MAX6313UK36D1中文资料

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MS6323中文资料

3.3V ELECTRICAL CHARACTERISTICS
(Ta=25 Symbol DC Characteristics VCAP VDC VFS IQ PSRR CS Res THD+N S/N Voltage at CAP Output DC level Full scale output voltage Quiescent current Power supply rejection ratio Channel separation Resolution Total harmonic distortion plus noise Signal-to-noise ratio VFS=0.5VDD At code 0000H CAP=1uF, f=100Hz CAP=10uF, f=100Hz 1.60 1.60 1.5 45 63 78 86 1.65 1.65 1.65 2.0 50 68 84 -66 0.05 92 1.70 1.70 1.8 2.3 16 -62 0.08 V V Vpp mA dB dB dB bits dB , VDD=3.3V, VSS=0V, f=1kHz, Cap=1uF; unless otherwise specified) Parameter Conditions Min Typ Max Unit
4

元器件交易网
MOSA
TIMING AND DATA FORMAT
REFERENCE SOURCE
1uF VREF 4 GND
WS
2 CONTROL & TIMING
RIGHT INPUT LATCH 10uF 0.1uF
DATA
3
5
VDD
Fig.1

IBM 部分电源控制IC中文引脚说明

MAX1631的引脚说明PIN1：CSH3。

3.3V SMPS（开关电源Switch Mode Power Supply )电流检测输入，以CSL3为参考限流电平为100mV。

PIN2：CSL3。

电流检测输入。

常在固定输出模式里作为反馈输入。

PIN3：FB3。

3.3V SMPS的反馈输入；将FB3调整在REF（约2.5V）时为输出可调模式。

当FB3接地时，为固定3.3V输出。

当FB3连接一个分压电阻时为输出可调节模式。

PIN4：对MAX1630、MAX1632来说，此脚为12V输出。

可往外提供12V，120mA的电压。

但要外接一个1uF电容。

对MAX1631来说，此脚为STEER。

次级反馈的逻辑控制输入。

用来选择PWM采用那路变压器和次级反馈信号。

当STEER为GND时，SECFB（secondary feedback次级反馈采用3.3V 变压器次级反馈。

当STEER为VL时，SECFB采用5V 变压器次级反馈。

PIN5：对MAX1630、MAX1632，VDD。

内置线性12V的电源。

对MAX1631，SECFB，次级线圈反馈输入。

通常从辅助输出连接一个电阻分压器。

SECFB调整在。

当接时为不采用。

2.5V VLPIN6：SYNC，振荡同步和频率选择。

连接到VL时工作在300kHZ；接地工作在200kHZ。

当有外接同步时时钟范围可在240kHZ至350Khz。

PIN7：TIME/ON5，具有双用途，用作定时电容引脚和开关控制输入。

PIN8：GND，低噪音模拟地和反馈参考点。

PIN9：REF，2.5V参考电压输出。

接1uF电容至地。

PIN10：SKIP#。

逻辑控制输入。

当为高电平时取消空闲模式。

接地为正常模式。

PIN11：RESET#，低电平有效的定时复位输出。

RESET#在地至VL之间变化。

在上电后的32,000个周32000期变高电平。

PIN12：FB5，5V SMPS反馈输入；调整到FB5=REF（约2.5V）工作输出可调整模式。

MAX6314US37D1-T中文资料

General DescriptionThe MAX6314 low-power CMOS microprocessor (µP)supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314’s RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.This device performs a single function: it asserts a reset signal whenever the V CC supply voltage falls below a preset threshold or whenever manual reset is asserted.Reset remains asserted for an internally programmed interval (reset timeout period) after V CC has risen above the reset threshold or manual reset is deasserted.The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms,and 1120ms (minimum) are also available. The device comes in a SOT143 package.F or a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered EquipmentFeatures♦Small SOT143 Package♦RESET Output Simplifies Interface to Bidirectional Reset I/Os♦Precision Factory-Set V CC Reset Thresholds:100mV Increments from 2.5V to 5V♦±1.8% Reset Threshold Accuracy at T A = +25°C ♦±2.5% Reset Threshold Accuracy Over Temp.♦Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) ♦Immune to Short V CC Transients ♦5µA Supply Current♦Pin-Compatible with MAX811MAX6314*68HC11/Bidirectional-CompatibleµP Reset Circuit________________________________________________________________Maxim Integrated Products1Pin ConfigurationTypical Operating Circuit19-1090; Rev 2; 12/05Ordering Information continued at end of data sheet.*Patents PendingFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering Information†The MAX6314 is available in a SOT143 package, -40°C to+85°C temperature range.††The first two letters in the package top mark identify the part,while the remaining two letters are the lot tracking code.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.5V to +5.5V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:The MAX6314 monitors V CC through an internal, factory-trimmed voltage divider that programs the nominal reset threshold.Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking Information ).Note 2:This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop.Note 3:Measured from RESET V OL to (0.8 x V CC ), R LOAD = ∞.V CC ........................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (RESET )......................................................20mA Rate of Rise (V CC )...........................................................100V/µsContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C).......................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________3__________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)4.7k Ω PULL-UP 2V/divMAX6314 PULL-UP 2V/divINPUT 5V/div200ns/divPULLUP CHARACTERISTICS100pF4.7k Ω+5V74HC0574HC05V CCGNDMR 100pF+5VRESETMAX63146-50-303090SUPPLY CURRENT vs. TEMPERATURE215TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-101050347060135SUPPLY CURRENT vs. SUPPLY VOLTAGE215SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )2344500-50-301090POWER-DOWN RESET DELAYvs. TEMPERATURE1040TEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )-1020303050701.040.96-50-301090NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (V CC RISING)0.970.981.021.001.03M A X 6314-05TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D -100.991.013050701.0060.994-50-301090NORMALIZED RESET THRESHOLD vs. TEMPERATURE (V CC FALLING)0.9960.9981.0041.000M A X 6314-06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D-101.0023050701000101001000MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE20RESET COMP. OVERDRIVE, V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N (µs )4060806000-50-301090RESET PULLUP TIME vs. TEMPERATURE100200500300TEMPERATURE (°C)R E S E T P U L L -U P -T I M E (n s )-10400305070Figure 1. Functional Diagram M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 4_____________________________________________________________________________________________________________________________________________________Pin DescriptionSupply Voltage and Reset Threshold Monitor InputV CC4Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (t RP ) after the reset conditions are terminated. Connect to V CC if not used.MR 3PIN Active-Low Complementary Output. In addition to the normal n-channel pulldown, RESET has a p-channel pullup transistor in parallel with a 4.7k Ωresistor to facilitate connection to µPs with bidirectional resets. See the Reset Output section.RESET2GroundGND 1FUNCTIONNAMEMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________5Detailed DescriptionThe MAX6314 has a reset output consisting of a 4.7k Ωpull-up resistor in parallel with a P-channel transistor and an N-channel pull down (Figure 1), allowing this IC to directly interface with microprocessors (µPs) that have bidirectional reset pins (see the Reset Output section).Reset OutputA µP’s reset input starts the µP in a known state. The MAX6314 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for V CC > 1V (see the Electrical Characteristics table).Once V CC exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (t RP ); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its pro-grammed reset threshold), RESET goes low. Any time V CC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when V CC returns above the reset threshold, and RESET remains low for the reset timeout period.The MAX6314’s RESET output is designed to interface with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Like an open-drain output, the MAX6314 allows the µP or other devices to pull RESET low and assert a reset condition. However, unlike a standard open-drain output, it includes the commonly specified 4.7k Ωpullup resistor with a P-channel active pullup in parallel.This configuration allows the MAX6314 to solve a prob-lem associated with µPs that have bidirectional reset pins in systems where several devices connect to RESET . These µPs can often determine if a reset was asserted by an external device (i.e., the supervisor IC)or by the µP itself (due to a watchdog fault, clock error,or other source), and then jump to a vector appropriate for the source of the reset. However, if the µP does assert reset, it does not retain the information, but must determine the cause after the reset has occurred.The following procedure describes how this is done with the Motorola 68HC11. In all cases of reset, the µP pulls RESET low for about four E-clock cycles. It then releases RESET , waits for two E-clock cycles, then checks RESET ’s state. If RESET is still low, the µP con-cludes that the source of the reset was external and,when RESET eventually reaches the high state, jumps to the normal reset vector. In this case, stored state information is erased and processing begins fromscratch. If, on the other hand, RESET is high after the two E-clock cycle delay, the processor knows that it caused the reset itself and can jump to a different vec-tor and use stored state information to determine what caused the reset.The problem occurs with faster µPs; two E-clock cycles is only 500ns at 4MHz. When there are several devices on the reset line, the input capacitance and stray capacitance can prevent RESET from reaching the logic-high state (0.8 x V CC ) in the allowed time if only a passive pullup resistor is used. In this case, all resets will be interpreted as external. The µP is guaranteed to sink only 1.6mA, so the rise time cannot be much reduced by decreasing the recommended 4.7k Ωpullup resistance.The MAX6314 solves this problem by including a pullup transistor in parallel with the recommended 4.7k Ωresis-tor (Figure 1). The pullup resistor holds the output high until RESET is forced low by the µP reset I/O, or by the MAX6314 itself. Once RESET goes below 0.5V, a com-parator sets the transition edge flip-flop, indicating that the next transition for RESET will be low to high. As soon as RESET is released, the 4.7k Ωresistor pulls RESET up toward V CC . When RESET rises above 0.5V,the active p-channel pullup turns on for the 2µs duration of the one-shot. The parallel combination of the 4.7k Ωpullup and the p-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition low to high with-in the required two E-clock period, even with several devices on the reset line (Figure 2). Once the one-shot times out, the p-channel transistor turns off. This process occurs regardless of whether the reset was caused by V CC dipping below the reset threshold, MR being asserted, or the µP or other device asserting RESET . Because the MAX6314 includes the standard 4.7k Ωpullup resistor, no external pullup resistor is required. To minimize current consumption, the internal pullup resistor is disconnected whenever the MAX6314asserts RESET .Manual Reset InputMany µP-based products require manual reset capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low,and for the reset active timeout period after MR returns high. To minimize current consumption, the internal 4.7k Ωpullup resistor on RESET is disconnected whenever RESET is asserted.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 6_______________________________________________________________________________________MR has an internal 63k Ωpullup resistor, so it can be left open if not used. Connect a normally open momen-tary switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.__________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The T ypical Operating Character-istics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negative-going pulses, starting at V RST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e., goes farther below the reset threshold),the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to V CC provides addi-tional transient immunity.Ensuring a Valid RESET OutputDown to V CC = 0VWhen V CC falls below 1V, RESET no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications, since most µP and other circuitry is inoperative with V CC below 1V. However, in applications where RESET must be valid down to V CC = 0V, adding a pull-down resistor to RESET will cause any stray leakage currents to flow to ground,holding RESET low (Figure 3). R1’s value is not critical;100k Ωis large enough not to load RESET and small enough to pull RESET to ground.Figure 2. MAX6314 Supports Additional Devices on the Reset BusFigure 3. RESET Valid to V CC = Ground CircuitMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________7Figure 4. RESET Timing Diagram†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.___________________________________________Ordering Information (continued)M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc._____________________________Ordering and Marking Information (continued)†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.Chip InformationTRANSISTOR COUNT: 519Package InformationFor the latest package outline information, go to /packages .。

MAX320-MAX322中文资料

ELECTRICAL CHARACTERISTICS
(V+ = +5V ±10%, V- = -5V ±10%, VINH = 3.5V, VINL = 2.5V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER ANALOG SWITCH Analog Signal Range
For equivalent devices specified for single-supply operation, see the MAX323/MAX324/MAX325 data sheet. For quad versions of these switches, see the MAX391/MAX392/MAX393 data sheet.
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW Narrow SO (derate 5.88mW/°C above +70°C) .............471mW
µMAX (derate 4.10mW/°C above +70°C) .....................330mW CERDIP (derate 8.00mW/°C above +70°C) ..................640mW Operating Temperature Ranges MAX32_C_ _ ........................................................0°C to +70°C MAX32_E_ _......................................................-40°C to +85°C MAX32_MJA ...................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C

MAX4130EUK+T,MAX4130EUK+T,MAX4132ESA+,MAX4132EUA+,MAX4131ESA,MAX4131EBT+T, 规格书,Datasheet 资料

