Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220
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1 19-128; Rev 2; 11/99 Low-Cost, +2.7 to +5.5, Micropower General Description The low-cost, fully integrated temperature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. Operating from a +2.7 to +5.5 supply, these devices feature two on-chip, temperature-dependent voltage references and a comparator. They are available with factory-trimmed temperature trip thresholds from -45 C to +115 C in 1 C increments, and are accurate to ±.5 C (typ) or ±6 C (max). These devices require no external components and typically consume 3µA supply current. Hysteresis is pin-selectable at +2 C or +1 C. The / have an active-low, open-drain output intended to interface with a microprocessor (µp) reset input. The / have an activehigh, push-pull output intended to directly drive fancontrol logic. The / are offered with hot-temperature thresholds (+35 C to +115 C), asserting when the temperature is above the threshold. The / are offered with cold-temperature thresholds (-45 C to +15 C), asserting when the temperature is below the threshold. The are offered in eight standard temperature versions; contact the factory for pricing and availability of nonstandard temperature versions. They are available in 5-pin SOT23 and 7-pin TO-22 packages. Typical Operating Circuit +2.7 TO +5.5 INT µp Features ±.5 C (typical) Threshold Accuracy Over Full Temperature Range No External Components Required Low Cost 3µA Supply Current Factory-Programmed Thresholds from -45 C to +115 C in 1 C Increments Open-Drain Output (/) Push-Pull Output (/) Pin-Selectable +2 C or +1 C Hysteresis SOT23-5 and TO22-7 Packages Ordering Information PART* TEMP. RANGE PIN-PACKAGE UK -T -55 C to +125 C 5 SOT23-5 CM -T -55 C to +125 C 7 TO-22-7 UK -T -55 C to +125 C 5 SOT23-5 CM -T -55 C to +125 C 7 TO-22-7 UK -T -55 C to +125 C 5 SOT23-5 CM -T -55 C to +125 C 7 TO-22-7 UK -T -55 C to +125 C 5 SOT23-5 CM -T -55 C to +125 C 7 TO-22-7 *These parts are offered in eight standard temperature versions with a minimum order of 2,5 pieces. To complete the suffix information, add P or N for positive or negative trip temperature, and select an available trip point in degrees centigrade. For example, the UKP65-T describes a in a SOT23-5 package with a +65 C threshold. Contact the factory for pricing and availability of nonstandard temperature versions (minimum order 1, pieces). Applications µp Temperature Monitoring in High-Speed Computers Temperature Control Selector Guide and Pin Configurations appear at end of data sheet. Temperature Alarms Fan Control Patents Pending Maxim Integrated Products 1 For free samples & the latest literature: or phone For small orders, phone
2 Low-Cost, +2.7 to +5.5, Micropower ABSOLUTE MAXIMUM RATINGS Supply oltage ( ) to +7 () to +7 () to ( +.3) () to +7 () to ( +.3) All Other Pins to ( +.3) Input Current (all pins)...2ma 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. ELECTRICAL CHARACTERISTICS Output Current (all pins)...2ma Continuous Power Dissipation (T A = +7 C) 5-Pin SOT23-5 (derate 7.1mW/ C above +7 C)...571mW Operating Temperature Range C to +125 C Storage Temperature Range C to +165 C Lead Temperature (soldering, 1sec)...+3 C ( = +2.7 to +5.5, R PULL-UP = 1kΩ (/ only), T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER Supply oltage Range Supply Current Temperature Threshold Accuracy (Note 2) Temperature Threshold Hysteresis Input Threshold (Note 3) Output oltage High Output oltage Low Open-Drain Output Leakage Current SYMBOL I CC T TH T IH IL OH OL CONDITIONS MIN TYP MAX C to -25 C -6 ± C to +15 C -4 ± C to +65 C -4 ± C to +115 C -6 ±.5 6 = 2 = 1.8 x.2 x I SOURCE = 5µA, > 2.7 (/ only).8 x I SOURCE = 8µA, > 4.5 (/ only) I SINK = 1.2mA, > 2.7 I SINK = 3.2mA, > 4.5 = 2.7, = 5.5 (), = 5.5 () UNITS µa C C na Note 1: 1% production tested at T A = +25 C. Specifications over temperature limits are guaranteed by design. Note 2: The are available with internal, factory-programmed temperature trip thresholds from -45 C to +115 C in +1 C increments (see Selector Guide). Note 3: Guaranteed by design. 2
