage Range at RESIN-0.3to20VV i Input Voltage at SENSE:TL7702A(see note2)TL7705ATL7709ATL7712ATL7715A-0.3to6-0.3to10-0.3to15-0.3to20-0.3to20VI OH High-level Output Current at RESET-30mA I OL Low-level Output Current at RESET30mAT amb Operating Free-air Temperature Range:TL77XXAITL77XXAC -25to850to70o CT stg Storage Temperature Range-65to150o C Notes: 1.All voltage values are with respect to the network groun d terminal2.For the TL7700A,the voltage applied to the SENSE terminal must never exceed V s.THERMAL DATASymbol Parameter Value Unit R th j-amb Thermal Resistance Junction-ambient Max.120o C/WRECOMMENDED OPERATING CONDITIONSSymbol Parameter Min.Max.Unit V S Supply Voltage 3.618V V IH High-level Input Voltage at RESIN2V V IL Low-level Input Voltage at RESIN0.6VV i Voltage at Sense Input TL7702ATL7705ATL7709ATL7712ATL7715A 0See note310152020VI OH High-level Output Current at RESET-16mA I OL Low-level Output Current at RESET16mAT amb Operating Free-air Temperature Range TL77-AITL77-AC -258570o CNote: 3.For proper operation of the TL7702A,the voltage applied to the SENSE terminal should not exceed V s-1V or6V,which ever is less. TL7700A Series2/7ELECTRICAL CHARACTERISTICS t hese specifications unless otherwise specified,apply for:T amb=–25to85o C(TLXXAI),T amb=0to70o C(TL77XXAC)Symbol Parameter Test Conditions(1)Min.Typ.Max.Unit V OH High-level Output Voltage at RESET I OH=–16mA V s-1.5V V OL Low-Level Output Voltage at RESET I OL=16mA0.4V V ref Reference Voltage T amb=25o C 2.48 2.53 2.58VV T Threshold Voltage at SENSE Input TL7702ATL7705ATL7709ATL7712ATL7715A V s=3.6V to18VT amb=25o C2.484.57.510.613.22.534.557.610.813.52.584.67.71113.8VV T Threshold Voltage at SENSE Inpu TL7702ATL7705ATL7709ATL7712ATL7715At V s=3.6V to18V 2.454.457.410.4132.534.557.610.813.52.584.67.71113.8VV T+,V T–Hysteresis(2)at SENSE Input TL7702ATL7705ATL7709ATL7712ATL7715A V s=3.6V to18VT amb=25o C1015203545mVI I Input Current at RESIN Input V i=2.4V to V SV i=0.4V20-100µAI I Input Current at SENSE Input TL7702A V ref<V i<V s-1.5V0.52µAI OH High-level Output Current at RESET V O=18V50µAI OL Low-level Output Current at RESET V O=0V-50µAI S Supply Current All Inputs and out.open1.8 3.3mANotes: 1.All characteristics are measur ed with C=0.1µF from Pin1to GND,and with C=0.1µF from Pin3to GND.2.Hysteresis is the difference between the positive going input threshold voltage.V T+,and the negative going input thresholdvoltage,V T-.SWITCHING CHARACTERISTICSSymbol Parameter Test Conditions Min.Typ.Max.Unit t pi Pulse Width at SENSE Input V ih=V ityp+0.04x V iV iL=V ityp–0.04x V i0.9µst pi Pulse Width at RESIN Input0.4µs t po Pulse Width at Output C T=0.1µF0.65 1.3 2.6ms t pdHL Propagation Delay Time from RESINto RESETC L=100pF,V s=5V,R L=4.7kΩ1µst r/f Rise/Falltime at RESET and RESET C L=10pF,V s=5V,R L=4.7kΩ1µsTL7700A Series3/7TL7700A SeriesFigure1:Multiple Power Supply System Reset Generation Figure2:Reset Controller forµP4/7TL7700A Series SO8PACKAGE MECHANICAL DATAmm inch DIM.MIN.TYP.MAX.MIN.TYP.MAX.A 1.750.069a10.10.250.0040.010a2 1.650.065a30.650.850.0260.033b0.350.480.0140.019b10.190.250.0070.010C0.250.50.0100.020c145°(typ.)D 4.8 5.00.1890.197E 5.8 6.20.2280.244e 1.270.050e3 3.810.150F 3.8 4.00.150.157L0.4 1.270.0160.050M0.60.024S8°(max.)5/7TL7700A SeriesMINIDIP PACKAGE MECHANICAL DATAmm inch DIM.MIN.TYP.MAX.MIN.TYP.MAX.A 3.320.131a10.510.020B 1.15 1.650.0450.065b0.3560.550.0140.022 b10.2040.3040.0080.012 D10.920.430 E7.959.750.3130.384e 2.540.100e37.620.300e47.620.300F 6.60.260I 5.080.200L 3.18 3.810.1250.150 Z 1.520.0606/7TL7700A Series Information furnished is believed to be accurate and reliable.However,SGS-THOMSON Microelectronics assumes no responsibility for the consequence s of use of such information nor for any infringement of patents or other rights of third parties which may result from its use.No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.Specification mentioned in this publication are subject to change without notice.This publication supersedes and replaces all information previouslysupplied.SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systemswithout express written approval of SGS-THOMSON Microelectronics.©1996SGS-THOMSON Microelectronics–Printed in Italy–All Rights ReservedSGS-THOMSON Microelectronics GROUP OF COMPANIESAustralia-Brazil-Canada-China-France-Germany-Hong Kong-Italy-Japan-Korea-Malaysia-Malta-Morocco-The Nether-lands-Singapore-Spain-Sweden-Switzerland-Taiwan-Thailand-United Kingdom-U.S.A.7/7。