MAX4130–MAX4134________________________________________________________________Maxim Integrated Products1For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .General DescriptionThe MAX4130–MAX4134 family of operational amplifiers combines 10MHz gain-bandwidth product and excellent DC accuracy with Rail-to-Rail ®operation at the inputs and outputs. These devices require only 900µA per amplifier, and operate from either a single supply (+2.7V to +6.5V) or dual supplies (±1.35V to ±3.25V) with a common-mode voltage range that extends 250mV beyond V EE and V CC . They are capable of driving 250Ωloads and are unity-gain stable. In addition, the MAX4131/ MAX4133 feature a shutdown mode in which the outputs are placed in a high-impedance state and the supply current is reduced to only 25µA per amplifier.With their rail-to-rail input common-mode range and output swing, the MAX4130–MAX4134 are ideal for low-voltage, single-supply operation. Although the minimum operating voltage is specified at 2.7V, the devices typically operate down to 1.8V. In addition, low offset voltage and high speed make them the ideal signal-conditioning stages for precision, low-voltage data-acquisition systems. The MAX4130 is offered in the space-saving 5-pin SOT23 package. The MAX4131 is offered in the ultra-small 6-bump, 1mm x 1.5mm chip-scale package (UCSP™).________________________ApplicationsBattery-Powered Instruments Portable Equipment Data-Acquisition Systems Signal ConditioningLow-Power, Low-Voltage ApplicationsFeatureso 6-Bump UCSP (MAX4131)o +2.7V to +6.5V Single-Supply Operationo Rail-to-Rail Input Common-Mode Voltage Rangeo Rail-to-Rail Output Voltage Swing o 10MHz Gain-Bandwidth Product o 900µA Quiescent Current per Amplifier o 25µA Shutdown Function (MAX4131/MAX4133)o 200µV Offset Voltageo No Phase Reversal for Overdriven Inputs o Drive 250ΩLoadso Stable with 160pF Capacitive Loads o Unity-Gain StableSingle/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps19-1089; Rev 3; 3/03*Dice are specified at T A = +25°C. DC parameters only.Ordering Information continued at end of data sheet.Pin Configurations appear at end of data sheet.Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.UCSP is a trademark of Maxim Integrated Products, Inc.M A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply Rail-to-Rail I/O Op Amps 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = +25°C , unless otherwise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V CC - V EE )...................................................7.5V IN+, IN-, SHDN Voltage...................(V CC + 0.3V) to (V EE - 0.3V)Output Short-Circuit Duration (Note 1).......................Continuous(short to either supply)Continuous Power Dissipation (T A = +70°C)5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Bump UCSP (derate 2.9mW/°C above +70°C).........308mW 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW8-Pin µMAX (derate 4.10mW/°C above +70°C)...........330mW 14-Pin SO (derate 8.00mW/°C above +70°C)..............640mW Operating Temperature RangeMAX413_E__...................................................-40°C to +85°C Maximum Junction Temperature.....................................+150°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature .........................................+235°CNote 1:Provided that the maximum package power-dissipation rating is not exceeded.MAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply Rail-to-Rail I/O Op AmpsDC ELECTRICAL CHARACTERISTICS (continued)(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = +25°C , unless otherwise noted.)DC ELECTRICAL CHARACTERISTICS(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = -40°C to +85°C , unlessM A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply Rail-to-Rail I/O Op Amps 4_______________________________________________________________________________________DC ELECTRICAL CHARACTERISTICS(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = -40°C to +85°C , unlessMAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply Rail-to-Rail I/O Op Amps_______________________________________________________________________________________5DC ELECTRICAL CHARACTERISTICS (continued)(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = -40°C to +85°C , unless otherwise noted.) (Note 2)AC ELECTRICAL CHARACTERISTICSM A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 6_______________________________________________________________________________________60-401001k 10k 1M 10M100k 100M GAIN AND PHASE vs. FREQUENCY-20FREQUENCY (Hz)G A I N (d B )02040P H A S E (D E G R E E S )180144720-72-144-180-108-363610860-401001k 10k 1M 10M100k 100MGAIN AND PHASEvs. FREQUENCY (WITH C)-20FREQUENCY (Hz)G A I N (d B )2040P H A S E (D E G R E E S )180144720-72-144-180-108-36361080-100101001k100k1M10M10k 100MPOWER-SUPPLY REJECTIONvs. FREQUENCY-80FREQUENCY (Hz)P S R (d B )-60-40-2001051520253530454050-40-25-105203550658095SHUTDOWN SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )1000.100.011001k100k1M10M10k100MOUTPUT IMPEDANCE vs. FREQUENCYFREQUENCY (Hz)O U T P U T I M P E D A N C E (Ω)1101150800850900950105010001100-40-25-105203550658095SUPPLY CURRENT PER AMPLIFIERvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-10-505101520-40-25-105203550658095OUTPUT LEAKAGE CURRENTvs. TEMPERATURETEMPERATURE (°C)L E A K A G E C U R R E N T (µA )Typical Operating Characteristics(V CC = +5V, V EE = 0V, VCM = V CC / 2, T A = +25°C, unless otherwise noted.)-600123456INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGECOMMON-MODE VOLTAGE (V)I N P U T B I A S C U R R E N T (n A )-50-40-30-20-10010203040-60-40-40-25-105203550658095INPUT BIAS CURRENTvs. TEMPERATURETEMPERATURE (°C)I N P U T B I A S C U R R E N T (n A )-200204060MAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps_______________________________________________________________________________________712070750600110115OUTPUT VOLTAGE: EITHER SUPPLY (mV)G A I N (d B )30095859080100200500105100400LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE130-40-25-105203550658095LARGE-SIGNAL GAIN vs. TEMPERATURE90120TEMPERATURE (°C)G A I N (d B )11010085951251151051.21.31.51.41.61.71.81.9-40-25-105203550658095MINIMUM OPERATING VOLTAGEvs. TEMPERATUREM A X 4130/34-21TEMPERATURE (°C)M I N I M U M O P E R A T I N G V O L T A G E (V )Typical Operating Characteristics (continued)(V CC = +5V, V EE = 0V, V CM = V CC / 2, T A = +25°C, unless otherwise noted.)12080859095100105110115-40-25-105203550658095COMMON-MODE REJECTIONvs. TEMPERATURETEMPERATURE (°C)C O M M O N -M ODE R E J E C T I O N (d B )130700600120OUTPUT VOLTAGE: EITHER SUPPLY (mV)G A I N (dB )3001009080100200500110400LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE12060600110OUTPUT VOLTAGE: EITHER SUPPLY (mV)G A I N (d B )300908070100200500100400LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE12080-40-25-105203550658095LARGE-SIGNAL GAIN vs. TEMPERATURE90TEMPERATURE (°C)G A I N (d B )105859511511010012070750600110115OUTPUT VOLTAGE: EITHER SUPPLY (mV)G A I N (d B )30095859080100200500105100400LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE-3.00-2.25-0.75-1.5001.500.752.253.00-40-25-105203550658095INPUT OFFSET VOLTAGE vs. TEMPERATURETEMPERATURE (°C)V O L T A G E (m V )M A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 8_______________________________________________________________________________________1408010k 1k 100k 10M 1M CHANNEL SEPARATION vs. FREQUENCYFREQUENCY (Hz)C H A N N E L S E P A R A T I O N (d B )1009013011012010100k10kFREQUENCY (Hz)1001k 0.03000.0050.0100.0150.0200.025 TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCYT H D A N D N O I S E (%)0.10.0014.04.44.25.04.84.6TOTAL HARMONIC DISTORTION AND NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDEPEAK-TO-PEAK SIGNAL AMPLITUDE (V)T H D + N O I S E (%)0.01INTIME (200ns/div)V O L T A G E (50m V /d i v )OUTMAX4131SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)IN TIME (200ns/div)V O L T A G E (50m V /d i v )OUT MAX4131SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)A V = -1IN TIME (2µs/div)V O L T A G E (2V/d i v )OUT MAX4131LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)A V = +1INTIME (2µs/div)V O L T A G E (2V /d i v )OUTMAX4131LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)Typical Operating Characteristics (continued)(V CC = +5V, V EE = 0V, V CM = V CC / 2, T A = +25°C, unless otherwise noted.)1600-40-25-105203550658095MINIMUM OUTPUT VOLTAGEvs. TEMPERATURE20140120TEMPERATURE (°C)V O U T - V E E (m V )100806040050100150200250300-40-25-105203550658095MAXIMUM OUTPUT VOLTAGEvs. TEMPERATURETEMPERATURE (°C)V C C - V O U T (m V )MAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps_______________________________________________________________________________________9Figure 1a. Reducing Offset Error Due to Bias Current (Noninverting)Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)M A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 10______________________________________________________________________________________Applications InformationRail-to-Rail Input StageDevices in the MAX4130–MAX4134 family of high-speed amplifiers have rail-to-rail input and output stages designed for low-voltage, single-supply opera-tion. The input stage consists of separate NPN and PNP differential stages that combine to provide an input common-mode range that extends 0.2V beyond the supply rails. The PNP stage is active for input volt-ages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The input offset voltage is typically below 200µV. The switchover transition region, which occurs near V CC / 2, has been extended to minimize the slight degradation in com-mon-mode rejection ratio caused by the mismatch of the input pairs. Their low offset voltage, high band-width, and rail-to-rail common-mode range make these op amps excellent choices for precision, low-voltage data-acquisition systems.Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region.Reduce the offset error caused by input bias currents flowing through external source impedances by match-ing the effective impedance seen by each input (Figures 1a, 1b). High source impedances, together with input capacitance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF)capacitor across the feedback resistor improves response.The MAX4130–MAX4134s ’ inputs are protected from large differential input voltages by 1k Ωseries resistors and back-to-back triple diodes across the inputs (Figure 2). For differential input voltages less than 1.8V,input resistance is typically 500k Ω. For differential input voltages greater than 1.8V, input resistance is approxi-mately 2k Ω. The input bias current is given by the fol-lowing equation:Figure 2. Input Protection CircuitMAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps______________________________________________________________________________________11Rail-to-Rail Output StageThe minimum output voltage is within millivolts of ground for single-supply operation where the load is referenced to ground (V EE ). Figure 3 shows the input voltage range and output voltage swing of a MAX4131connected as a voltage follower. With a +3V supply and the load tied to ground, the output swings from 0.00V to 2.90V. The maximum output voltage swing depends on the load, but will be within 150mV of a +3V supply, even with the maximum load (500Ωto ground).Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quies-cent current. The MAX4130–MAX4134 have a high tol-erance for capacitive loads. They are stable with capacitive loads up to 160pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5 and 6show the response with capacitive loads and the results of adding an isolation resistor in series with the output (Figure 7). The resistor improves the circuit ’s phase margin by isolating the load capacitor from the op amp ’s output.INTIME (1µs/div)V O L T A G E (1V /d i v )OUTV CC = 3V, R L = 10k Ω to V EEFigure 3. Rail-to-Rail Input/Output Voltage RangeFigure 4. Capacitive-Load StabilityINTIME (200ns/div)V O L T A G E (50m V /d i v )OUTV CC = 5V R L = 10k Ω C L = 130pFFigure 5. MAX4131 Small-Signal Transient Response with Capacitive Load Figure 6. MAX4131 Transient Response to Capacitive Load with Isolation ResistorINTIME (500ns/div)V O L T A G E (50m V /d i v )OUTV CC = 5V C L = 1000pF R S = 39ΩM A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 12______________________________________________________________________________________Power-Up and Shutdown ModeThe MAX4130–MAX4134 amplifiers typically settle with-in 1µs after power-up. Figures 9 and 10 show the out-put voltage and supply current on power-up, using the test circuit of Figure 8.The MAX4131 and MAX4133 have a shutdown option.When the shutdown pin (SHDN ) is pulled low, the sup-ply current drops below 25µA per amplifier and theamplifiers are disabled with the outputs in a high-impedance state. Pulling SHDN high or leaving it float-ing enables the amplifier. In the dual-amplifier MAX4133, the shutdown functions operate indepen-dently. Figures 11 and 12 show the output voltage and supply current responses of the MAX4131 to a shut-down pulse, using the test circuit of Figure 8.Figure 7. Capacitive-Load Driving CircuitFigure 8. Power-Up/Shutdown Test CircuitV CC TIME (5µs/div)V O L T A G E (1V /d i v )OUTFigure 9. Power-Up Output Voltage V CC (1V/div)TIME (5µs/div)I EE(500µA/div)Figure 10. Power-Up Supply CurrentMAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps______________________________________________________________________________________13Power Supplies and LayoutThe MAX4130–MAX4134 operate from a single +2.7V to +6.5V power supply, or from dual supplies of ±1.35V to ±3.25V. For single-supply operation, bypass the power supply with a 0.1µF ceramic capacitor in parallel with at least 1µF. For dual supplies, bypass each sup-ply to ground.Good layout improves performance by decreasing the amount of stray capacitance at the op amp ’s inputs and outputs. Decrease stray capacitance by placing external components close to the op amp ’s pins, mini-mizing trace lengths and resistor leads.UCSP Applications InformationFor the latest application details on UCSP construction,dimensions, tape carrier information, PC board tech-niques, bump-pad layout, and the recommended reflow temperature profile, as well as the latest informa-tion on reliability testing results, go to Maxim ’s website at /ucsp and search for the Application Note: UCSP –A Wafer-Level Chip-Scale Package .TIME (1µs/div)OUTFigure 11. Shutdown Output Voltage TIME (1µs/div)Figure 12. Shutdown Enable/Disable Supply CurrentM A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 14________________________________________________________________________________________________________________________________________________Pin ConfigurationsMAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps______________________________________________________________________________________15Chip InformationOrdering Information (continued)MAX4130 TRANSISTOR COUNT: 170MAX4131 TRANSISTOR COUNT: 170MAX4132 TRANSISTOR COUNT: 340MAX4134 TRANSISTOR COUNT: 680*Dice are specified at T A = +25°C, DC parameters only.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)M A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps 16______________________________________________________________________________________Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)MAX4130–MAX4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps______________________________________________________________________________________17Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are M A X 4130–M A X 4134Single/Dual/Quad, Wide-Bandwidth, Low-Power,Single-Supply, Rail-to-Rail I/O Op Amps implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.18__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2003 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。