3 Low-Cost, +2.7 to +5.5, Micropower PERCENTAGE OF PARTS SAMPLED (%) Typical Operating Characteristics ( = +5, R PULL-UP = 1kΩ (/), T A = +25 C, unless otherwise noted.) TRIP THRESHOLD ACCURACY SAMPLE SIZE = ACCURACY ( C) TOC-A SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( C) TOC1 OUTPUT SOURCE RESISTANCE (Ω) / OUTPUT SOURCE RESISTANCE vs. TEMPERATURE = 2.7 = 3.3 = TEMPERATURE ( C) TOC2 OUTPUT SINK RESISTANCE (Ω) OUTPUT SINK RESISTANCE vs. TEMPERATURE = 2.7 = 3.3 = 5. TOC3 +15 C/div SOT23 THERMAL STEP RESPONSE IN PERFLUORINATED FLUID TOC4 MOUNTED ON.75in 2 OF 2 oz. COPPER +1 C +25 C C/div SOT23 THERMAL STEP RESPONSE IN STILL AIR TOC5 MOUNTED ON.75in 2 OF 2 oz. COPPER +1 C +25 C TEMPERATURE ( C) 5sec/div 2sec/div ERESIS ( C) = ERESIS vs. TRIP TEMPERATURE = = = TOC8 START-UP AND POWER-DOWN (T < T TH ) TOC7 A B START-UP DELAY (T > T TH ) TOC7A A B TRIP TEMPERATURE ( C) TRACE A: OLTAGE, R PULL-UP = 1kΩ TRACE B: PULSE DRIEN FROM 3.3 CMOS LOGIC OUTPUT TRACE A: OLTAGE, R PULL-UP = 1kΩ TRACE B: PULSE DRIEN FROM 3.3 CMOS LOGIC OUTPUT 3
4 Low-Cost, +2.7 to +5.5, Micropower 1, 2 1, PIN 1, 2 1, Supply Input (+2.7 to +5.5) 5 5 NAME 5 FUNCTION Pin Description Ground. Not internally connected. Tie both ground pins together close to the chip. Pin 2 provides the lowest thermal resistance to the die. Hysteresis Input. Connect to for +2 C hysteresis, or connect to for +1 C hysteresis. Open-Drain, Active-Low Output. goes low when the die temperature exceeds the factory-programmed temperature threshold. Connect to a 1kΩ pull-up resistor. May be pulled up to a voltage higher than. Push-Pull Active-High Output. goes high when the die temperature exceeds the factory-programmed temperature threshold. Open-Drain, Active-Low Output. goes low when the die temperature goes below the factory-programmed temperature threshold. Connect to a 1kΩ pull-up resistor. May be pulled up to a voltage higher than. 5 Push-Pull Active-High Output. goes high when the die temperature falls below the factory-programmed temperature threshold. General Description The fully integrated temperature switches incorporate two temperature-dependent references and a comparator. One reference exhibits a positive temperature coefficient and the other a negative temperature coefficient (Figure 1). The temperature at which the two reference voltages are equal determines the temperature trip point. Pin-selectable +2 C or +1 C hysteresis keeps the output from oscillating when the die temperature approaches the threshold temperature. The / have an activelow, open-drain output structure that can only sink current. The / have an active-high, push-pull output structure that can sink or source current. The internal power-on reset circuit guarantees the output is at T TH = +25 C state at start-up for 5µs. The are available with factorypreset temperature thresholds from -45 C to +115 C in 1 C increments. Table 1 lists the available temperature threshold ranges. The / outputs are intended to interface with a microprocessor (µp) reset input (Figure 2). The / outputs are intended for applications such as driving a fan control (Figure 3). Table 1. Factory-Programmed Threshold Range PART THRESHOLD (T TH ) RANGE +35 C < T TH < +115 C +35 C < T TH < +115 C -45 C < T TH < +15 C -45 C < T TH < +15 C Hysteresis Input The pin is a CMOS-compatible input that selects hysteresis at either a high level (+1 C for = ) or a low level (+2 C for = ). Hysteresis prevents the output from oscillating when the temperature approaches the trip point. The pin should not float. Drive close to ground or. Other input voltages cause increased supply current. The actual amount of hysteresis depends on the part s programmed trip threshold. (See the Typical Operating Characteristics graphs.) 4