MAX6663AEE资料

General DescriptionThe MAX6653/MAX6663/MAX6664 are ACPI-compliant local and remote-junction temperature sensors and fan controllers. These devices measure their own die tem-perature, as well as the temperature of a remote-PN junction and control the speed of a DC cooling fan based on the measured temperature. Remote tempera-ture measurement accuracy is ±1°C from +60°C to +100°C. Temperature measurement resolution is 0.125°C for both local and remote temperatures.Internal watchdog set points are provided for both local and remote temperatures. There are two comparison set points for local temperatures and two for remote temperatures. When a set point is crossed, the MAX6653/MAX6663/MAX6664 assert either the INT or THERM outputs. These outputs can be used as inter-rupts, clock throttle signals, or overtemperature shut-down signals. Two pins on the MAX6653 control the power-up values of the comparison set points, provid-ing fail-safe protection even when the system is unable to program the trip temperatures. The MAX6653 has two additional shutdown outputs, SDR and SDL , that are triggered when the remote or local temperatures exceed the programmed shutdown set points. The INT output for the MAX6653/MAX6663 and THERM outputs for the MAX6653/MAX6663/MAX6664 can also function as inputs if either is pulled low to force the fan to full speed, unless this function is masked by the user.The MAX6653/MAX6663/MAX6664 are available in 16-pin QSOP packages and operate over the -40°C to +125°C temperature range.ApplicationsPersonal Computers Servers Workstations Telecom Equipment Networking Equipment Test Equipment Industrial ControlsFeatureso Remote-Junction Temperature Sensor Within ±1°C Accuracy (+60°C to +100°C)o ACPI-Compatible Programmable Temperature Alarms o 0.125°C Resolution Local and Remote-Junction Temperature Measurement o Programmable Temperature Offset for System Calibration o SMBus 2-Wire Serial Interface with Timeout o Automatic or Manual Fan-Speed Control o PWM Fan Control Outputo Fan-Speed Monitoring and Watchdog o Fan Fault and Failure Indicators o Compatible with 2-Wire or 3-Wire Fans (Tachometer Output)o +3V to +5.5V Supply Rangeo Additional Shutdown Set Point (MAX6653)o Controlled PWM Rise/Fall TimesMAX6653/MAX6663/MAX6664Temperature Monitors andPWM Fan Controllers________________________________________________________________Maxim Integrated Products1Pin Configurations19-2865; Rev 1; 12/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering InformationTypical Operating Circuits appear at end of data sheet.Functional Diagram appears at end of data sheet.M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.All Voltages Are Referenced to GNDTACH/AIN..............................................................-0.3V to +5.5V V CC ...........................................................................-0.3V to +6V DXP, ADD, CRIT0, CRIT1........................-0.3V to + (V CC + 0.3V)DXN.......................................................................-0.3V to +0.8V SMBDATA, SMBCLK, INT , THERM ,FAN_FAULT , SDL , SDR ............................................-0.3V to +6V SMBDATA, INT , THERM , FAN_FAULT ,PWM_OUT Current..............................................-1mA to +50mADXN Current .......................................................................±1mA ESD Protection (all pins, Human Body Model)..................2000V Continuous Power Dissipation (T A = +70°C)16-Pin QSOP (derate 8.3 mW/°C above +70°C)..........667mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +165°C Lead Temperature (soldering, 10s).................................+300°CELECTRICAL CHARACTERISTICSMAX6653/MAX6663/MAX6664Temperature Monitors andPWM Fan Controllers_______________________________________________________________________________________3Note 2:Not production tested, guaranteed by design.ELECTRICAL CHARACTERISTICS (continued)M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllers 4_______________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)REMOTE TEMPERATURE ERROR vs. REMOTE-DIODE TEMPERATUREREMOTE-DIODE TEMPERATURE (°C)T E M P E R A T U R E E R R O R (°C )110956580-105203550-25-40125-1.5-1.0-0.500.51.01.52.0-2.0LOCAL TEMPERATURE ERROR vs. DIE TEMPERATUREM A X 6653 t o c 04DIE TEMPERATURE (°C)L O C A L T E M P E R A T U R E E R R O R (°C )110956580-105203550-25-40125-1.5-1.0-0.500.51.01.52.0-2.01000.0010.010.1110100REMOTE TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY2POWER-SUPPLY NOISE FREQUENCY (MHz)R E M O T E T E M P E R A T U R E E R R O R (°C )468135797-20.0010.010.1110100LOCAL TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY-10POWER-SUPPLY NOISE FREQUENCY (MHz)R E M O T E T E M P E R A T U R E E R R O R (°C )215643TEMPERATURE ERRORvs. COMMON-MODE NOISE FREQUENCYCOMMON-MODE NOISE FREQUENCY (MHz)0.00010.11100.0010.01100T E M P E R A T U R E E R R O R (°C )12-22461088765432100.011100.1100TEMPERATURE ERRORvs. DIFFERENTIAL-MODE NOISE FREQUENCYDIFFERENTIAL-MODE NOISE FREQUENCY (MHz)T E M P E R A T U R E E R R O R (°C )TEMPERATURE ERROR vs. DXP-DXN CAPACITANCEDXP-DXN CAPACITANCE (nF)T E M P E R A T U R E E R R O R (°C )1-5-4-3-2-101101002.03.02.54.03.54.55.03.05.5STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S T A N D B Y S U P P L Y C U R R E N T (µA )4.03.54.55.0AVERAGE OPERATING SUPPLY CURRENTvs. CONVERSION RATECONVERSION RATE (Hz)S U P P L Y C U R R E N T (µA )32150100150200250300350400450500004MAX6653/MAX6663/MAX6664Temperature Monitors and PWM Fan Controllers Array_______________________________________________________________________________________5M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllers 6Detailed DescriptionThe MAX6653/MAX6663/MAX6664 are local/remote temperature monitors and fan controllers for micro-processor-based systems. These devices communi-cate with the system through a serial SMBus interface.The serial bus controller features a hard-wired address pin for device selection, an input line for a serial clock,and a serial line for reading and writing addresses and data (see Functional Diagram ).The MAX6653/MAX6663/MAX6664 fan control section can operate in three modes. In the automatic fan-control mode, the fan ’s power-supply voltage is automatically adjusted based on temperature. The control algorithm parameters are programmable to allow optimization to the characteristics of the fan and the system. RPM select mode forces the fan speed to a programmed tachome-ter value. PWM duty cycle select mode allows user selection of the PWM duty cycle. PWM rise and fall times are limited to maximize fan reliability.To ensure overall system reliability, the MAX6653/MAX6663/MAX6664 feature an SMBus timeout so that the MAX6653/MAX6663/MAX6664 can never “lock ” the SMBus. F urthermore, the availability of hard-wired default values for critical temperature set points ensures the MAX6653 controls critical temperature events properly even if the SMBus is “locked ” by some other device on the bus.SMBus Digital InterfaceF rom a software perspective, the MAX6653/MAX6663/MAX6664 appear as a set of byte-wide registers. These devices use a standard SMBus 2-wire/I 2C-compatible serial interface to access the internal registers. The MAX6653/MAX6663/MAX6664 slave address can be set to three different values by the input pin ADD(Table 2) and, therefore, a maximum of three MAX6653/MAX6663/MAX6664 devices can share the same bus.The MAX6653/MAX6663/MAX6664 employ four stan-dard SMBus protocols: Write Byte, Read Byte, Send Byte, and Receive Byte (Figures 1, 2, and 3). The short-er Receive Byte protocol allows quicker transfers, pro-vided that the correct data register was previously selected by a Read Byte instruction. Use caution with the shorter protocols in multimaster systems, since a second master could overwrite the command byte with-out informing the first master.Alert Response AddressThe MAX6653/MAX6663/MAX6664 respond to the SMBus alert response address, an event which typical-ly occurs after an SMBus host master detects an INT interrupt signal going active (referred to as ALERT in SMBus nomenclature). When the host master puts the alert response address (0001 1001) on the bus, all devices with an active INT output respond by putting their own address onto the bus. The alert response can activate several different slave devices simultaneously,similar to the I 2C general call. If more than one slave attempts to respond, bus arbitration rules apply, and the device with the lowest address code wins. The master then services the devices from the lowest address up.MAX6653/MAX6663/MAX6664Temperature Monitors and PWM Fan ControllersFigure 1. SMBus ProtocolsFigure 2. SMBus Write Timing Diagram_______________________________________________________________________________________7The MAX6663 resets its INT output and some of the status bits in the status register after responding to an alert response address; however, if the error condition that caused the interrupt is still present, INT is reassert-ed on the next monitoring cycle. INT is maskable to allow full control of ALERT conditions.Temperature MeasurementThe MAX6653/MAX6663/MAX6664 contain on-chip tem-perature sensors to sense their own die (local) tempera-tures. These devices can also measure remote temperatures such as the die temperature of CPUs or other ICs having on-chip temperature-sensing diodes, or discrete diode-connected transistors as shown in the Typical O perating Circuits . F or best accuracy, the dis-crete diode-connected transistor should be a small-signal device with its collector and base connected together.The on-chip ADC converts the sensed temperature and outputs the temperature data in the format shown in Tables 3 and 4. The temperature measurement resolution is 0.125°C for both local and remote temperatures. The temperature accuracy is within ±1°C for remote tempera-ture measurements from +60°C to +100°C.The Local Temperature Offset (0Dh) and Remote Temperature Offset (0Eh) registers allow the measured temperature to be increased or decreased by a fixed value to compensate for errors due to variations in diode resistance and ideality factor (see the Remote Diode Considerations section). The reported temperature is the measured temperature plus the correction value. Both the measured temperature and the reported value are limited by the sensor ’s temperature range. F or example, if a remote thermal diode is being measured and its tempera-ture is 135°C, the measured temperature is the maximumvalue of 127.875°C. If the remote offset value is set to -10°C, the reported value is 117.875°C, not 125°C.The temperature conversion rate is programmable using bits [4:2] of the fan filter register (23h) as shown in Table 5.The DXN input is biased at 0.65V above ground by an internal diode to set up the analog-to-digital inputs for a differential measurement. The worst-case DXP-DXN dif-ferential input voltage range is from 0.25V to 0.95V.Excess resistance in series with the remote diode caus-es about 0.5°C error per ohm. Likewise, a 200µV offset voltage forced on DXP-DXN causes about 1°C error.High-frequency EMI is best filtered at DXP and DXN with an external 2200pF capacitor. This value can be increased to about 3300pF, including cable capacitance.Capacitance higher than 3300pF introduces errors due to the rise time of the switched current source.M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllers 8Temperature Comparisonand Interrupt System At the end of each conversion cycle, the converted temperature data are compared to various set-point thresholds to control the INT, THERM, SDL, and SDR outputs. All temperature threshold limits are stored in the threshold limit registers (Table 6) and can be changed through the SMBus digital interface.THERM is an active-low thermal-overload output indicat-ing that the THERM overtemperature set point is exceed-ed. With the THERM threshold set to an appropriate value, the THERM output can be used to control clock throttling. When this pin is pulled low by an external signal, a status bit (bit 7, status register 2) is set, and the fan speed is unconditionally forced to full-on speed. The only way to reset the status bit is to read status register 2. Connect a 10kΩpullup resistor between THERM and V CC.MAX6653/MAX6663/MAX6664Temperature Monitors and PWM Fan Controllers _______________________________________________________________________________________9M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan ControllersINT is an open-drain digital output that reports the sta-tus of temperature interrupt limits and fan out-of-limit conditions. Set bit 1 of configuration register 1 (00h) to 1 to enable INT output or reset this bit to zero to disable the INT output function. Status register 1 contains sta-tus information for the conditions that cause INT to assert. Reading status register 1 resets INT , but INT is reasserted if the fault condition still exists. Connect a 10k Ωpullup resistor between INT and V CC .SDL and SDR are open-drain digital outputs on the MAX6653 that can be used to shut the system down based on the local (die) temperature of the MAX6653 or the temperature of the remote sensor, respectively. The trip thresholds for SDL and SDR are normally set above the THERM and INT limits. Their power-up values are set by the CRIT1 and CRIT0 pins, as shown in Table 1.Fan-Speed ControlThe MAX6653/MAX6663/MAX6664 fan-control section can operate in one of three modes depending on the set-ting of bit 7 to bit 5 of configuration register 1 (00h).Regardless of the mode of operation, the PWM output fre-quency is programmable, and the fan speed is measured with the result stored in the fan-speed register (08h).PWM Output FrequencyThe PWM output frequency is programmed by bit 5, bit 4, and bit 3 of the fan characteristics register (20h),regardless of the mode of operation. See Table 7.Fan-Control ModeThe mode of fan-speed control operation is set by bit 7,bit 6, and bit 5 in configuration register 1 (00h), as shown in Table 8.PWM Duty-Cycle Fan-Control ModeBits [3:0] of the fan-speed configuration register set the PWM duty cycle. See Table 9 for more details.RPM Select Fan-Control ModeIn RPM select mode, the MAX6653/MAX6663/MAX6664adjust their PWM output duty cycle to match a selected fan speed measured by a tachometer count value. Before selecting this mode by setting bits [7:5] of configuration register 1 (00h) to 0x1, the desired tachometer count value should be written to the fan tachometer high-limit register (10h). In this mode, the MAX6653/MAX6663/MAX6664 are not able to detect underspeed fan faults because the fan tachometer high-limit register (10h) func-tions as the target tachometer count.The MAX6653/MAX6663/MAX6664 detect fan stall faults by comparing the fan-speed reading to the full-scale constant of 254 (F Eh). Therefore, the MAX6653/MAX6663/MAX6664 signal a fan fault when the fan-speed reading is 255 (FFh). Note that the RPM mode cannot be used for speeds below 10% of the fan ’s maximum speed. It is important to verify that a fan works properly at lower RPM values if a low-RPM oper-ation in this mode is desired.MAX6653/MAX6663/MAX6664Temperature Monitors andPWM Fan Controllers11Automatic Fan-Control ModeAutomatic fan-speed control is selected by setting bits [7:5] of configuration register 1 (00h) to 100 (to control speed based on the remote temperature) or 101 (to control speed based on both remote and local temper-ature). Program a threshold, or starting temperature TMIN, and the desired temperature range, T RANGE , into the local temp T MIN /T RANGE register (24h) for local temperature and into the remote temp T MIN /T RANGE register (25h) for remote temperature (Tables 10 and 11). If the fan control responds to both local and remote temperatures, the higher PWM duty cycle has priority.When the temperature exceeds T MIN , the fan is enabled at a minimum duty cycle programmed in bits [3:0] of the fan-speed configuration register (22h). The duty cycle increases in proportion to the temperature difference and reaches 100% at a temperature equal to (T MIN + T RANGE ). A hysteresis of 5°C is built into the T MIN set point to prevent the fan from starting and stop-ping when the temperature is at the set point.Spin-UpTo ensure proper fan startup, the MAX6653/MAX6663/MAX6664 can be set to drive the fan to 100% duty cycle for a short period on startup, and then revert to the correct duty cycle. The spin-up time is programmed by bits [2:0] in the fan characteristics register (20h).The spin-up feature can be disabled by setting bit 7 of the fan-filter register (23h) to 1; POR value is zero.Table 12 shows programming of the spin-up time.Fan-Filter ModeWhen the MAX6653/MAX6663/MAX6664 are used for automatic fan-speed control, the fan-filter mode helps minimize the audible effects of varying fan speeds. The fan-filter mode limits the rate at which fan speed can change. Each time a new temperature measurement is made, the fan-filter mode allows the PWM duty cycle to increment by a selectable amount. The duty cycle can change by 1/240, 2/240, 4/240, or 8/240 (0.416%,0.833%, 1.667%, or 3.333%) of the PWM period after each temperature-monitoring cycle. This prevents sud-den changes in fan speed, even when temperature changes suddenly.The filter mode is set by bit 0 of the fan-filter register (23h). To enable the fan-filter mode, write a 1 to this bit.Bits [6:5] of the same register control the size of the PWM steps.Note that the rate of change depends on both the value selected by the fan-filter bits and on the temperatureM A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllersmeasurement rate, which is controlled by bits [4:2] of the fan-filter register (23h). Table 5 shows the effect of the temperature measurement rate control bits. As an example, assume that the temperature measurement rate is 2Hz, or 0.5s per monitoring cycle, and the fan-fil-ter rate is 0.416% per monitoring cycle. For the fan drive to change from 50% to 100% requires 50% / 0.416% =120 temperature monitoring cycles. Thus, for a tempera-ture-monitoring cycle of 0.5s, the time required for the drive to change from 50% to 100% is 60s.Fan-Speed MeasurementThe fan speed is measured by using the relatively slow tachometer signal from the fan to gate an 11.25kHzclock frequency into a fan-speed counter. The mea-surement is initialized on the starting edge of a PWM output if fan-speed measurement is enabled by setting bit 2 of configuration register 2 (01h) to 1. Counting begins on the leading edge of the second tachometer pulse and lasts for two tachometer periods or until the counter overranges (255). The measurement repeats unless monitoring is disabled by resetting bit 2 in the configuration register 2 (01h). The measured result is stored in the fan-speed reading register (08h).The fan-speed count is given by:where RPM = fan speed in RPM.N determines the speed range and is programmed by bits [7:6] in the fan characteristics register (20h) as shown in Table 14. When the speed falls below the value in the speed range column, a fan failure is detected.The TACH/AIN input can be either a digital signal (from the fan ’s tachometer output) or an analog signal,depending on the setting of bit 2 of the configuration register 1 (00h). The default setting is zero, which sets up TACH/AIN as a digital input. F or the analog input (Figure 4), the detected voltage threshold is typically at 250mV, which is appropriate for sensing the voltage of a sense resistor connected to the ground lead of a 2-wire fan. The AIN input only responds to pulse widths greater than 10µs.F igure 5 shows a schematic using a current-sensing resistor and a coupling capacitor to derive the tachometer information from the power-supply current of a 2-wire fan. This circuit allows the speed of a 2-wire fan to be measured even though the fan has no tachometer signal output. The sensing resistor, R SENSE, converts the fan commutation pulses into a voltage and this voltage is AC-coupled into the TACH/AIN input through coupling capacitor C1. The value of R SENSE is on the order of 1Ωto 5Ω, depending on the fan, and the value of the coupling capacitor C1 is 0.01µF. When using this method, set bit 2 of configu-ration register 1 to 1.Fan-Fault Detection The FAN_FAULT output is used to indicate fan slow down or failure. POR disables the FAN_FAULT output on the MAX6653/MAX6663. POR enables FAN_FAULT output on the MAX6664. If FAN_FAULT is not enabled, writing a logic 1 to bit 4 of configuration register 1 (00h) enables the FAN_FAULT output pin. Either under-speed or stalled fans are detected as fan faults. FAN_FAULT is asserted low only when five consecutive interrupts are generated by the MAX6653/MAX6663/ MAX6664s’INT due to fan faults. The MAX6653/ MAX6664 apply 100% duty cycle for the duration of the spin-up time once an INT is asserted. The MAX6663 goes to 100% duty cycle for the duration of the spin-up time once INT is asserted and status register 1 is read. Fan-fault detection works by comparing the value of the fan tachometer high-limit register (10h) with the value of the fan-speed reading register (08h), which contains the value of the most recent fan-speed measurement. Note that the value of the fan-speed reading register (08h) must exceed the value of the fan tachometer high limit (10h) by 1 in order to qualify as a fault. The fault gener-ates an interrupt signal by asserting the INT output, but does not cause the FAN_FAULT output to assert until five consecutive failures have been detected. The fan runs at 100% duty cycle when five consecutive failures have been detected, whether FAN_FAULT is enabled or not. As an example of the function of the fan-fault detection, assume a fan is stalled or under speed. The MAX6663 ini-tially indicates the failure by generating an interrupt on the INT pin. The fan fault bit (bit 1) of interrupt status register 1 (02h) is also set to 1. Once the processor has acknowl-edged the INT by reading status register 1, the INT is cleared. PWM_OUT is then brought high for a 2s (fan spin-up default, Table 12) spin-up period to restart the fan. Subsequent fan failures cause INT to be reasserted and PWM_OUT to be brought high (following a status register 1 read) for a spin-up period each time to restart the fan. Once the fifth tachometer failure occurs, the FAN_FAULT is asserted to indicate a critical fan failure.A MAX6653/MAX6664 example is somewhat simpler. Again assume the fan is stalled or under speed. The MAX6653/MAX6664 initially indicate the failure by gener-ating an interrupt on the INT pin. The fan fault bit of the interrupt status register is set to 1. PWM_OUT goes high for the programmed spin-up time (2s default) to restart the fan. Each subsequent fan failure causes another spin-up. Once the fifth tachometer failure occurs, the FAN_FAULT output is asserted (if enabled) and the PWM output is driven to 100%.When the FAN_FAULT output is disabled (register 00h, bit 4), spin-ups are still attempted whenever the tach count is greater than the value in the fan tachometer high-limit register (10h). If fan faults and their associat-ed spin-ups are not desired, the fan tachometer high-limit register (10h) to F F. This prevents the tach count from ever exceeding the limit and faults are not detect-ed. Simply disabling the tachometer input (register 01h, bit 2) leaves the fan fault function enabled and can result in fan faults.Figure 5. Using the MAX6653/MAX6663/MAX6664 with a2-Wire FanMAX6653/MAX6663/MAX6664Temperature Monitors and PWM Fan Controllers______________________________________________________________________________________13M A X 6653/M A X 6663/M A X 6664Temperature Monitors and PWM Fan Controllers 14______________________________________________________________________________________Alarm SpeedF or the MAX6663, the alarm speed bit, bit 0 of status register 1 (02h), indicates that the PWM duty cycle is 100%, excluding the case of fan spin-up. F or the MAX6653/MAX6664, this bit indicates that the THERM output is low. Once this bit is set, the only way to clear it is by reading status register 1. However, the bit does not reassert on the next monitoring cycle if the condi-tion still exists. It does assert if the condition is discon-tinued and then returns.Power-On Default ConditionsAt power-up, the MAX6653/MAX6663/MAX6664 are monitoring temperature to protect the system against thermal damage. The PWM outputs are in known states.Note that although the "Monitoring" bit (Configuration register 1, Bit 0) is enabled, automatic fan speed control does not begin until a 1 is rewritten to Bit 0.Other default conditions as listed in the Register Summary section.After applying power to the MAX6653/MAX6663/MAX6664, set the desired operating characteristics (fan configuration, alarm thresholds, etc.). Write to Configuration register 1 last. When a 1 is first written to Bit 0 of this register, fan control will commence as determined by the register contents.PC Board LayoutF ollow these guidelines to reduce the measurement error of the temperature sensors:1)Place the MAX6653/MAX6663/MAX6664 as closeas is practical to the remote diode. In noisy environ-ments, such as a computer motherboard, this dis-tance can be 4in to 8in (typ). This length can be increased if the worst noise sources are avoided.Noise sources include CRTs, clock generators,memory buses, and ISA/PCI buses.2)Do not route the DXP-DXN lines next to the deflec-tion coils of a CRT. Also, do not route the traces across fast digital signals, which can easily intro-duce 30°C error, even with good filtering.3)Route the DXP and DXN traces in parallel and inclose proximity to each other, away from any higher voltage traces, such as 12VDC. Leakage currents from PC board contamination must be dealt with carefully since a 20M Ωleakage path from DXP to ground causes about 1°C error. If high-voltage traces are unavoidable, connect guard traces to GND on either side of the DXP-DXN traces (Figure 6).4)The 10-mil widths and spacing recommended inFigure 6are not absolutely necessary, as they offer only a minor improvement in leakage and noise over narrow traces. Use wider traces when practical.5)Add a 200Ωresistor in series with VCC for bestnoise filtering (see Typical Operating Circuits).Figure 6. Recommended DXP/DXN PC Traces。

MAX713中文资料

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

MAX6312UK48D3中文资料

ELECTRICAL CHARACTERISTICS
VCC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, VCC = (VTH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/ MAX6310/MAX6312/MAX6313; TA = -40°C to +85°C; unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
Features
o Small 5-Pin SOT23 Package o Precision Factory-Set VCC Reset Thresholds; Available in 0.1V Increments from 2.5V to 5V o Immune to Short VCC Transients o Guaranteed RESET Valid to VCC = 1V o Guaranteed Over Temperature o 8µA Supply Current o Factory-Set Reset Timeout Delay from 1ms (min) to 1120ms (min) o No External Components o Manual Reset Input o Under/Overvoltage Supply Monitoring
_______________________________________________________________Selector Table
PART MAX6305 MAX6306 MAX6307 MAX6308 MAX6309 MAX6310 MAX6311 MAX6312 MAX6313 OPEN-DRAIN RESET OUTPUT — — — — — — PUSH/PULL RESET OUTPUT — — — — — — PUSH/PULL RESET OUTPUT — — — — — — FACTORYADDITIONAL NEGATIVE/ MANUALSET RESET UNDERVOLTAGE OVERVOLTAGE RESET THRESHOLD RESET INPUTS RESET INPUT INPUT ON VCC — — — 2 1 1 2 1 1 2 1 1 — — — — — — — — — — — — 1

MAX6353LTUK中文资料

Dual/Triple-Voltage µP Supervisory Circuits MAX6351–MAX6360
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2 to GND .................................................-0.3V to +6V RST (MAX6352/MAX6355/MAX6358)...................... -0.3V to +6V RST, MR, WDI, RST1, RSTIN (MAX6351/MAX6353/ MAX6356/MAX6359) ..............................-0.3V to (VCC1 + 0.3V) RST, RST2 (MAX6351/MAX6354/ MAX6357/MAX6360) ..............................-0.3V to (VCC2 + 0.3V) Input/Output Current, All Pins .............................................20mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range .............................-65°C to +150°C

MAX630CSA+中文资料

General DescriptionMaxim’s MAX630 and MAX4193 CMOS DC-DC regula-tors are designed for simple, efficient, minimum-size DC-DC converter circuits in the 5mW to 5W range. The MAX630 and MAX4193 provide all control and power handling functions in a compact 8-pin package: a 1.31V bandgap reference, an oscillator, a voltage com-parator, and a 375mA N-channel output MOSF ET. A comparator is also provided for low-battery detection.Operating current is only 70µA and is nearly indepen-dent of output switch current or duty cycle. A logic-level input shuts down the regulator to less than 1µA quies-cent current. Low-current operation ensures high effi-ciency even in low-power battery-operated systems.The MAX630 and MAX4193 are compatible with most battery voltages, operating from 2.0V to 16.5V.The devices are pin compatible with the Raytheon bipo-lar circuits, RC4191/2/3, while providing significantly improved efficiency and low-voltage operation. Maxim also manufactures the MAX631, MAX632, and MAX633DC-DC converters, which reduce the external compo-nent count in fixed-output 5V, 12V, and 15V circuits.See Table 2 at the end of this data sheet for a summary of other Maxim DC-DC converters.Applications+5V to +15V DC-DC ConvertersHigh-Efficiency Battery-Powered DC-DC Converters+3V to +5V DC-DC Converters 9V Battery Life ExtensionUninterruptible 5V Power Supplies5mW to 5W Switch-Mode Power SuppliesFeatures♦High Efficiency—85% (typ)♦70µA Typical Operating Current ♦1µA Maximum Quiescent Current ♦2.0V to 16.5V Operation♦525mA (Peak) Onboard Drive Capability ♦±1.5% Output Voltage Accuracy (MAX630)♦Low-Battery Detector♦Compact 8-Pin Mini-DIP and SO Packages ♦Pin Compatible with RC4191/2/3MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator________________________________________________________________Maxim Integrated Products 1Pin ConfigurationOrdering InformationTypical Operating Circuit19-0915; Rev 2; 9/08For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .*Dice are specified at T A = +25°C. Contact factory for dice specifications.**Contact factory for availability and processing to MIL-STD-883.†Contact factory for availibility.M A X 630/M A X 4193CMOS Micropower Step-Up Switching Regulator 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage.......................................................................18V Storage Temperature Range ............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C Operating Temperature RangeMAX630C, MAX4193C........................................0°C to +70°C MAX630E, MAX4193E.....................................-40°C to +85°C MAX630M, MAX4193M..................................-55°C to +125°CPower Dissipation8-Pin PDIP (derate 6.25mW/°C above +50°C).............468mW 8-Pin SO (derate 5.88mW/°C above +50°C)................441mW 8-Pin CERDIP (derate 8.33mW/°C above +50°C)........833mW Input Voltage (Pins 1, 2, 6, 7).....................-0.3V to (+V S + 0.3V)Output Voltage, L X and LBD..................................................18V L X Output Current..................................................525mA (Peak)LBD Output Current............................................................50mAMAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________3L X ON-RESISTANCE vs.TEMPERATURETEMPERATURE (°C)L X R O N (Ω)100755025-25-5024680125SUPPLY CURRENT vs.TEMPERATUREM A X 630/4193 t o c 02TEMPERATURE (°C)I S (μA )100755025-25-50402080601201001400125SUPPLY CURRENT vs.SUPPLY VOLTAGEM A X 630/4193 t o c 03+V S (V)I S (μA )14121086425015010025020030016Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)ELECTRICAL CHARACTERISTICSNote 1:Guaranteed by correlation with DC pulse measurements.Note 2:The operating frequency range is guaranteed by design and verified with sample testing.Detailed DescriptionThe operation of the MAX630 can best be understood by examining the voltage regulating loop of F igure 1.R1 and R2 divide the output voltage, which is com-pared with the 1.3V internal reference by comparator COMP1. When the output voltage is lower than desired,the comparator output goes high and the oscillator out-put pulses are passed through the NOR gate latch,turning on the output N-channel MOSFET at pin 3, L X .As long as the output voltage is less than the desired voltage, pin 3 drives the inductor with a series of pulses at the oscillator frequency.Each time the output N-channel MOSFET is turned on,the current through the external coil, L1, increases,storing energy in the coil. Each time the output turns off,the voltage across the coil reverses sign and the volt-age at L X rises until the catch diode, D1, is forward biased, delivering power to the output.When the output voltage reaches the desired level,1.31V x (1 + R1 / R2), the comparator output goes low and the inductor is no longer pulsed. Current is then supplied by the filter capacitor, C1, until the output volt-age drops below the threshold, and once again L X is switched on, repeating the cycle. The average duty cycle at L X is directly proportional to the output current.Output Driver (L X Pin)The MAX630/MAX4193 output device is a large N-channel MOSFET with an on-resistance of 4Ωand a peak current rating of 525mA. One well-known advan-tage that MOSF ETs have over bipolar transistors in switching applications is higher speed, which reduces switching losses and allows the use of smaller, lighter,less costly magnetic components. Also important is that MOSF ETs, unlike bipolar transistors, do not require base current that, in low-power DC-DC converters,often accounts for a major portion of input power.The operating current of the MAX630 and MAX4193increases by approximately 1µA/kHz at maximum power output due to the charging current required by the gate capacitance of the L X output driver (e.g., 40µA increase at a 40kHz operating frequency). In compari-son, equivalent bipolar circuits typically drive their NPN L X output device with 2mA of base drive, causing the bipolar circuit’s operating current to increase by a fac-tor of 10 between no load and full load.OscillatorThe oscillator frequency is set by a single external, low-cost ceramic capacitor connected to pin 2, C X . 47pF sets the oscillator to 40kHz, a reasonable compromise between lower switching losses at low frequencies and reduced inductor size at higher frequencies.M A X 630/M A X 4193CMOS Micropower Step-Up Switching Regulator 4_______________________________________________________________________________________Low-Battery DetectorThe low-battery detector compares the voltage on LBR with the internal 1.31V reference. The output, LBD, is an open-drain N-channel MOSFET. In addition to detecting and warning of a low battery voltage, the comparator can also perform other voltage-monitoring operations such as power-failure detection.Another use of the low-battery detector is to lower the oscillator frequency when the input voltage goes below a specified level. Lowering the oscillator frequency increases the available output power, compensating for the decrease in available power caused by reduced input voltage (see Figure 5).Logic-Level Shutdown InputThe shutdown mode is entered whenever I C (pin 6) is driven below 0.2V or left floating. When shut down, theMAX630’s analog circuitry, oscillator, L X , and LBD out-puts are turned off. The device’s quiescent current dur-ing shutdown is typically 10nA (1µA max).Bootstrapped OperationIn most circuits, the preferred source of +V S voltage for the MAX630 and MAX4193 is the boosted output volt-age. This is often referred to as a “bootstrapped” oper-ation since the circuit figuratively “lifts” itself up.The on-resistance of the N-channel L X output decreas-es with an increase in +V S ; however, the device operat-ing current goes up with +V S (see the Typical Operating Characteristics , I S vs. +V S graph). In circuits with very low output current and input voltages greater than 3V, it may be more efficient to connect +V S direct-ly to the input voltage rather than bootstrap.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________5Figure 1. +5V to +15V Converter and Block DiagramM A X 630/M A X 4193External ComponentsResistorsSince the LBR and V FB input bias currents are specified as 10nA (max), the current in the dividers R1/R2 and R3/R4 (Figure 1) may be as low as 1µA without signifi-cantly affecting accuracy. Normally R2 and R4 are between 10k Ωand 1M Ω, which sets the current in the voltage-dividers in the 1.3µA to 130µA range. R1 and R3 can then be calculated as follows:where V OUT is the desired output voltage and V LB isthe desired low-battery warning threshold.If the I C (shutdown) input is pulled up through a resistor rather than connected directly to +V S , the current through the pullup resistor should be a minimum of 4µAInductor ValueThe available output current from a DC-DC voltageboost converter is a function of the input voltage, exter-nal inductor value, output voltage, and the operating frequency.The inductor must 1) have the correct inductance, 2) be able to handle the required peak currents, and 3) have acceptable series resistance and core losses. If the inductance is too high, the MAX630 will not be able to deliver the desired output power, even with the L X out-put on for every oscillator cycle. The available output power can be increased by either decreasing the inductance or the frequency. Reducing the frequency increases the on-period of the L X output, thereby increasing the peak inductor current. The available out-put power is increased since it is proportional to the square of the peak inductor current (I PK ).where P OUT includes the power dissipated in the catchdiode (D1) as well as that in the load. If the inductance is too low, the current at L X may exceed the maximum rating. The minimum allowed inductor value is expressed by:where I MAX ≈525mA (peak L X current) and t ON is the on-time of the L X output.The most common MAX630 circuit is a boost-mode converter (Figure 1). When the N-channel output device is on, the current linearly rises since:At the end of the on-time (14µs for 40kHz, 55% duty-cycle oscillator) the current is:The energy in the coil is:At maximum load, this cycle is repeated 40,000 timesper second, and the power transferred through the coil is 40,000 x 5.25 = 210mW. Since the coil only supplies the voltage above the input voltage, at 15V, the DC-DC converter can supply 210mW / (15V - 5V) = 21mA. The coil provides 210mW and the battery directly supplies another 105mW, for a total of 315mW of output power. If the load draws less than 21mA, the MAX630 turns on its output only often enough to keep the output voltage at a constant 15V.Reducing the inductor value increases the available output current: lower L increases the peak current,thereby increasing the available power. The external inductor required by the MAX630 is readily obtained from a variety of suppliers (Table 1). Standard coils are suitable for most applications.Types of InductorsMolded InductorsThese are cylindrically wound coils that look similar to 1W resistors. They have the advantages of low cost and ease of handling, but have higher resistance, higher losses, and lower power handling capability than other types.102112131131104134131131ΩΩΩΩ≤≤=−≤≤=− .. ..R M R R x V VR M R R x V VOUTLBCMOS Micropower Step-Up Switching Regulator 6_______________________________________________________________________________________Potted Toroidal InductorsA typical 1mH, 0.82Ωpotted toroidal inductor (Dale TE-3Q4TA) is 0.685in in diameter by 0.385in high and mounts directly onto a PC board by its leads. Such devices offer high efficiency and mounting ease, but at a somewhat higher cost than molded inductors.Ferrite Cores (Pot Cores)Pot cores are very popular as switch-mode inductors since they offer high performance and ease of design.The coils are generally wound on a plastic bobbin,which is then placed between two pot core sections. A simple clip to hold the core sections together com-pletes the inductor. Smaller pot cores mount directly onto PC boards through the bobbin terminals. Cores come in a wide variety of sizes, often with the center posts ground down to provide an air gap. The gap pre-vents saturation while accurately defining the induc-tance per turn squared.Pot cores are suitable for all DC-DC converters, but are usually used in the higher power applications. They are also useful for experimentation since it is easy to wind coils onto the plastic bobbins.Toroidal CoresIn volume production, the toroidal core offers high per-formance, low size and weight, and low cost. They are,however, slightly more difficult for prototyping, in that manually winding turns onto a toroid is more tedious than on the plastic bobbins used with pot cores.Toroids are more efficient for a given size since the flux is more evenly distributed than in a pot core, where the effective core area differs between the post, side, top,and bottom.Since it is difficult to gap a toroid, manufacturers produce toroids using a mixture of ferromagnetic powder (typically iron or Mo-Permalloy powder) and a binder. The perme-ability is controlled by varying the amount of binder,which changes the effective gap between the ferromag-netic particles. Mo-Permalloy powder (MPP) cores have lower losses and are recommended for the highest effi-ciency, while iron powder cores are lower cost.DiodesIn most MAX630 circuits, the inductor current returns to zero before L X turns on for the next output pulse. This allows the use of slow turn-off diodes. On the other hand, the diode current abruptly goes from zero to full peak current each time L X switches off (Figure 1, D1).To avoid excessive losses, the diode must therefore have a fast turn-on time.F or low-power circuits with peak currents less than 100mA, signal diodes such as 1N4148s perform well.For higher-current circuits, or for maximum efficiency at low power, the 1N5817 series of Schottky diodes are recommended. Although 1N4001s and other general-purpose rectifiers are rated for high currents, they are unacceptable because their slow turn-on time results in excessive losses.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________7Table 1. Coil and Core ManufacturersM A X 630/M A X 4193Filter CapacitorThe output-voltage ripple has two components, with approximately 90 degrees phase difference between them. One component is created by the change in the capacitor’s stored charge with each output pulse. The other ripple component is the product of the capacitor’s charge/discharge current and its effective series resis-tance (ESR). With low-cost aluminum electrolytic capacitors, the ESR-produced ripple is generally larger than that caused by the change in charge.where V IN is the coil input voltage, L is its inductance, f is the oscillator frequency, and ESR is the equivalent series resistance of the filter capacitor.The output ripple resulting from the change in charge on the filter capacitor is:where t CHG and t DIS are the charge and dischargetimes for the inductor (1/2f can be used for nominal cal-culations).Oscillator Capacitor, C XThe oscillator capacitor, C X , is a noncritical ceramic or silver mica capacitor. C X can also be calculated by:where f is the desired operating frequency in Hertz, and C INT is the sum of the stray capacitance on the C X pin and the internal capacitance of the package. The internal capacitance is typically 1pF for the plastic package and 3pF for the CERDIP package. Typical stray capacitances are about 3pF for normal PC board layouts, but will be significantly higher if a socket is used.Bypassing and CompensationSince the inductor-charging current can be relatively large, high currents can flow through the ground con-nection of the MAX630/MAX4193. To prevent unwanted feedback, the impedance of the ground path must be as low as possible, and supply bypassing should be used for the device.When large values (>50k Ω) are used for the voltage-setting resistors, R1 and R2 of F igure 1, stray capaci-tance at the V FB input can add a lag to the feedback response, destabilizing the regulator, increasing low-frequency ripple, and lowering efficiency. This can often be avoided by minimizing the stray capacitance at the V FB node. It can also be remedied by adding a lead compensation capacitor of 100pF to 10nF in paral-lel with R1 in Figure 1.DC-DC Converter ConfigurationsDC-DC converters come in three basic topologies:buck, boost, and buck-boost (Figure 2). The MAX630 is usually operated in the positive-voltage boost circuit,where the output voltage is greater than the input.The boost circuit is used where the input voltage is always less than the desired output and the buck circuit is used where the input is greater than the output. Thebuck-boost circuit inverts, and can be used with, inputCMOS Micropower Step-Up Switching Regulator 8_______________________________________________________________________________________Figure 2. DC-DC Converter Configurationsvoltages that are either greater or less than the output. DC-DC converters can also be classified by the control method. The two most common are pulse-width modu-lation (PWM) and pulse-frequency modulation (PF M). PWM switch-mode power-supply ICs (of which current-mode control is one variant) are well-established in high-power off-line switchers. Both PWM and PF M cir-cuits control the output voltage by varying duty cycle. In the PWM circuit, the frequency is held constant and the width of each pulse is varied. In the PFM circuit, the pulse width is held constant and duty cycle is con-trolled by changing the pulse repetition rate.The MAX630 refines the basic PFM by employing a con-stant-frequency oscillator. Its output MOSFET is switched on when the oscillator is high and the output voltages is lower than desired. If the output voltage is higher than desired, the MOSFET output is disabled for that oscillator cycle. This pulse skipping varies the average duty cycle, and thereby controls the output voltage.Note that, unlike the PWM ICs, which use an op amp as the control element, the MAX630 uses a comparator tocompare the output voltage to an onboard reference. This reduces the number of external components and operating current.Typical Applications+5V to +15V DC-DC Converter Figure 1 shows a simple circuit that generates +15V at approximately 20mA from a +5V input. The MAX630 has a ±1.5% reference accuracy, so the output voltage has an untrimmed accuracy of ±3.5% if R1 and R2 are 1% resistors. Other output voltages can also be select-ed by changing the feedback resistors. Capacitor C X sets the oscillator frequency (47pF = 40kHz), while C1 limits output ripple to about 50mV.With a low-cost molded inductor, the circuit’s efficiency is about 75%, but an inductor with lower series resis-tance such as the Dale TE3Q4TA increases efficiency to around 85%. A key to high efficiency is that the MAX630 itself is powered from the +15V output. This provides the onboard N-channel output device with 15V gate drive, lowering its on-resistance to about 4Ω. When +5V power is first applied, current flows through L1 and D1, supplying the MAX630 with 4.4V for startup.+5V to ±15V DC-DC Converter The circuit in F igure 3 is similar to that of F igure 1 except that two more windings are added to the induc-tor. The 1408 (14mm x 8mm) pot core specified is an IEC standard size available from many manufacturers (see Table 1). The -15V output is semiregulated, typi-cally varying from -13.6V to -14.4V as the +15V load current changes from no load to 20mA.2.5W, 3V to 5V DC-DC ConverterSome systems, although battery powered, need high currents for short periods, and then shut down to a low-power state. The extra circuitry of Figure 4 is designed tomeet these high-current needs. Operating in the buck-boost or flyback mode, the circuit converts -3V to +5V.The left side of Figure 4 is similar to Figure 1 and sup-plies 15V for the gate drive of the external power MOS-FET. This 15V gate drive ensures that the external deviceis completely turned on and has low on-resistance.The right side of F igure 4 is a -3V to +5V buck-boost converter. This circuit has the advantage that when theMAX630 is turned off, the output voltage falls to 0V,unlike the standard boost circuit, where the output volt-age is V BATT- 0.6V when the converter is shut down.When shut down, this circuit uses less than 10µA, withmost of the current being the leakage current of the power MOSFET.The inductor and output-filter capacitor values havebeen selected to accommodate the increased power levels. With the values indicated, this circuit can supplyup to 500mA at 5V, with 85% efficiency. Since the leftside of the circuit powers only the right-hand MAX630,the circuit starts up with battery voltages as low as1.5V, independent of the loading on the +5V output.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator _______________________________________________________________________________________9M A X 630/M A X 4193+3V Battery to +5V DC-DC ConverterA common power-supply requirement involves conver-sion of a 2.4V or 3V battery voltage to a 5V logic sup-ply. The circuit in Figure 5 converts 3V to 5V at 40mA with 85% efficiency. When I C (pin 6) is driven low, the output voltage will be the battery voltage minus the drop across diode D1.The optional circuitry using C1, R3, and R4 lowers the oscillator frequency when the battery voltage falls to 2.0V. This lower frequency maintains the output-power capability of the circuit by increasing the peak inductor current, compensating for the reduced battery voltage.Uninterruptable +5V SupplyIn Figure 6, the MAX630 provides a continuous supply of regulated +5V, with automatic switchover between line power and battery backup. When the line-powered input voltage is at +5V, it provides 4.4V to the MAX630and trickle charges the battery. If the line-powered input falls below the battery voltage, the 3.6V battery supplies power to the MAX630, which boosts the bat-tery voltage up to +5V, thus maintaining a continuous supply to the uninterruptable +5V bus. Since the +5V output is always supplied through the MAX630, there are no power spikes or glitches during power transfer.The MAX630’s low-battery detector monitors the line-powered +5V, and the LBD output can be used to shut down unnecessary sections of the system during power failures. Alternatively, the low-battery detector could monitor the NiCad battery voltage and provide warning of power loss when the battery is nearly discharged.Unlike battery backup systems that use 9V batteries,this circuit does not need +12V or +15V to recharge the battery. Consequently, it can be used to provide +5V backup on modules or circuit cards that only have 5V available.9V Battery Life ExtenderFigure 7’s circuit provides a minimum of 7V until the 9V battery voltage falls to less than 2V. When the battery voltage is above 7V, the MAX630’s I C pin is low, putting it into the shutdown mode that draws only 10nA. When the battery voltage falls to 7V, the MAX8212 voltage detector’s output goes high, enabling the MAX630. The MAX630 then maintains the output voltage at 7V, even as the battery voltage falls below 7V. The LBD is used to decrease the oscillator frequency when the battery voltage falls to 3V, thereby increasing the output cur-rent capability of the circuit.CMOS Micropower Step-Up Switching Regulator 10______________________________________________________________________________________Figure 4. High-Power 3V to 5V Converter with ShutdownNote that this circuit (with or without the MAX8212) can be used to provide 5V from four alkaline cells. The initial volt-age is approximately 6V, and the output is maintained at 5V even when the battery voltage falls to less than 2V.Dual-Tracking RegulatorA MAX634 inverting regulator is combined with a MAX630 in F igure 8 to provide a dual-tracking ±15Voutput from a 9V battery. The reference for the -15V output is derived from the positive output through R3and R4. Both regulators are set to maximize output power at low-battery voltage by reducing the oscillator frequency, through LBR, when V BATT falls to 7.2V.MAX630/MAX4193Switching Regulator______________________________________________________________________________________11Figure 5. 3V to 5V Converter with Low-Battery Frequency ShiftFigure 7. Battery Life Extension Down to 3V InFigure 6. Uninterruptable +5V SupplyM A X 630/M A X 4193Switching Regulator 12______________________________________________________________________________________Table 2. Maxim DC-DC ConvertersFigure 8. ±12V Dual-Tracking RegulatorMAX630/MAX4193Switching Regulator______________________________________________________________________________________13Package InformationFor the latest package outline information, go to /packages .Chip TopographyLBR17I CV FB6230.089"(2.26mm)C XL XM A X 630/M A X 4193Switching Regulator Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.14____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.Revision History。