5 Low-Cost, +2.7 to +5.5, Micropower POSITIE POSITIE NEGATIE NETWORK COLD +25 C T TH WITH 1kΩ PULL-UP HOT TEMP NEGATIE NETWORK COLD +25 C T TH HOT TEMP WITH 1kΩ PULL-UP POSITIE NEGATIE NETWORK COLD T TH +25 C HOT TEMP POSITIE NEGATIE NETWORK COLD T TH +25 C HOT TEMP Figure 1. Block and Functional Diagrams 5
6 Low-Cost, +2.7 to +5.5, Micropower +3.3 µp INT SHUTDOWN OR RESET R PULL-UP 1k HEAT Figure 2. Microprocessor Alarm/Reset Applications Information Thermal Considerations The supply current is typically 3µA. When used to drive high-impedance loads, the devices dissipate negligible power. Therefore, the die temperature is essentially the same as the package temperature. The key to accurate temperature monitoring is good thermal contact between the package and the device being monitored. In some applications, the SOT23-5 package may be small enough to fit underneath a socketed µp, allowing the device to monitor the µp s temperature directly. The TO-22 package can monitor the temperature of a heat sink directly, and presents the lower thermal resistance of the two packages. Use the monitor s output to reset the µp, assert an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the die. Heat flows in and out of plastic packages, primarily through the leads. Pin 2 of the SOT23-5 package provides the lowest thermal resistance to the die. 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 θ JA where P DISSIPATION is the power dissipated by the, and θ JA is the package s thermal resistance. The typical thermal resistance is 14 C/W for the SOT23-5 package and 75 C/W for the TO-22 package. To limit the effects of self-heating, minimize the output currents. For example, if the or sink 1mA, the output voltage is guaranteed to be less than.3. Therefore, an additional.3mw of +5 µp HEAT FAN Figure 3. Overtemperature Fan Control power is dissipated within the IC. This corresponds to a.42 C shift in the die temperature in the SOT23-5. Temperature-Window Alarm The temperature switch outputs assert when the die temperature is outside the factoryprogrammed range. Combining the outputs of two devices creates an over/undertemperature alarm. The / and the / are designed to form two complementary pairs, each containing one cold trip-point output and one hot trip-point output. The assertion of either output alerts the system to an out-of-range temperature. The / push/pull output stages can be ORed to produce a thermal out-of-range alarm. More favorably, a / can be directly wire-ored with a single external resistor to accomplish the same task (Figure 4). The temperature window alarms shown in Figure 4 can be used to accurately determine when a device s temperature falls out of the -5 C to +75 C range. The thermal-overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperaturedependent function. Low-Cost, Fail-Safe Temperature Monitor In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level integration and low cost of the facilitate the use of multiple temperature monitors to increase system reliability. Figure 5 s application uses two s with different temperature thresholds to ensure that fault conditions that can overheat the monitored device cause no permanent damage. The first temperature monitor activates the fan when the die temperature exceeds +45 C. The second triggers a system shutdown if the die temperature reaches +75 C. The second temperature monitor s output asserts when a wide variety of destructive fault conditions occur, including latchups, short circuits, and cooling-system failures. 6