MAX6633资料

General DescriptionThe MAX6633/MAX6634/MAX6635 combine a tempera-ture sensor, a programmable overtemperature alarm,and an SMBus™/I 2C™-compatible serial interface into a single package. They convert their die temperatures into digital values using internal analog-to-digital con-verters (ADCs). The result of the conversion is then held in a temperature register as a 12-bit + sign value, allow-ing 0.0625°C resolution, readable at any time through the serial interface. The devices are capable of reading temperatures up to +150°C.The MAX6633/MAX6634/MAX6635 feature a shutdown mode that saves power by turning off everything except the power-on reset (POR) and the serial interface. The devices can be configured to separate addresses,allowing multiple devices to be used on the same bus.The MAX6633 has four address pins, allowing up to 16devices to be connected to a single bus. The MAX6634has three address pins, allowing up to eight devices to be connected to a single bus. The MAX6635 has two address pins, allowing up to four devices to be con-nected to a single bus.The MAX6633/MAX6634/MAX6635 make temperature data available for transfer over the serial interface. The MAX6634 incorporates a dual-mode ALERT output (open drain) and can serve as an upgraded alternative to the LM75. The MAX6635 includes an ALERT output and an OVERT output (both open drain) and can func-tion as an upgraded replacement for the LM76 in most applications. The MAX6634/MAX6635 feature user-pro-grammable temperature thresholds. All three devices come in an 8-pin SO package.ApplicationsBattery Temperature Alarms PC Temperature Control Automotive EquipmentFeatureso +3V to +5.5V Supply Range o Accuracy±1°C max (0°C to +50°C)±1.5°C max (-20°C to +85°C)±2.5°C max (-40°C to +125°C)±2.5°C typ (+150°C)o User-Programmable Temperature Thresholds (MAX6634/MAX6635)o User-Configurable Alarm Output(s)(MAX6634/MAX6635)o Ability to Respond to SMBus/I 2C-Compatible Alert Response Address (MAX6634/MAX6635)o OVERT Output for System Shutdown (MAX6635)o Multiple Devices per Bus16 devices (MAX6633)8 devices (MAX6634)4 devices (MAX6635)MAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface________________________________________________________________Maxim Integrated Products 1Ordering Information19-2120; Rev 0; 8/01For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .SMBus is a trademark of Intel Corp.I 2C is a trademark of Philips Corp.Typical Operating CircuitPin Configurations appear at end of data sheet.M A X 6633/M A X 6634/M A X 663512-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, T A = -55°C to +125°C, unless otherwise noted. Typical values are V CC = +3.3V, T A = +25°C, unless other-wise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC , SDA, SCL......................................................-0.3V to +6.0V All Other Pins ................................................-0.3V to V CC +0.3V SDA, ALERT , OVERT Current .............................-1mA to +50mA ESD Protection (Human Body Model)................................2000V Continuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.88mW/°C above +70°C)................471mWJunction Temperature......................................................+150°C Operating Temperature Range .........................-55°C to +150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s) ................................+300°CMAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)Note 2:Peak operating current measured during conversion. See Figure 4.Note 3:Guaranteed by design, not production tested.Note 4:A master device must provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of SCL ’s falling edge.M A X 6633/M A X 6634/M A X 663512-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface 4_______________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, T A = +25°C, unless otherwise noted.)504030200-5555110165SHUTDOWN SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S H U T D O W N S U P P L Y C U R R E N T (µA )104003002001000-5555110165AVERAGE SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)A V E R A G E S U P P L Y C U R R E N T (µA )5-11010k10MTEMPERATURE ERROR vs. SUPPLY NOISE FREQUENCYSUPPLY NOISE FREQUENCY (Hz)T E M P E R A T U R E E R R O R (°C )321403020104050607080901005101520RESPONSE TO THERMAL SHOCKTIME (s)T E M P E R A T U R E (°C)32-2-3-4040080120160TEMPERATURE ERROR vs. TEMPERATURETEMPERATURE (°C)T E M P E R A T U R E E R R O R (°C )Detailed Description The MAX6633/MAX6634/MAX6635 continuously con-vert their die temperatures into digital values using their integrated ADCs. The resulting data is readable at any time through the SMBus/I2C-compatible serial interface. The device functions as a slave on the SMBus inter-face, supporting Write Byte, Write Word, Read Byte, and Read Word commands. Separate addresses can be configured using the individual address pins. Figures 5, 6, and 7 show the functional diagrams of the MAX6633/MAX6634/MAX6635, respectively.SMBus/I2C-Compatible Operation The MAX6633/MAX6634/MAX6635 are readable and programmable through their SMBus/I2C-compatible serial interface. Figures 1, 2, and 3 show the timing details of the clock (SCL) and data (SDA) signals. The devices function as slaves on the SMBus and support Write Byte, Write Word, Read Byte, and Read Word commands. Figure 8 is the MAX6633/MAX6634/ MAX6635 programmer’s model.Addressing Separate addresses can be configured using the indi-vidual address pins. The address of each device is selected by connecting the address (A_) pins to one of two potentials: GND or V CC. The MAX6635 makes two address pins available (A0, A1), allowing up to four devices to be connected to a single bus line. The MAX6634 makes three address pins available (A0, A1, A2), allowing up to eight devices to be connected to a single bus line. The MAX6633 makes four address pins available (A0, A1, A2, A3), allowing as many as 16devices to be connected to a single bus line. Table 1 shows the full SMBus/I2C address for each device type.Control Registers (MAX6633)Three registers control the operation of the MAX6633 (Figure 5 and Tables 2 through 6). The Pointer registeris the first addressed and determines which of the othertwo registers is acted upon. The other two are the Temperature and Configuration registers. The tempera-ture value is stored as 12 bits plus a sign bit, read only,and contains the latest temperature data. The true reg-ister length is 16 bits, with the lower 3 unused in thispart. The digital temperature data contained in the tem-perature register is in °C, using a two’s-complement format with 1LSB corresponding to 0.0625°C.The Configuration register is 8 bits, read/write, and contains the SMBus timeout disable bit, fault queue enable bit, and the shutdown bit.Control Registers (MAX6634)Six registers control the operation of the MAX6634 (Figure 6 and Tables 2 through 7). The pointer registeris the first addressed and determines which of the otherfive registers is acted upon. The other five are the Temperature, Configuration, High-Temperature(T HIGH), Low-Temperature (T LOW), and Hysteresis(T HYST) registers. The temperature value is stored as12 bits plus a sign bit, read only, and contains the lat-est temperature data. The true register length is 16 bits,with the lowest 2 used as status bits, and the third bit(D2) is unused. The digital temperature data containedin the temperature register is in °C, using a two’s-com-plement format with 1LSB corresponding to 0.0625°C. MAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface_______________________________________________________________________________________5M A X 6633/M A X 6634/M A X 663512-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface6_______________________________________________________________________________________Figure 1. SMBus ProtocolsFigure 2. SMBus Write Timing Diagramcontains the SMBus timeout disable bit, fault queue enable bit, the temperature alarm output polarity select bits, the interrupt mode select bit, and the shutdownMAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface_______________________________________________________________________________________7Figure 3. SMBus Read Timing DiagramFigure 5. MAX6633 Functional DiagramM A X 6633/M A X 6634/M A X 663512-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface8_______________________________________________________________________________________Figure 7. MAX6635 Functional DiagramMAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface_______________________________________________________________________________________9Figure 8. MAX6633/MAX6634/MAX6635 Programmer’s ModelM A X 6633/M A X 6634/M A X 6635bit. Registers T HIGH and T LOW are 16 bits, read/write,and contain values that trigger ALERT and OVERT .Register T HYST is 16 bits, read/write, and contains the values by which the temperature must rise or fall beyond T HIGH , T LOW , or T MAX , before ALERT or OVERT deassert.Temperature ConversionAn on-chip bandgap reference produces a signal pro-portional to absolute temperature (PTAT), as well as the temperature-stable reference voltage necessary for the analog-to-digital conversion. The PTAT signal is digi-tized by the on-board ADC to a resolution of 0.0625°C.The resulting digital value is placed in the Temperature register. The temperature conversion runs continuously and asynchronously from the serial interface at a rate of 500ms per conversion. When the Temperature register is read, the conversion in progress is aborted. The bus transaction is completed by a stop condition.Fault Queue (MAX6634/MAX6635)A programmable fault queue on the MAX6634/MAX6635 eliminates spurious alarm activity in noisy environments. The queue sets the number of consecu-tive out-of-tolerance temperature readings that must occur before the ALERT or OVERT alarm outputs are toggled. An out-of-tolerance reading is above T HIGH or T MAX or below T LOW . The fault queue depth defaults to 1 at power-up and may be programmed —through the Configuration register —to four consecutive conver-sions. Any time the conversion result is in tolerance,and the particular alarm output is not asserted, the queue is cleared, even if it contains some out-of-toler-ance counts. Additionally, the fault queue automatically clears at power-up and in shutdown. Whenever the fault queue is cleared, the alarm outputs are deassert-ed. Figure 9 is the alarm output and reset diagram.12-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface 10______________________________________________________________________________________Temperature Alert (MAX6634/MAX6635)ALERT has programmable polarity and two modes:comparator and interrupt. Polarity and mode are select-ed through the Configuration register (Table 4). The ALERT output is open drain.Interrupt ModeWith ALERT in interrupt mode, the MAX6634/MAX6635look for a T HIGH or a T LOW fault. The ALERT pin asserts an alarm for an undertemperature fault, as well as for an overtemperature fault. Once either fault has occurred, it remains active until deasserted by a read of any register. The device then begins to look for a temperature change crossing the hysteresis level. The activation of ALERT is subject to the depth of the fault queue.For example: I f T HIGH is set to 100°C, T HYST is set to 20°C, and the fault queue depth is set to 4, ALERT does not assert until four consecutive conversions exceed 100°C. If the temperature is then read through the I 2C-compatible interface, ALERT deasserts. ALERT asserts again when four consecutive conversions are less than 80°C.Comparator ModeIn comparator mode, ALERT is asserted when the num-ber of consecutive conversions exceeding the value in the T HIGH register, or lower than the value in the T LOW register, is equal to the depth of the fault queue. ALERT deasserts when the number of consecutive conversionsless than T HIGH - T HYST or greater than T LOW + T HYST is equal to the depth of the fault queue.For example: I f T HIGH is set to 100°C, T LOW is set to 80°C, and the fault queue depth is set to four, ALERT does not assert until four consecutive conversions exceed 100°C, or are below 80°C. ALERT only deasserts if four consecutive conversions are less than T HIGH - T HYST or greater than T LOW + T HYST .Comparator mode allows autonomous clearing of an ALERT fault without the intervention of a master and is ideal to use for driving a thermostat (Figure 10).Overtemperature Alarm (MAX6635)The MAX6635 also includes an overtemperature output that is always in comparator mode. Whenever the tem-perature exceeds a value in the programmable T MAX register, OVERT is asserted. OVERT only deasserts after the temperature drops below T MAX - T HYST . When the fault queue is activated, OVERT is subject to that queue, which sets the number of faults that must occur before OVERT asserts or deasserts. This helps prevent spurious alarms in noisy environments.Comparator mode also allows autonomous clearing of an OVERT fault without the intervention of a master and thus is ideal to use for driving a cooling fan (Figure 11).In this application, the polarity of OVERT is active high.ShutdownThe MAX6633/MAX6634/MAX6635 feature a shutdown mode, accessible through the serial interface that saves power by turning off everything except the PORMAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface______________________________________________________________________________________11Figure 10. Simple Thermostat Figure 11. Fan ControllerM A X 6633/M A X 6634/M A X 6635and the serial interface. Enter shutdown by program-ming the shutdown bit of the Configuration register high. While in shutdown, the Temperature register retains the last conversion result and can be read at any time. The ADC is turned off, reducing the device current draw to 30µA (max). The outputs of ALERT and OVERT are latched upon entering shutdown, and the fault queue is held in reset. After coming out of shut-down, the Temperature register continues to read the last converted temperature, until the next conversion result is available.Thermal ConsiderationsThe MAX6633/MAX6634/MAX6635 supply current is typically 200µA when the serial interface is inactive.When used to drive high-impedance loads, the devices dissipate negligible power; therefore, the die tempera-ture is essentially the same as the package tempera-ture. The key to accurate temperature monitoring is good thermal contact between the MAX6633/MAX6634/MAX6635 package and the monitored device or circuit.Heat flows in and out of plastic packages primarily through the leads. Short, wide copper traces leading to the temperature monitor ensure that heat transfers quickly and reliably. The rise in die temperature due to self-heating is given by the following formula:∆T J = P DISSIPATION x θJA where P DISSIPATION is the power dissipated by the MAX6633/MAX6634/MAX6635, and θJA is the pack-age ’s thermal resistance.The typical thermal resistance is 170°C/W for the 8-pin SO package. To limit the effects of self-heating, mini-mize the output currents. For example, if the MAX6634/MAX6635 sink 4mA with the maximum ALERT V L specification of 0.8V, an additional 3.2mW of power is dissipated within the IC. This corresponds to a 0.54°C rise in the die temperature.Applications InformationFigure 10 shows the MAX6634 used as a simple thermo-stat to control a heating element. Figure 11 shows the MAX6635 used as a temperature-triggered fan controller.Chip InformationTRANSISTOR COUNT: 12,085PROCESS: BiCMOS12-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface 12______________________________________________________________________________________Table 1. Address SelectionMAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface______________________________________________________________________________________13Table 2. Pointer Register BitD2, D1, D0: Flag bits for T MAX , T HIGH , T LOW .1LSB = 0.0625°C.Temperature is stored in two ’s complement format.D0: 0 = normal operation; 1 = shutdown.D1: 0 = comparator mode; 1 = interrupt mode.D2 to D3: 0 = active low; 1 = active high.D5: 0 = normal SMBus operation; 1 = full I 2C compatibility.D7 to D6: Reserved locations, always write zeros.M A X 6633/M A X 6634/M A X 66351LSB = 1°C.Power-On Default: T HIGH = +64°C (2000h), T LOW = +10°C (0500h), T MAX = +80°C (2008h), T HYST = 2°C (0100h).12-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface 14______________________________________________________________________________________MAX6633/MAX6634/MAX663512-Bit Plus Sign Temperature Sensors withSMBus/I 2C-Compatible Serial Interface______________________________________________________________________________________15Pin ConfigurationsM A X 6633/M A X 6634/M A X 663512-Bit Plus Sign Temperature Sensors with SMBus/I 2C-Compatible Serial Interface Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.16____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2001 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information。

MAX6361LUT31资料

For free samples and the latest literature, visit or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.General DescriptionThe MAX6361–MAX6364 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in microprocessor (µP) systems. The circuits significantly improve system reliability and accuracy compared to that obtainable with separate ICs or discrete components.Their functions include µP reset, backup battery switchover, and power failure warning.The MAX6361–MAX6364 operate from supply voltages as low as +1.2V. The factory-preset reset threshold voltage ranges from 2.32V to 4.63V (see Ordering Information ).These devices provide a manual reset input (MAX6361),watchdog timer input (MAX6362), battery-on output (MAX6363), and an auxiliary adjustable reset input (MAX6364). In addition, each part type is offered in three reset output versions: an active-low open-drain reset, an active-low open-drain reset, and an active-high open-drain reset (see Selector Guide at end of data sheet).ApplicationsFeatures♦Low +1.2V Operating Supply Voltage (V CC or V BATT )♦Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages♦Debounced Manual Reset Input (MAX6361)♦Watchdog Timer with 1.6s Timeout Period (MAX6362)♦Battery-On Output Indicator (MAX6363)♦Auxiliary User-Adjustable RESET IN (MAX6364)♦Three Available Output StructuresPush-Pull RESET , Open-Drain RESET , Open-Drain RESET♦RESET/RESET Valid Down to 1.2V Guaranteed (V CC or V BATT )♦Power-Supply Transient Immunity ♦150ms (min) Reset Timeout Period ♦Small 6-Pin SOT23 PackageMAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuitswith Battery Backup________________________________________________________________Maxim Integrated Products119-1615; Rev 3; 11/05Ordering InformationPin ConfigurationsFrom the table below, select the suffix corresponding to the desired threshold voltage and insert it into the part number to complete it. When ordering from the factory, there is a 2500-piece minimum on the SOT package (tape-and-reel only).Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing "-T" with "+T" when ordering.Computers ControllersIntelligent Instruments Critical µP/µC Power MonitoringFax Machines Industrial Control POS EquipmentPortable/Battery-Powered EquipmentSelector Guide appears at end of data sheet.Typical Operating Circuit appears at end of data sheet.M A X 6361–M A X 6364SOT23, Low-Power µP Supervisory Circuits with Battery BackupABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.4V to +5.5V, V BATT = 3V, T A = -40°C to +85°C, reset not asserted. Typical values are at T A = +25°C, unless otherwise noted.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Terminal Voltages (with respect to GND)V CC , BATT, OUT.......................................................-0.3V to +6V RESET (open drain), RESET (open drain)................-0.3V to +6V BATT ON, RESET (push-pull), RESET IN,WDI.......................................................-0.3V to (V OUT + 0.3V)MR .............................................................-0.3V to (V CC + 0.3V)Input CurrentV CC Peak ............................................................................1A V CC Continuous............................................................250mA BATT Peak....................................................................250mA BATT Continuous............................................................40mAGND................................................................................75mA Output CurrentOUT................................Short-Circuit Protection for up to 10s RESET, RESET , BATT ON ..............................................20mA Continuous Power Dissipation (T A = +70°C)6-Pin SOT23 (derate 8.70mW/°C above +70°C) .........696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuitswith Battery Backup_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +2.4V to +5.5V, V BATT = 3V, T A = -40°C to +85°C, reset not asserted. Typical values are at T A = +25°C, unless otherwise noted.) (Note 1)Note 1:All devices are 100% production tested at T A = +25°C. Limits over temperature are guaranteed by design.Note 2:V BATT can be 0 anytime or V CC can go down to 0 if V BATT is active (except at startup).M A X 6361–M A X 6364SOT23, Low-Power µP Supervisory Circuits with Battery Backup 4_______________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)1214161820SUPPLY CURRENT vs. TEMPERATURE(NO LOAD)TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-402040-2060800.20.60.40.81.01.2BATTERY SUPPLY CURRENT (BACKUP MODE) vs. TEMPERATURETEMPERATURE (°C)B A T T E R Y S U P P L Y C U R R E N T (µA )-402040-20060801432567BATTERY TO OUT ON-RESISTANCEvs. TEMPERATURETEMPERATURE (°C)B A T T T O O U T O N -R E S I S T A NC E (Ω)-402040-20608000.30.90.61.2V CC TO OUT ON-RESISTANCEvs. TEMPERATURETEMPERATURE (°C)V O U T T O O U T O N -R E S I S T A N C E (Ω)-402040-206080190195205200210RESET TIMEOUT PERIOD vs. TEMPERATUREM A X 6361 t o c 05TEMPERATURE (°C)R E S E T T I M E O U T P E R I O D (m s )-402040-206080301575604513512010590V CC TO RESET PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E LA Y (µs )-402040-2060802.03.02.55.04.54.03.5RESET THRESHOLD vs. TEMPERATURETEMPERATURE (°C)T H R E S H O L D (V )-402040-2060801.21.41.31.61.51.91.81.72.0-40-2020406080MAX6362WATCHDOG TIMEOUT PERIODvs. TEMPERATUREM A X 6361t o c 06aTEMPERATURE (°C)W A T C H D O G T I M E O U T P E R I O D (s )1100101k10kMAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVERESET THRESHOLD OVERDRIVE V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N (µs )400300350250200050150100MAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuitswith Battery Backup1.2341.2351.236MAX6364RESET IN THRESHOLD vs. TEMPERATUREM A X 6361 t o c 10TEMPERATURE (°C)T H R E S H O L D (V )-402040-206080Typical Operating Characteristics (continued)(T A = +25°C, unless otherwise noted.)1.01.91.61.32.82.52.2MAX6364RESET IN TO RESET PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (µs )-402040-206080Pin Description0321456789101234BATTERY SUPPLY CURRENT vs. SUPPLY VOLTAGEV CC (V)B A T T E R Y S U P P L YC U R R E N T (µA )M A X 6361–M A X 6364Detailed DescriptionThe Typical Operating Circuit shows a typical connection for the MAX6361–MAX6364 family. OUT powers the stat-ic random-access memory (SRAM). OUT is internally connected to V CC if V CC is greater than the reset thresh-old, or to the greater of V CC or V BATT when V CC is less than the reset threshold. OUT can supply up to 150mA from V CC . When V CC is higher than V BATT , the BATT ON (MAX6363) output is low. When V CC is lower than V BATT ,an internal MOSF ET connects the backup battery to OUT. The on-resistance of the MOSFET is a function of backup-battery voltage and is shown in the Battery to Out On-Resistance vs. Temperature graph in the Typical Operating Characteristics section.Backup-Battery SwitchoverIn a brownout or power failure, it may be necessary to preserve the contents of the RAM. With a backup bat-tery installed at BATT, the MAX6361–MAX6364 auto-matically switch the RAM to backup power when V CC falls. The MAX6363 has a BATT ON output that goes high when in battery-backup mode. These devices require two conditions before switching to battery-backup mode:1)V CC must be below the reset threshold.2)V CC must be below V BATT .Table 1 lists the status of the inputs and outputs in bat-tery-backup mode. The device will not power up if the only voltage source is on BATT. OUT will only power up from V CC at startup.Manual Reset Input (MAX6361 Only)Many µP-based products require manual reset capabili-ty, allowing the operator, a test technician, or external logic circuitry to initiate a reset. For the MAX6361, a logic low on MR asserts reset. Reset remains asserted while MR is low, and for a minimum of 150ms (t RP ) after it returns high. MR has an internal 20k Ωpull-up resistor to V CC . This input can be driven with TTL/CMOS logic lev-els or with open-drain/collector outputs. Connect a nor-mally open momentary switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or the device is used in a noisy environment, connect a 0.1µF capacitor from MR to GND to provide additional noise immunity.Watchdog Input (MAX6362 Only)The watchdog monitors µP activity through the input WDI. If the µP becomes inactive, the reset output is asserted in pulses. To use the watchdog function, con-nect WDI to a bus line or µP I/O line. A change of state(high to low or low to high) within the watchdog timeout period (t WD ) with a 100ns minimum pulse width clears the watchdog timer. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer runs out and a reset pulse is triggered for the reset timeout period (t RP ). The internal watchdog timer clears whenever reset asserts or the WDI sees a rising or falling edge within the watchdog timeout period. If WDI remains in a high or low state for an extended period of time, a reset pulse asserts after every watchdog timeout period (t WD ) (Figure 1).Reset In (MAX6364 Only)RESET IN is compared to an internal 1.235V reference.If the voltage at RESET IN is less than 1.235V, reset is asserted. The RESET IN comparator may be used as an undervoltage detector to signal a failing power sup-ply. It can also be used as a secondary power-supply reset monitor.To program the reset threshold (V RTH ) of the secondary power supply, use the following equation (see Typical Operating Circuit ):where V REF = 1.235V. To simplify the resistor selection,choose a value for R2 and calculate R1:Since the input current at RESET IN is 25nA (max), large values (up to 1M Ω) can be used for R2 with no signifi-cant loss in accuracy. F or example, in the TypicalSOT23, Low-Power µP Supervisory Circuits with Battery Backup 6_______________________________________________________________________________________R R V V RTH REF 121 /=()−[]MAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuitswith Battery Backup_______________________________________________________________________________________7Operating Circuit,the MAX6362 monitors two supply voltages. To monitor the secondary 5V logic or analog supply with a 4.60V nominal programmed reset thresh-old, choose R2 = 100k Ω, and calculate R1 = 273k Ω.Reset OutputA µP’s reset input starts the µP in a known state. The MAX6361–MAX6364 µP supervisory circuits assert a reset to prevent code-execution errors during power-up, power-down, and brownout conditions. RESET is guaranteed to be a logic low or high depending on the device chosen (see Ordering Information ). RESET or RESET asserts when V CC is below the reset threshold and for at least 150ms (t RP ) after V CC rises above the reset threshold. RESET or RESET also asserts when MR is low (MAX6361) and when RESET IN is less than 1.235V (MAX6364). The MAX6362 watchdog function will cause RESET (or RESET ) to assert in pulses follow-ing a watchdog timeout (Figure 1).Applications InformationOperation Without a BackupPower SourceThe MAX6361–MAX6364 were designed for battery-backed applications. If a backup battery is not used,connect V CC to OUT and connect BATT to GND.Replacing the Backup BatteryIf BATT is decoupled with a 0.1µF capacitor to ground,the backup power source can be removed while V CC remains valid without danger of triggering a reset pulse.The device does not enter battery-backup mode when V CC stays above the reset threshold voltage.Negative-Going V CC TransientsThese supervisors are relatively immune to short-dura-tion, negative-going V CC transients. Resetting the µPwhen V CC experiences only small glitches is usually not desirable.The Typical Operating Characteristics section shows a graph of Maximum Transient Duration vs. Reset Threshold Overdrive for which reset is not asserted.The graph was produced using negative-going V CC pulses, starting at V CC and ending below the reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going V CC transient can typically have without triggering a reset pulse. As the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a V CC transient that goes 100mV below the reset threshold and lasts for 30µs will not trigger a reset pulse.A 0.1µF bypass capacitor mounted close to the V CC pin provides additional transient immunity.Figure 1. MAX6362 Watchdog Timeout Period and Reset Active TimeM A X 6361–M A X 6364Watchdog Software Considerations(MAX6362 Only)To help the watchdog timer monitor software execution more closely, set and reset the watchdog input at dif-ferent points in the program, rather than “pulsing” the watchdog input low-high-low. This technique avoids a “stuck” loop, in which the watchdog timer would contin-ue to be reset within the loop, keeping the watchdog from timing out. F igure 2 shows an example of a flow diagram where the I/O driving the WDI is set low at the beginning of the program, set high at the beginning of every subroutine or loop, then set low again when the program returns to the beginning. If the program should “hang” in any subroutine, the problem would quickly be corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, trigger-ing a reset.SOT23, Low-Power µP Supervisory Circuits with Battery Backup 8_______________________________________________________________________________________Figure 2. Watchdog Flow DiagramMAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuitswith Battery Backup_______________________________________________________________________________________9*Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions.Device Marking CodesSelector GuideM A X 6361–M A X 6364SOT23, Low-Power µP Supervisory Circuits with Battery Backup 10______________________________________________________________________________________Pin Configurations (continued)Typical Operating CircuitChip InformationTRANSISTOR COUNT: 720MAX6361–MAX6364SOT23, Low-Power µP Supervisory Circuits with Battery Backup______________________________________________________________________________________11Package InformationM A X 6361–M A X 6364SOT23, Low-Power µP Supervisory Circuits with Battery BackupMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.12____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.NOTES。

MAX312中文资料

元器件交易网
10Ω, Quad, SPST, CMOS Analog Switches MAX312/MAX313/MAX314
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+ ...........................................................................-0.3V to +44V V- ............................................................................+0.3V to -44V V+ to V-...................................................................-0.3V to +44V VL .....................................................(GND - 0.3V) to (V+ + 0.3V) All Other Pins (Note 1) ................................(V- - 2V) to (V+ + 2V) or 30mA (whichever occurs first) Continuous Current (COM_, NO_, NC_).........................±100mA Peak Current (COM_, NO_, NC_) ...................................±300mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW Narrow SO (derate 8.70mW/°C above +70°C) ............696mW CERDIP (derate 10.00mW/°C above +70°C) ...............800mW TSSOP (derate 6.7mW/°C above +70°C) ....................457mW Operating Temperature Ranges MAX31_C_ ..........................................................0°C to +70°C MAX31_E_ .......................................................-40°C to +85°C MAX31_M_.....................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C