7 Low-Cost, +2.7 to +5.5, Micropower +5 P75 N5 +5 OERTEMP UNDERTEMP R PULL-UP 1k OUT OF RANGE OUT OF RANGE µp HEAT HEAT +5 P75 P45 TEMPERATURE FAULT FAN CONTROL Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature Monitor P75 N5 Figure 4. Temperature-Window Alarms Table 2. Device Marking Codes for SOT23-5 Package DEICE CODE MINIMUM ORDER UKP35 ABZF UKP45 ABZR UKP55 ACFW UKP65 ABZS UKP75 ACF UKP85 ACDP UKP95 ABZT UKP15 ACFU UKP115 ACAG UKP35 ABZG UKP45 ABZU UKP55 ACGC UKP65 ABZ UKP75 ACGB UKP85 ACGA UKP95 ABZW DEICE CODE MINIMUM ORDER UKP15 ACFZ UKP115 ACFY UKN45 ADIZ UKN35 ACAQ UKN25 ACAP UKN15 ACFX UKN5 ACAN UKP5 ABZX UKP15 ACAM UKN45 ACAX UKN35 ACAW UKN25 ACA UKN15 ACGD UKN5 ACAT UKP5 ABZY UKP15 ADKE 7
8 Low-Cost, +2.7 to +5.5, Micropower PART OUTPUT STAGE TRIP TEMP THRESHOLD STANDARD TEMPERATURE THRESHOLDS ( C) Open- Drain Push-Pull Open- Drain Push-Pull Hot Hot Cold Cold Selector Guide 1 5 () SOT23-5 TO-22-7 Pin Configurations TOP IEW 1 5 () SOT23-5 TO () () ( ) ARE FOR. ( ) ARE FOR. TRANSISTOR COUNT: 237 SUBSTRATE CONNECTED TO Chip Information 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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19-1444; Rev 1; 7/99 +3 to +5.5, 1.5Mbps General Description The MAX318MAX3183 are single RS-232 receivers in a SOT23-5 package for space- and cost-cotrained applicatio requiring minimal RS-232 communicatio.
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19-1791; Rev ; 1/ Micropower Adjustable Overvoltage General Description The MAX187/MAX188 monitor up to five supply rails for an overvoltage condition and provide a latched output when any one of the five
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EVALUATION KIT AVAILABLE MAX587 45V, 4mA, Low-Quiescent-Current General Description The MAX587 high-voltage linear regulator operates from an input voltage of 6.5V to 45V and delivers up to 4mA of output
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General Description The MAX16132 MAX16135 are low-voltage, ±1% accurate, single, dual, triple, and quad-volt age μp supervisors that monitor up to 4 system-supply voltages for undervoltage and overvoltage
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General Description The MAX811/MAX81 are low-power microprocessor (µp) supervisory circuits used to monitor power supplies in µp and digital systems. They provide excellent circuit reliability and low
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19-1818; Rev 1; 1/1 Dual, Low-Noise, Low-Dropout, 16mA Linear General Description The dual, low-noise, low-dropout linear regulators operate from a +2.5V to +6.5V input and deliver up to 16mA each of continuous
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General Description The / microprocessor (μp) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in μp systems. These
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19-267; Rev ; 7/1 Low-Dropout, Constant-Current General Description The low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white
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Click here for production status of specific part numbers. MAX1652/MAX1653 General Description The MAX1652/MAX1653 are a family of small, low-power, high-voltage monitoring circuits with sequencing capability.