MAX6321HPUK26DZ-T中文资料

___________________________________________________________________Selector Guide________________General DescriptionThe MAX6316–MAX6322 family of microprocessor (µP)supervisory circuits monitors power supplies and microprocessor activity in digital systems. It offers sev-eral combinations of push/pull, open-drain, and bidirec-tional (such as Motorola 68HC11) reset outputs, along with watchdog and manual reset features. The Selector Guide below lists the specific functions available from each device. These devices are specifically designed to ignore fast negative transients on V CC . Resets are guaranteed valid for V CC down to 1V.These devices are available in 26 factory-trimmed reset threshold voltages (from 2.5V to 5V, in 100mV incre-ments), featuring four minimum power-on reset timeout periods (from 1ms to 1.12s), and four watchdog timeout periods (from 6.3ms to 25.6s). Thirteen standard ver-sions are available with an order increment requirement of 2500 pieces (see Standard Versions table); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces.The MAX6316–MAX6322 are offered in a miniature 5-pin SOT23 package.________________________ApplicationsPortable Computers Computers ControllersIntelligent InstrumentsPortable/Battery-Powered Equipment Embedded Control Systems____________________________Features♦Small 5-Pin SOT23 Package♦Available in 26 Reset Threshold Voltages2.5V to 5V, in 100mV Increments ♦Four Reset Timeout Periods1ms, 20ms, 140ms, or 1.12s (min)♦Four Watchdog Timeout Periods6.3ms, 102ms, 1.6s, or 25.6s (typ) ♦Four Reset Output StagesActive-High, Push/Pull Active-Low, Push/Pull Active-Low, Open-Drain Active-Low, Bidirectional♦Guaranteed Reset Valid to V CC = 1V♦Immune to Short Negative V CC Transients ♦Low Cost♦No External ComponentsMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset________________________________________________________________Maxim Integrated Products 119-0496; Rev 7; 11/07_______________Ordering InformationOrdering Information continued at end of data sheet.*The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.Typical Operating Circuit and Pin Configurations appear at end of data sheet.For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Specify lead-free by replacing “-T” with “+T” when ordering.ELECTRICAL CHARACTERISTICS(V CC = 2.5V to 5.5V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)M A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltage (with respect to GND)V CC ......................................................................-0.3V to +6V RESET (MAX6320/MAX6321/MAX6322 only)...... -0.3V to +6V All Other Pins.........................................-0.3V to (V CC + 0.3V)Input/Output Current, All Pins.............................................20mAContinuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C)...............571mW Operating Temperature Range..........................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range..............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°CTH available in 100mV increments from 2.5V to 5V (see Table 1 at end of data sheet).Note 3:Guaranteed by design.MAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________3Note 5:Measured from RESET V OL to (0.8 x V CC ), R LOAD = ∞.Note 6:WDI is internally serviced within the watchdog period if WDI is left unconnected.Note 7:The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capac-itive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.ELECTRICAL CHARACTERISTICS (continued)M A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)021*********-4020-20406080100MAX6316/MAX6317/MAX6318/MAX6320/MAX6321SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )302010504090807060100-40-20020406080100V CC FALLING TO RESET PROPAGATIONDELAY vs. TEMPERATURETEMPERATURE (°C)R E S E T P R O P A G A T I O N D E L A Y (μs )140180160240220200300280260320-40020-20406080100MAX6316/MAX6317/MAX6319/MAX6320/MAX6322MANUAL RESET TO RESETPROPAGATION DELAY vs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )0.950.980.970.961.000.991.041.031.021.011.05-40-2020406080100NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATUREM A X 6316t o c 04TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D0.950.980.970.961.000.991.041.031.021.011.05-40-2020406080100MAX6316/MAX6317/MAX6318/MAX6320/MAX6321NORMALIZED WATCHDOG TIMEOUTPERIOD vs. TEMPERATUREM A X 6316t o c 05TEMPERATURE (°C)N O R M A L I Z E D W A T C H D O G T I M E O U T P E R I O D800101001000MAXIMUM V CC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE2010RESET THRESHOLD OVERDRIVE (mV) V RST - V CCT RA N S I E N T D U R A T I O N (μs )3050604070200ns/divMAX6316M/6318MH/6319MHBIDIRECTIONALPULLUP CHARACTERISTICSMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________5______________________________________________________________Pin DescriptionM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 6______________________________________________________________________________________________________Detailed DescriptionA microprocessor’s (µP) reset input starts or restarts the µP in a known state. The reset output of the MAX6316–MAX6322 µP supervisory circuits interfaces with the reset input of the µP, preventing code-execution errors during power-up, power-down, and brownout condi-tions (see the Typical Operating Circuit ). The MAX6316/MAX6317/MAX6318/MAX6320/MAX6321 are also capa-ble of asserting a reset should the µP become stuck in an infinite loop.Reset OutputThe MAX6316L/MAX6318LH/MAX6319LH feature an active-low reset output, while the MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP feature an active-high reset output. RESET is guaran-teed to be a logic low and RESET is guaranteed to be a logic high for V CC down to 1V.The MAX6316–MAX6322 assert reset when V CC is below the reset threshold (V RST ), when MR is pulled low (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP only), or if the WDI pin is not serviced withinthe watchdog timeout period (t WD ). Reset remains assert-ed for the specified reset active timeout period (t RP ) after V CC rises above the reset threshold, after MR transitions low to high, or after the watchdog timer asserts the reset (MAX6316_/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP). After the reset active timeout period (t RP )expires, the reset output deasserts, and the watchdog timer restarts from zero (Figure 2).Figure 1. Functional DiagramFigure 2. Reset Timing DiagramMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________7Bidirectional R E S E T OutputThe MAX6316M/MAX6318MH/MAX6319MH are designed to interface with µPs that have bidirectional reset pins,such as the Motorola 68HC11. Like an open-drain output,these devices allow the µP or other devices to pull the bidirectional reset (RESET ) low and assert a reset condi-tion. However, unlike a standard open-drain output, it includes the commonly specified 4.7k Ωpullup resistor with a P-channel active pullup in parallel.This configuration allows the MAX6316M/MAX6318MH/MAX6319MH to solve a problem associated with µPs that have bidirectional reset pins in systems where sev-eral devices connect to RESET (F igure 3). These µPs can often determine if a reset was asserted by an exter-nal device (i.e., the supervisor IC) or by the µP itself (due to a watchdog fault, clock error, or other source),and then jump to a vector appropriate for the source of the reset. However, if the µP does assert reset, it does not retain the information, but must determine the cause after the reset has occurred.The following procedure describes how this is done in the Motorola 68HC11. In all cases of reset, the µP pulls RESET low for about four external-clock cycles. It then releases RESET , waits for two external-clock cycles,then checks RESET ’s state. If RESET is still low, the µP concludes that the source of the reset was external and, when RESET eventually reaches the high state, it jumps to the normal reset vector. In this case, stored-state information is erased and processing begins fromscratch. If, on the other hand, RESET is high after a delay of two external-clock cycles, the processor knows that it caused the reset itself and can jump to a different vector and use stored-state information to determine what caused the reset.A problem occurs with faster µPs; two external-clock cycles are only 500ns at 4MHz. When there are several devices on the reset line, and only a passive pullup resis-tor is used, the input capacitance and stray capacitance can prevent RESET from reaching the logic high state (0.8✕V CC ) in the time allowed. If this happens, all resets will be interpreted as external. The µP output stage is guaran-teed to sink 1.6mA, so the rise time can not be reduced considerably by decreasing the 4.7k Ωinternal pullup resistance. See Bidirectional Pullup Characteristics in the Typical Operating Characteristics .The MAX6316M/MAX6318MH/MAX6319MH overcome this problem with an active pullup FET in parallel with the 4.7k Ωresistor (F igures 4 and 5). The pullup transistor holds RESET high until the µP reset I/O or the supervisory circuit itself forces the line low. Once RESET goes below V PTH , a comparator sets the transition edge flip-flop, indi-cating that the next transition for RESET will be low to high. When RESET is released, the 4.7k Ωresistor pulls RESET up toward V CC . Once RESET rises above V PTH but is below (0.85 x V CC ), the active P-channel pullup turns on. Once RESET rises above (0.85 x V CC ) or the 2µs one-shot times out, the active pullup turns off. The parallel combination of the 4.7k Ωpullup and theFigure 3. MAX6316M/MAX6318MH/MAX6319MH Supports Additional Devices on the Reset BusM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 8_______________________________________________________________________________________Figure 4. MAX6316/MAX6318MH/MAX6319MH Bidirectional Reset Output Functional DiagramMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________9P-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition from low to high within the required two elec-tronic-clock cycles, even with several devices on the reset line. This process occurs regardless of whether the reset was caused by V CC dipping below the reset threshold, the watchdog timing out, MR being asserted,or the µP or other device asserting RESET . The parts do not require an external pullup. To minimize supply cur-rent consumption, the internal 4.7k Ωpullup resistor dis-connects from the supply whenever the MAX6316M/MAX6318MH/MAX6319MH assert reset.Open-Drain R E S E T OutputThe MAX6320P/MAX6321HP/MAX6322HP have an active-low, open-drain reset output. This output struc-ture will sink current when RESET is asserted. Connect a pullup resistor from RESET to any supply voltage up to 6V (Figure 6). Select a resistor value large enough toregister a logic low (see Electrical Characteristics ), and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k Ωpullup is sufficient in most applications.Manual-Reset InputThe MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP feature a manual reset input. A logic low on MR asserts a reset. After MR transitions low to high, reset remains asserted for the duration of the reset timeout peri-od (t RP ). The MR input is connected to V CC through an internal 52k Ωpullup resistor and therefore can be left unconnected when not in use. MR can be driven with TTL-logic levels in 5V systems, with CMOS-logic levels in 3V systems, or with open-drain or open-collector output devices. A normally-open momentary switch from MR to ground can also be used; it requires no external debouncing circuitry. MR is designed to reject fast, negative-going transients (typically 100ns pulses). A 0.1µF capacitor from MR to ground provides additional noise immunity.The MR input pin is equipped with internal ESD-protection circuitry that may become forward biased. Should MR be driven by voltages higher than V CC , excessive current would be drawn, which would damage the part. F or example, assume that MR is driven by a +5V supply other than V CC . If V CC drops lower than +4.7V, MR ’s absolute maximum rating is violated [-0.3V to (V CC + 0.3V)], and undesirable current flows through the ESD structure from MR to V CC . To avoid this, use the same supply for MR as the supply monitored by V CC . This guarantees that the voltage at MR will never exceed V CC .Watchdog InputThe MAX6316_/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP feature a watchdog circuit that monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within the watchdog timeout period (t WD ),reset asserts. The internal watchdog timer is cleared by reset or by a transition at WDI (which can detect pulses as short as 50ns). The watchdog timer remains cleared while reset is asserted. Once reset is released, the timer begins counting again (Figure 7).The WDI input is designed for a three-stated output device with a 10µA maximum leakage current and the capability of driving a maximum capacitive load of 200pF.The three-state device must be able to source and sink at least 200µA when active. Disable the watchdog function by leaving WDI unconnected or by three-stating the driver connected to WDI. When the watchdog timer is left open circuited, the timer is cleared internally at intervals equal to 7/8 of the watchdog period.Figure 6. MAX6320P/MAX6321HP/MAX6322HP Open-Drain RESET Output Allows Use with Multiple SuppliesFigure 5. Bidirectional RESET Timing DiagramM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 10______________________________________________________________________________________Applications InformationWatchdog Input CurrentThe WDI input is internally driven through a buffer and series resistor from the watchdog counter. For minimum watchdog input current (minimum overall power con-sumption), leave WDI low for the majority of the watch-dog timeout period. When high, WDI can draw as much as 160µA. Pulsing WDI high at a low duty cycle will reduce the effect of the large input current. When WDI is left unconnected, the watchdog timer is serviced within the watchdog timeout period by a low-high-low pulse from the counter chain.Negative-Going V CC TransientsThese supervisors are immune to short-duration, nega-tive-going V CC transients (glitches), which usually do not require the entire system to shut down. Typically,200ns large-amplitude pulses (from ground to V CC ) on the supply will not cause a reset. Lower amplitude puls-es result in greater immunity. Typically, a V CC transient that goes 100mV under the reset threshold and lasts less than 4µs will not trigger a reset. An optional 0.1µF bypass capacitor mounted close to V CC provides addi-tional transient immunity.Ensuring Valid Reset OutputsDown to V CC = 0The MAX6316_/MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP are guaranteed to operate properly down to V CC = 1V. In applications that require valid reset levels down to V CC = 0, a pulldown resistor to active-low outputs (push/pull and bidirectional only,F igure 8) and a pullup resistor to active-high outputs(push/pull only, Figure 9) will ensure that the reset line is valid while the reset output can no longer sink orsource current. This scheme does not work with the open-drain outputs of the MAX6320/MAX6321/MAX6322.The resistor value used is not critical, but it must be large enough not to load the reset output when V CC is above the reset threshold. F or most applications,100k Ωis adequate.Watchdog Software Considerations(MAX6316/MAX6317/MAX6318/MAX6320/MAX6321)One way to help the watchdog timer monitor software execution more closely is to set and reset the watchdog input at different points in the program, rather than pulsing the watchdog input high-low-high or low-high-low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watchdog from timing out.Figure 7. Watchdog Timing RelationshipFigure 9. Ensuring RESET Valid to V CC = 0 on Active-High Push/Pull OutputsFigure 8. Ensuring RESET Valid to V CC = 0 on Active-Low Push/Pull and Bidirectional OutputsMAX6316–MAX6322Watchdog and Manual Reset______________________________________________________________________________________11F igure 10 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the pro-gram returns to the beginning. If the program should hang in any subroutine, the problem would be quickly corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued. As described in the Watchdog Input Current section, this scheme results in higher time average WDI current than does leaving WDI low for the majority of the timeout period and periodically pulsing it low-high-low.Figure 10. Watchdog Flow Diagram__________________Pin ConfigurationsTypical Operating CircuitTable 2. Standard VersionsTable 1. Factory-Trimmed Reset ThresholdsM A X 6316–M A X 6322Watchdog and Manual ResetTable 3. Reset/Watchdog Timeout PeriodsMAX6316–MAX6322Watchdog and Manual Reset______________________________________________________________________________________13__Ordering Information (continued)a watchdog feature (see Selector Guide) are factory-trimmed to one of four watchdog timeout periods. Insert the letter corre-sponding to the desired watchdog timeout period (W, X, Y, or Z from Table 3) into the blank following the reset timeout suffix.TRANSISTOR COUNT: 191SUBSTRATE IS INTERNALLY CONNECTED TO V+Chip Informationdard versions only. The required order increment for nonstandard versions is 10,000 pieces. Contact factory for availability.M A X 6316–M A X 6322Watchdog and Manual Reset 14______________________________________________________________________________________Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)M axim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a M axim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________15©2007 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6316–MAX6322 Watchdog and Manual ResetRevision History。

MAX6323AUT23中文资料

元器件交易网
19-1838; Rev 4; 12/05
MAX6323/MAX6324
µP Supervisory Circui Manual Reset
General Description
The MAX6323/MAX6324 microprocessor (µP) supervisory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity outside an expected window of operation. Six lasertrimmed reset thresholds are available with ±2.5% accuracy from +2.32V to +4.63V. Valid RESET output is guaranteed down to VCC = +1.2V. The RESET output is either push-pull (MAX6323) or open-drain (MAX6324). RESET is asserted low when VCC falls below the reset threshold, or when the manual reset input (MR) is asserted low. RESET remains asserted for at least 100ms after VCC rises above the reset threshold and MR is deasserted.
and +5.0V Power Supplies ♦ Open-Drain or Push-Pull RESET Outputs ♦ Low-Power Operation (23µA typ) ♦ Debounced Manual Reset Input ♦ Guaranteed Reset Valid to VCC = +1.2V

MAX352中文资料

Note 2: All leads are soldered or welded to PC board.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Digital Inputs, VCOM, VNC, VNO (Note 1) ...........(V- - 2V) to (V+ + 2V) .........................................................or 30mA (whichever occurs first) Current (any terminal) .........................................................30mA Peak Current COM_, NO_, NC_
Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C

MAX8533_cn

___________________________________概述MAX8533是一款单端口、12V、InfiniBand ®兼容(IB) 的通用热插拔控制器。

该器件可应用于IB I类(非隔离型)和IB II类(隔离型) 电源拓扑应用。

此外，MAX8533能够在12V 总线供电的可热插拔刀片式服务器、RAID卡和网络交换机或路由器中充当可靠的电源控制器。

MAX8533内部集成有多种功能，允许电路板可靠地插入和拔出，同时还可实时监视异常事件。

开启输入电压时，MAX8533实现可调的软启动斜率，并提供过流保护。

该器件可在一段用户设定的时间内提供精确、稳定的电流调节输出，用于在过流情况(OC) 下完成闭锁和软启动。

此外，MAX8533还提供了第二级严重过流(SOC) 保护功能，在100ns内能够对短路故障做出响应。

MAX8533还具有可调的过压保护功能。

MAX8533具有欠压锁定(UVLO)功能，以及可连接至DC-DC转换器的电源就绪信号(POK)，以确认工作时电源输出电压的状态。

两个使能输入引脚EN (逻辑使能)和LPEN (本地电源使能) 提供灵活的上电顺序。

MAX8533可工作在扩展级温度范围，能在电路板拔出时承受最高额定值为16V的电感感生电压。

MAX8533采用节省空间的10引脚µMAX封装。

___________________________________应用12V热插拔InfiniBand电路供电热插拔/插头/坞站电源管理刀片式服务器RAID网络路由器和交换机___________________________________特性♦12V热插拔控制器，用于25W或50W InfiniBand端口♦可编程过流保护电流调节输出♦EN和LPEN输入引脚可实现灵活的上电顺序♦电源就绪信号♦可承受最高16V的电感感生电压♦开启过程中提供软启动过流保护♦定时的电流调节周期(可调)♦输出完全短路时100ns IC响应时间♦可调过压保护♦欠压锁定♦可调启动斜率MAX8533尺寸最小、高可靠性、12V、InfiniBand兼容的热插拔控制器________________________________________________________________Maxim Integrated Products 119-2849; Rev 0; 4/03本文是Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。

MAX6373中文资料

General DescriptionThe MAX6369–MAX6374 are pin-selectable watchdog timers that supervise microprocessor (µP) activity and signal when a system is operating improperly. During normal operation, the microprocessor should repeated-ly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to demonstrate that the system is processing code properly. If the µP does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watch-dog (WDO ) output to signal that the system is not exe-cuting the desired instructions within the expected time frame. The watchdog output pulse can be used to reset the µP or interrupt the system to warn of processing errors.The MAX6369–MAX6374 are flexible watchdog timer supervisors that can increase system reliability through notification of code execution errors. The family offers several pin-selectable watchdog timing options to match a wide range of system timing applications:•Watchdog startup delay: provides an initial delay before the watchdog timer is started.•Watchdog timeout period: normal operating watch-dog timeout period after the initial startup delay.•Watchdog output/timing options: open drain (100ms)or push-pull (1ms).The MAX6369–MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.________________________ApplicationsEmbedded Control Systems Industrial ControllersCritical µP and Microcontroller (µC) Monitoring AutomotiveTelecommunications NetworkingFeatureso Precision Watchdog Timer for Critical µP Applications o Pin-Selectable Watchdog Timeout Periods o Pin-Selectable Watchdog Startup Delay Periods o Ability to Change Watchdog Timing Characteristics Without Power Cycling o Open-Drain or Push-Pull Pulsed Active-Low Watchdog Output o Watchdog Timer Disable Feature o +2.5V to +5.5V Operating Voltage o 8µA Low Supply Currento No External Components Required o Miniature 8-Pin SOT23 PackageMAX6369–MAX6374Pin-Selectable Watchdog Timers19-1676; Rev 2; 2/03Ordering InformationPin Configuration appears at end of data sheet.Note:All devices are available in tape-and-reel only. Required order increment is 2,500 pieces.Selector GuideFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at1-888-629-4642, or visit Maxim’s website at .M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V= +2.5V to +5.5V, SET_ = V or GND, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C and Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Terminal Voltage (with respect to GND)V CC .....................................................................-0.3V to +6V WDI.....................................................................-0.3V to +6V WDO (Open Drain: MAX6369/71/73).................-0.3V to +6V WDO (Push-Pull: MAX6370/72/74 .......-0.3V to (V CC + 0.3V)SET0, SET1, SET2................................-0.3V to (V CC + 0.3V)Maximum Current, Any Pin (input/output)...........................20mAContinuous Power Dissipation (T A = +70°C)SOT23-8 (derate 8.75mW/°C above +70°C)...............700mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°C V CC Rise or Fall Rate......................................................0.05V/µsMAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 4_______________________________________________________________________________________461081214-4010-15356085SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )Typical Operating Characteristics(Circuit of Figure 1, T A = +25°C, unless otherwise noted .)0.9970.9990.9981.0011.0001.0021.003-4010-15356085WATCHDOG TIMEOUT PERIODvs. TEMPERATUREM A X 6369/74-02TEMPERATURE (°C)N O R M A L I Z E D W A T C H D O G T I M E O U T P E R I O DELECTRICAL CHARACTERISTICS (continued)Note 2:Guaranteed by design.Note 3:In this setting the watchdog timer is inactive and startup delay ends when WDI sees its first level transition. See SelectingDevice Timing for more information.Note 4:After power-up, or a setting change, there is an internal setup time during which WDI is ignored.MAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________5Pin DescriptionDetailed DescriptionThe MAX6369–MAX6374 are flexible watchdog circuits for monitoring µP activity. During normal operation, the internal timer is cleared each time the µP toggles the WDI with a valid logic transition (low to high or high to low) within the selected timeout period (t WD ). The WDO remains high as long as the input is strobed within the selected timeout period. If the input is not strobed before the timeout period expires, the watchdog output is asserted low for the watchdog output pulse width (t WDO ). The device type and the state of the three logic control pins (SET0, SET1, and SET2) determine watch-dog timing characteristics. The three basic timing varia-tions for the watchdog startup delay and the normalTable 1 for the timeout characteristics for all devices in the family):•Watchdog Startup Delay:Provides an initial delay before the watchdog timer is started.Allows time for the µP system to power up and initial-ize before assuming responsibility for normal watch-dog timer updates.Includes several fixed or pin-selectable startup delay options from 200µs to 60s, and an option to wait for the first watchdog input transition before starting the watchdog timer.M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 6_______________________________________________________________________________________•Watchdog Timeout Period:Normal operating watchdog timeout period after the initial startup delay.A watchdog output pulse is asserted if a valid watch-dog input transition is not received before the timeout period elapses.Eight pin-selectable timeout period options for each device, from 30µs to 60s.Pin-selectable watchdog timer disable feature.•Watchdog Output/Timing Options:Open drain, active low with 100ms minimum watch-dog output pulse (MAX6369/MAX6371/MAX6373).Push-pull, active low with 1ms minimum watchdog output pulse (MAX6370/MAX6372/MAX6374).Each device has a watchdog startup delay that is initi-ated when the supervisor is first powered or after the user modifies any of the logic control set inputs. The watchdog timer does not begin to count down until theFigure 1. Functional Diagramcompletion of the startup delay period, and no watch-dog output pulses are asserted during the startup delay. When the startup delay expires, the watchdog begins counting its normal watchdog timeout period and waiting for WDI transitions. The startup delay allows time for the µP system to power up and fully ini-tialize before assuming responsibility for the normal watchdog timer updates. Startup delay periods vary between the different devices and may be altered by the logic control set pins. To ensure that the system generates no undesired watchdog outputs, the routine watchdog input transitions should begin before the selected minimum startup delay period has expired. The normal watchdog timeout period countdown is initi-ated when the startup delay is complete. If a valid logic transition is not recognized at WDI before the watchdog timeout period has expired, the supervisor asserts a watchdog output. Watchdog timeout periods vary between the different devices and may be altered by the logic control set pins. To ensure that the system generates no undesired watchdog outputs, the watch-dog input transitions should occur before the selected minimum watchdog timeout period has expired.The startup delay and the watchdog timeout period are determined by the states of the SET0, SET1, and SET2 pins, and by the particular device within the family. For the MAX6369 and MAX6370, the startup delay is equal to the watchdog timeout period. The startup and watchdog timeout periods are pin selectable from 1ms to 60s (minimum).For the MAX6371 and MAX6372, the startup delay is fixed at 60s and the watchdog timeout period is pin selectable from 1ms to 60s (minimum).The MAX6373/MAX6374 provide two timing variations for the startup delay and normal watchdog timeout. Five of the pin-selectable modes provide startup delays from 200µs to 60s minimum, and watchdog timeout delays from 3ms to 10s minimum. Two of the selectable modes do not initiate the watchdog timer until the device receives its first valid watchdog input transition (there is no fixed period by which the first input must be received). These two extended startup delay modesare useful for applications requiring more than 60s for system initialization.All the MAX6369–MAX6374 devices may be disabledwith the proper logic control pin setting (Table 1).Applications InformationInput Signal Considerations Watchdog timing is measured from the last WDI risingor falling edge associated with a pulse of at least 100nsin width. WDI transitions are ignored when WDO is asserted, and during the startup delay period (Figure2). Watchdog input transitions are also ignored for asetup period, t SETUP, of up to 300µs after power-up ora setting change (Figure 3).Selecting Device TimingSET2, SET1, and SET0 program the startup delay and watchdog timeout periods (Table 1). Timeout settingscan be hard wired, or they can be controlled with logicgates and modified during operation. To ensure smooth transitions, the system should strobe WDI immediately before the timing settings are changed. This minimizesthe risk of initializing a setting change too late in thetimer countdown period and generating undesired watchdog outputs. After changing the timing settings,two outcomes are possible based on WDO. If the change is made while WDO is asserted, the previous setting is allowed to finish, the characteristics of thenew setting are assumed, and the new startup phase is entered after a 300µs setup time (t SETUP) elapses. Ifthe change is made while WDO is not asserted, thenew setting is initiated immediately, and the new start-up phase is entered after the 300µs setup time elapses.MAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________7 Figure 3. Setting Change TimingM A X 6369–M A X 6374Pin-Selectable Watchdog TimersSelecting 011 (SET2 = 0, SET1 = 1, SET0 = 1) disables the watchdog timer function on all devices in the family.Operation can be reenabled without powering down by changing the set inputs to the new desired setting. The device assumes the new selected timing characteris-tics and enter the startup phase after the 300µs setup time elapses (Figure 3).The MAX6373/MAX6374 offer a first-edge feature. In first-edge mode (settings 101 or 110, Table 1), the internal timer does not control the startup delay period.Instead, startup terminates when WDI sees a transition.If changing to first-edge mode while the device is oper-ating, disable mode must be entered first. It is then safe to select first-edge mode. Entering disable mode first ensures the output is unasserted when selecting first-edge mode and removes the danger of WDI being masked out.OutputThe MAX6369/MAX6371/MAX6373 have an active-low,open-drain output that provides a watchdog output pulse of 100ms. This output structure sinks current when WDO is asserted. Connect a pullup resistor from WDO to any supply voltage up to +5.5V.Select a resistor value large enough to register a logic low (see Electrical Characteristics ), and small enoughto register a logic high while supplying all input current and leakage paths connected to the WDO line. A 10k Ωpullup is sufficient in most applications. The MAX6370/MAX6372/MAX6374 have push-pull outputs that pro-vide an active-low watchdog output pulse of 1ms.When WDO deasserts, timing begins again at the beginning of the watchdog timeout period (Figure 2).Usage in Noisy EnvironmentsIf using the watchdog timer in an electrically noisy envi-ronment, a bypass capacitor of 0.1µF should be con-nected between V CC and GND as close to the device as possible, and no further away than 0.2 inches.________________Watchdog SoftwareConsiderationsTo help the watchdog timer monitor software execution more closely, set and reset the watchdog input at differ-ent points in the program, rather than pulsing the watch-dog input high-low-high or low-high-low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watch-dog from timing out. Figure 4 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the program returns to the beginning. If the pro-gram should hang in any subroutine, the problem would be quickly corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, causing WDO to pulse.Figure 4. Watchdog Flow DiagramChip InformationTRANSISTOR COUNT: 1500PROCESS: BiCMOSPin ConfigurationMaxim cannot assume responsibility f or use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2003 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.。