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19-119; Rev 0; 9/96 High-Speed, 3/, Rail-to-Rail, General Description The are high-speed, single/dual comparators with internal hysteresis. These devices are optimized for single +3 or + operation. The
More informationPA RT MAX3408EUK 100Ω 120Ω. Maxim Integrated Products 1
19-2141; Rev ; 8/1 75Ω/Ω/Ω Switchable Termination General Description The MAX346/MAX347/MAX348 are general-purpose line-terminating networks designed to change the termination value of a line, depending
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19-3664; Rev ; 4/5 Low-Input-Voltage, 5mA LDO Regulator General Description The low-dropout linear regulator operates from a +1.62V to +3.6V supply and delivers a guaranteed 5mA continuous load current
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9-; Rev 2; 6/97, Low-Dropout, General Description The / precision 2. and 4.96 micropower voltage references consume a maximum of only and operate from supply voltages up to. The combination of ultra-low
More informationLow-Cost Microprocessor Supervisory Circuits with Battery Backup
19-0130; Rev 2; 11/05 Low-Cost Microprocessor Supervisory General Description The microprocessor (µp) supervisory circuits reduce the complexity and number of components required for power-supply monitoring
More informationECL/PECL Dual Differential 2:1 Multiplexer
19-2484; Rev 0; 7/02 ECL/PECL Dual Differential 2:1 Multiplexer General Description The fully differential dual 2:1 multiplexer (mux) features extremely low propagation delay (560ps max) and output-to-output
More informationnanopower, Tiny Supervisor with Manual Reset Input
General Description The MAX16140 is an ultra-low-current, single-channel supervisory IC in a tiny, 4-bump, wafer-level package (WLP). The MAX16140 monitors the V CC voltage from 1.7V to 4.85V in 50mV increments
More informationLow-Cost, Precision, High-Side Current-Sense Amplifier MAX4172. Features
19-1184; Rev 0; 12/96 Low-Cost, Precision, High-Side General Description The is a low-cost, precision, high-side currentsense amplifier for portable PCs, telephones, and other systems where battery/dc
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a FEATURES Low Dropout: 50 mv @ 200 ma Low Dropout: 300 mv @ 300 ma Low Power CMOS: 7 A Quiescent Current Shutdown Mode: 0.2 A Quiescent Current 300 ma Output Current Guaranteed Pin Compatible with MAX667
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19-2041; Rev 1; 8/01 oltage Detectors in 4-Bump (2 X 2) General Description The is a family of ultra-low power circuits used for monitoring battery, power-supply, and regulated system voltages. Each detector
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19-1654; Rev 3; 1/12 Low-Dropout, Low I Q, 1A Linear Regulator General Description The low-dropout linear regulator (LDO) operates from +2.5 to +5.5 and delivers a guaranteed 1A load current with a low
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More informationRT9807. Micro-Power Voltage Detector with Manual Reset. General Description. Features. Applications. Pin Configurations. Ordering Information RT9807-
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9-600; Rev ; 6/00 General Description The is a buck/boost regulating charge pump that generates a regulated output voltage from a single lithium-ion (Li+) cell, or two or three NiMH or alkaline cells for
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19-094; Rev 0; /97 -in-1 Silicon Delay Line General Description The contai three independent, monolithic, logic-buffered delay lines with delays ranging from 10 to 200. Nominal accuracy is ±2 for a 10
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19-; Rev 2; 12/96 Precision, High-Side General Description The / are complete, bidirectional, highside current-sense amplifiers for portable PCs, telephones, and other systems where battery/dc power-line
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General Description The MAX6700/MAX6710 precision triple/quad voltage microprocessor (μp) supervisory circuits monitor up to four system-supply voltages and assert a single reset if any supply voltage
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19-9; Rev ; 7/ +V Precision Voltage Reference General Description The is a precision voltage reference that is pretrimmed to within ±.1% of V. The reference features excellent temperature stability (as
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General Description The MAX6895 MAX6899 is a family of small, lowpower, voltage-monitoring circuits with sequencing capability. These miniature devices offer tremendous flexibility with an adjustable threshold
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