JT631xA 系列可编程直流电子负载用户使用手册说明书

JT631xA系列可编程直流电子负载用户使用手册适用型号JT6310A/JT6311A/JT6312A/ JT6313A/JT6314A/JT6315A版本号：V2.8南京嘉拓电子有限公司版权所有第一章：简介 (1)1.1.主要特点： (1)第二章：技术规格 (2)2.1.主要技术规格 (2)2.2.安装尺寸 (4)2.3.补充特性 (4)第三章：快速入门 (5)3.1.前后面板介绍 (5)3.2.开机前的准备 (5)3.3.开机自检 (6)3.4.状态栏显示字符说明 (6)3.5.设定栏显示字符说明 (6)3.6.测量项显示字符说明 (6)3.7.按键说明 (7)3.8.接口定义电气说明 (7)3.9.主菜单操作说明 (8)第四章：面板操作 (14)4.1.系统设置（System Set） (14)4.1.1.负载可操作范围 (14)4.1.2.电压电流档位选择 (14)4.1.3.保护电流设置 (14)4.1.4.保护功率设置 (14)4.1.5.电流变化斜率设置 (14)4.1.6.V on/V off设置 (14)4.1.7.被测源类型设置 (15)4.2.输入控制 (15)4.2.1.输入开关操作(On/Off) (15)4.2.2.短路操作(Short) (15)4.3.触发操作（Trigger） (15)4.4.基本操作模式 (15)4.4.1.定电流模式（CC） (15)4.4.2.定电压模式（CV） (15)4.4.3.定功率模式（CP） (16)4.4.4.定电阻模式（CR） (16)4.5.LED模式 (16)4.6.动态操作模式（DYNA） (16)4.7.可编程序列操作模式(List) (17)4.8.测量项 (18)4.8.1.电压平均值（V）、电流平均值（I）测量 (18)4.8.2.电压纹波（V PP）、电流纹波（I PP）测量 (18)4.8.3.电压峰值（V P+/V P-）、电流峰值（I P+/I P-）测量 (18)4.9.静态综合测试模式（S-Test) (19)4.9.1.过流保护测试（OCP) (19)4.9.2.负载效应测试（Load Effect） (19)4.10.瞬态综合测试模式（T-Test） (20)4.10.1.动态变频扫描（Sweep） (20)4.10.2.时间量测（Timing） (20)4.10.3.过电压保护测试（OVP） (21)4.11.自动测试模式（A-Test） (21)4.12.电池电量测试模式(Battery) (22)4.13.同步主从式并机时序控制 (22)4.14.远端补偿 (24)4.15.保护功能 (24)4.15.1.过压保护 (24)4.15.2.过流保护 (24)4.15.3.过功率保护 (24)4.15.4.过热保护 (24)4.15.5.输入极性反接保护 (24)4.16.存取操作 (24)4.17.调节旋钮的使用 (24)4.18.个性化显示设置 (25)第五章：通信协议(SCPI) (26)5.1.SCPI命令概述 (26)5.2.寄存器说明 (26)5.3.共同命令 (27)5.4.必备命令 (29)5.4.1.系统命令 (29)5.4.2.状态命令 (29)5.5.输入设置命令 (30)5.5.1.输入控制 (30)5.5.2.系统参数设定 (30)5.5.3.工作模式控制 (32)5.5.4.工作参数设定 (32)5.5.5.LIST命令 (35)5.6.测量命令 (36)5.7.OCP测试命令 (37)5.8.OVP测试命令 (38)5.9.Timing测试命令 (39)5.10.Peak 测试命令 (40)5.11.CAPacity 命令 (41)5.12.TWaveform 瞬态波形攫取命令 (41)5.13.Waveform 波形触发攫取命令 (42)5.14.Port 端口设置命令 (43)第一章：简介JT631xA系列电子负载，借助500KHz高速同步采样及DSP技术，全面加强瞬态测试以及多方位的智能分析，并全面整合到自动测试功能，特别适用于电源及相关行业的量产与来料检测；而可编程电流上升率、高速动态带载及可编程序列功能，亦可以满足大部分的研发需要；特有的同步主从式并机时序，则可以满足多路输出电源的同步带载需要，及单路输出电源的功率扩展需要。

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General DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply. Ideal for monitoring both 5V and 3.3V in personal computer systems, these devices assert a system reset if any of the monitored supplies falls outside the programmed threshold. Low supply current (15µA) and a small package suit them for portable applications. The MAX6305–MAX6313 are specifically designed to ignore fast transients on any monitored supply.These devices are available in a SOT23-5 package,have factory-programmed reset thresholds from 2.5V to 5.0V (in 100mV increments), and feature four power-on reset timeout periods. Ten standard versions are avail-able. Contact the factory for availability of non standard versions.ApplicationsPortable Computers Computers ControllersIntelligent InstrumentsPortable/Battery-Powered Equipment Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V Embedded Control SystemsFeatureso Small 5-Pin SOT23 Packageo Precision Factory-Set V CC Reset Thresholds;Available in 0.1V Increments from 2.5V to 5V o Immune to Short V CC Transientso Guaranteed RESET Valid to V CC = 1V o Guaranteed Over Temperature o 8µA Supply Currento Factory-Set Reset Timeout Delay from 1ms (min) to 1120ms (min)o No External Components o Manual Reset Inputo Under/Overvoltage Supply MonitoringMAX6305–MAX63135-Pin, Multiple-Input,Programmable Reset ICs________________________________________________________________Maxim Integrated Products119-1145; Rev 5; 4/08†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for availability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Pin Configurations and Typical Operating Circuit appear atend of data sheet.Ordering Information continued at end of data sheet.Standard Versions Table appears at end of data sheet._______________________________________________________________Selector TableFor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSV CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC ...........................................................................-0.3V to +6V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input/Output Current, All Pins.............................................20mA Rate of Rise, V CC ............................................................100V/µs Continuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C).................571mWOperating Temperature RangeMAX63_ _UK _ _D_-T.........................................0°C to +70°C MAX63_ _EUK _ _D_-T...................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)V CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/Note 2: The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < V CC < 2.5V.Note 3: The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 monitor V CC through an internal factory-trimmed voltagedivider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately 100mV increments from 2.5V to 5V (Table 1).Note 4:Guaranteed by design.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +5V, T A = +25°C, unless otherwise noted.)5.05.56.06.57.07.58.08.59.09.5-60-40-2020406080100SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )01020304050607080-60-40-2020406080100V CC FALLING PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )010203040506070-60-40-20020406080100OVRST IN RISING PROPAGATION DELAY vs. TEMPERATURE (OVERVOLTAGE RESET INPUT)TEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )020406080100120-60-40-2020406080100RST IN_ FALLING PROPAGATION DELAY vs. TEMPERATURETEMPERATURE (°C)R S T I N _ P R O P A G A T I O N D E L A Y (n s )104001200800MAXIMUM TRANSIENT DURATION vs.VCC RESET THRESHOLD OVERDRIVE10OVERDRIVE, V TH - V CC (mV)T R A N S I E N T D U R A T I O N (μs )100100010,0000.900.920.940.960.981.001.021.041.061.081.10-60-40-20020406080100RESET TIMEOUT vs. TEMPERATURE6305 T O C 05TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T0.9900.9920.9940.9960.9981.0001.0021.0041.0061.0081.010-60-40-2020406080100RESET THRESHOLD vs. TEMPERATURE6305 T O C 06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D (V /V )104001200800MAXIMUM TRANSIENT DURATION vs.OVRST IN THRESHOLD OVERDRIVE10OVERDRIVE, V OVRST IN - V REF (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000104001200800MAXIMUM TRANSIENT DURATION vs.RST IN_ THRESHOLD OVERDRIVE10OVERDRIVE, V REF - V RST IN (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000_______________Detailed DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply and issue a system reset when any monitored supply falls out of regulation. The MAX6305/MAX6308/MAX6311 have two adjustable undervoltage reset inputs (RST IN1 and RST IN2). The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-itor V CC through an internal, factory-trimmed voltage divider. The MAX6306/MAX6309/MAX6312 have, in addition, an adjustable undervoltage reset input and a manual-reset input. The internal voltage divider sets the reset threshold as specified in the device part number (Table 1). The MAX6307/MAX6310/ MAX6313 feature an adjustable undervoltage reset input (RST IN) and an adjustable overvoltage reset input (OVRST IN) in addition to the factory-trimmed reset threshold on the V CC moni-tor. Program the adjustable reset inputs with an external resistor divider (see Adjustable Reset Inputs section).Reset OutputsA µP’s reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions.RESET (MAX6305–MAX6310) and RESET (MAX6311/MAX6312/MAX6313) are guaranteed to be asserted at a valid logic level for V CC > 1V (see Electrical Characteristics ). Once all monitored voltages exceed their programmed reset thresholds, an internal timer keeps reset asserted for the reset timeout period (t RP );after this interval, reset deasserts.If a brownout condition occurs (any or all monitored volt-ages dip outside their programmed reset threshold),reset asserts (RESET goes high; RESET goes low). Any time any of the monitored voltages dip below their reset threshold, the internal timer resets to zero and reset asserts. The internal timer starts when all of the moni-tored voltages return above their reset thresholds, and reset remains asserted for a reset timeout period. The MAX6305/MAX6306/MAX6307 feature an active-low,MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________5______________________________________________________________Pin DescriptionM A X 6305–M A X 6313open-drain, N-channel output. The MAX6308/MAX6309/MAX6310 feature an active-low, complementary output structure that both sinks and sources current, and the MAX6311/MAX6312/MAX6313 have an active-high com-plementary reset output.The MAX6305/MAX6308/MAX6311 switch from under-voltage lockout operation to normal operation between 1.5V < V CC < 2.5V. Below 1.5V, V CC undervoltage-lockout mode asserts RESET . Above 2.5V, V CC normal-operation mode asserts reset if RST IN_ falls below the RST IN_ threshold.Manual-Reset Input(MAX6306/MAX6309/MAX6312)Many µP-based products require manual-reset capability,allowing an operator or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for a reset active timeout period (t RP ) after MR returns high. This input has an inter-nal 63.5k Ωpull-up resistor, so it can be left open if it is not used. MR can be driven with TTL-logic levels in 5V sys-tems, with CMOS-logic levels in 3V systems, or with open-drain/collector output devices. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required.If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.The MR pin has internal ESD-protection circuitry that may be forward biased under certain conditions, drawing excessive current. For example, assume the circuitry driv-ing MR uses a +5V supply other than V CC . If V CC drops or browns out lower than +4.7V, MR ’s absolute maximum rat-ing is violated (-0.3V to (V CC + 0.3V)), and undesirable current flows through the ESD structure from MR to V CC .To avoid this, it is recommended that the supply for the MR pin be the same as the supply monitored by V CC . In this way, the voltage at MR will not exceed V CC .Adjustable Reset InputsThe MAX6305–MAX6313 each have one or more reset inputs (RST IN_ /OVRST IN). These inputs are com-pared to the internal reference voltage (F igure 1).Connect a resistor voltage divider to RST IN_ such that V RST IN_falls below V RSTH (1.23V) when the monitored voltage (V IN ) falls below the desired reset threshold (V TH ) (F igure 2). Calculate the desired reset voltage with the following formula:R1 + R2V TH = ________x VRSTHR25-Pin, Multiple-Input, Programmable Reset ICs 6_______________________________________________________________________________________Figure 1. Functional DiagramMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________7The ±25nA max input leakage current allows resistors on the order of megohms. Choose the pull-up resistor in the divider to minimize the error due to the input leakage cur-rent. The error term in the calculated threshold is simply:±25nA x R1If you choose R1 to be 1M Ω, the resulting error is ±25 x 10-9x 1 x 106= ±25mV.Like the V CC voltage monitors on the MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_inputs (when used with a voltage divider) are designed to ignore fast voltage transients. Increase the noise immunity by connecting a capacitor on the order of 0.1µF between RST IN and GND (Figure 2). This creates a single-pole lowpass filter with a corner frequency given by:f = (1/2π) / (R1 + R2)(R1 x R2 x C)For example, if R1 = 1M Ωand R2 = 1.6M Ω, adding a 0.1µF capacitor from RST IN_ to ground results in a lowpass corner frequency of f = 2.59Hz. Note that adding capacitance to RST IN slows the circuit’s overall response time.__________Applications InformationInterfacing to µPs with Bidirectional Reset PinsSince the RESET output on the MAX6305/MAX6306/MAX6307 is open drain, these devices interface easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcontroller’s RESET pin with a single pull-up resistor allows either device to assert reset (Figure 3).Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going V CC transients (glitches).The Typical Operating Characteristics show the Maximum Transient Duration vs. V CC Reset Threshold Overdrive, for which reset pulses are not generated.The graph was produced using negative-going pulses,starting at V TH max, and ending below the pro-grammed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maxi-mum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e.,goes farther below the reset threshold), the maximum allowable pulse width decreases.RST IN_/OVRST IN are also immune to negative/positive-going transients (see Typical Operating Characteristics ).A 0.1µF bypass capacitor mounted close to the RST IN_,OVRST IN, and/or the V CC pin provides additional tran-sient immunity.Ensuring a Valid RESET /RESETOutput Down to V CC = 0VWhen V CC falls below 1V, push/pull structured RESET /RESET current sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applica-tions, since most µPs and other circuitry do not operate with V CC below 1V. In those applications where RESET must be valid down to 0V, adding a pull-down resistor between RESET and ground sinks any stray leakageFigure 2. Increasing Noise ImmunityFigure 3. Interfacing to µPs with Bidirectional Reset I/Ocurrents, holding RESET low (Figure 4). The pull-down resistor’s value is not critical; 100k Ωis large enough not to load RESET and small enough to pull RESET to ground. For applications where RESET must be valid to V CC , a 100k Ωpull-up resistor between RESET and V CC will hold RESET high when V CC falls below 1V (Figure 5).Since the MAX6305/MAX6306/MAX6307 have open-drain, active-low outputs, they typically use a pull-up resistor. With these devices and under these conditions (V CC < 1V), RESET will most likely not maintain an active condition, but will drift toward a nonactive level due to the pull-up resistor and the RESET output’s reduction in sinking capability. These devices are not recommended for applications that require a valid RESET output below 1V.* Factory-trimmed reset thresholds are available in approximately 100mV increments with a ±1.5% room-temperature variance.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 8_______________________________________________________________________________________Figure 4. Ensuring RESET Valid to V CC = 0VFigure 5. Ensuring RESET Valid to V CC = 0VTable 1. Factory-Trimmed Reset Thresholds*MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________9Chip InformationTRANSISTOR COUNT: 800Typical Operating Circuit†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for avail-ability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 10______________________________________________________________________________________Pin ConfigurationsPackage InformationFor the latest package outline information, go to /packages .Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________11©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6305–MAX6313 5-Pin, Multiple-Input, Programmable Reset ICs元器件交易网。