Rainbow Electronics MAX6504 User Manual

________________General Description

The MAX6501–MAX6504 low-cost, fully integrated temperature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. Operating from a +2.7V to +5.5V 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 10°C increments, and are accurate to ±0.5°C (typ) or ±6°C (max). These devices require no external components and typically consume 30µA supply current. Hysteresis is pin-selectable at +2°C or +10°C.

The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (µP) reset input. The MAX6502/MAX6504 have an activehigh, push-pull output intended to directly drive fancontrol logic. The MAX6501/MAX6502 are offered with hot-temperature thresholds (+35°C to +115°C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45°C to +15°C), asserting when the temperature is below the threshold.

The MAX6501–MAX6504 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-220 packages.

____________________________Features

♦ ±0.5°C (typical) Threshold Accuracy Over

Full Temperature Range

♦ No External Components Required

♦ Low Cost

♦ 30µA Supply Current

♦ Factory-Programmed Thresholds from

-45°C to +115°C in 10°C Increments

♦ Open-Drain Output (MAX6501/MAX6503)

Push-Pull Output (MAX6502/MAX6504)

♦ Pin-Selectable +2°C or +10°C Hysteresis

♦ SOT23-5 and TO220-7 Packages

MAX6501–MAX6504

†

Low-Cost, +2.7V to +5.5V, Micropower

Temperature Switches in SOT23 and TO-220

________________________________________________________________ Maxim Integrated Products 1

19-1280; Rev 3; 11/01

Ordering Information

*These parts are offered in eight standard temperature versions with a minimum order of 2,500 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 MAX6501UKP065-T describes a MAX6501 in a SOT23-5 package with a +65°C threshold. Contact the factory for pricing and availability of nonstandard temperature versions (minimum order 10,000 pieces).

________________________Applications

µP Temperature Monitoring in High-Speed Computers

Temperature Control

Temperature Alarms

Fan Control

Selector Guide and Pin Configurations appear at end of data sheet.

PART*

MAX6501UK_ _ _ _-T

-55°C to +125°C

TEMP. RANGE PIN-PACKAGE

5 SOT23-5

MAX6503UK_ _ _ _-T

-55°C to +125°C 5 SOT23-5

MAX6504UK_ _ _ _-T

-55°C to +125°C 5 SOT23-5

MAX6502UK_ _ _ _-T

-55°C to +125°C 5 SOT23-5

†

Patents Pending

MAX6501CM_ _ _ _-T -55°C to +125°C 7 TO-220-7

MAX6502CM_ _ _ _-T -55°C to +125°C 7 TO-220-7

MAX6503CM_ _ _ _-T -55°C to +125°C 7 TO-220-7

MAX6504CM_ _ _ _-T -55°C to +125°C 7 TO-220-7

Typical Operating Circuit

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

+2.7V TO +5.5V

MAX6502

TOVER

INT

µP

GND HYST

GND GND

MAX6501–MAX6504

Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, R

PULL-UP

= 100kΩ (MAX6501/MAX6503 only), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are

at T

= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional 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: 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design. Note 2: The MAX6501–MAX6504 are available with internal, factory-programmed temperature trip thresholds from -45°C to +115°C

in +10°C increments (see Selector Guide).

Note 3: Guaranteed by design.

Supply Voltage (V

) ...............................................-0.3V to +7V

TOVER (MAX6501) ...................................................-0.3V to +7V

TOVER (MAX6502).....................................-0.3V to (V

+ 0.3V)

TUNDER (MAX6503) ................................................-0.3V to +7V

TUNDER (MAX6504) ..................................-0.3V to (V

+ 0.3V)

All Other Pins..............................................-0.3V to (V

+ 0.3V)

Input Current (all pins) ........................................................20mA

Output Current (all pins) .....................................................20mA

Continuous Power Dissipation (T

= +70°C)

5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .........571mW

Operating Temperature Range .........................-55°C to +125°C

Storage Temperature Range .............................-65°C to +165°C

Lead Temperature (soldering, 10sec) .............................+300°C

-45°C to -25°C

VCC= 2.7V, V

TUNDER

= 5.5V (MAX6503),

TOVER

= 5.5V (MAX6501)

-15°C to +15°C

HYST = GND

SOURCE

= 500µA, VCC> 2.7V

(MAX6502/MAX6504 only)

SINK

= 1.2mA, VCC> 2.7V

CONDITIONS

-6 ±0.5 6

µA30 85I

V2.7 5.5V

Supply Voltage Range

Supply Current

nA10

Open-Drain Output Leakage Current

-4 ±0.5 4

HYST

Temperature Threshold Hysteresis

0.8 x V

0.3

UNITSMIN TYP MAXSYMBOLPARAMETER

+35°C to +65°C

+75°C to +115°C

-4 ±0.5 4

°C

-6 ±0.5 6

∆T

Temperature Threshold Accuracy (Note 2)

0.2 x V

HYST Input Threshold (Note 3)

0.8 x V

SINK

= 3.2mA, VCC> 4.5V

0.4

Output Voltage Low

HYST = V

°C

SOURCE

= 800µA, VCC> 4.5V

(MAX6502/MAX6504 only)

VCC- 1.5

Output Voltage High

MAX6501–MAX6504

Low-Cost, +2.7V to +5.5V, Micropower

Temperature Switches in SOT23 and TO-220

_______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

(VCC= +5V, R

PULL-UP

= 100kΩ (MAX6501/MAX6503), TA= +25°C, unless otherwise noted.)

TRIP THRESHOLD ACCURACY

SAMPLE SIZE = 300

PERCENTAGE OF PARTS SAMPLED (%)

-5 -4 -3 -2 -1 0 1 2 3 4 5

OUTPUT SINK RESISTANCE

160

140

120

100

OUTPUT SINK RESISTANCE (Ω)

-55 5-25 356595125

SUPPLY CURRENT

vs. TEMPERATURE

MAX6501 TOC-A

SUPPLY CURRENT (µA)

-55 5-25 356595125

ACCURACY (°C)

TEMPERATURE (°C)

SOT23 THERMAL STEP RESPONSE

vs. TEMPERATURE

VCC = 2.7V

MAX6501 TOC03

VCC = 3.3V

+15°C/div

VCC = 5.0V

TEMPERATURE (°C)

IN PERFLUORINATED FLUID

MOUNTED ON 0.75in OF 2 oz. COPPER

5sec/div

MAX6501 TOC4

MAX6501 TOC01

+100°C

+12.5°C/div

+25°C

MAX6502/MAX6504

OUTPUT SOURCE RESISTANCE

vs. TEMPERATURE

800

700

600

500

400

300

200

OUTPUT SOURCE RESISTANCE (Ω)

100

-55 5-25 356595125 TEMPERATURE (°C)

VCC = 2.7V

VCC = 3.3V

SOT23 THERMAL STEP RESPONSE

IN STILL AIR

MOUNTED ON 0.75in OF 2 oz. COPPER

20sec/div

= 5.0V

MAX6501 TOC5

MAX6501 TOC02

+100°C

+25°C

HYSTERESIS

vs. TRIP TEMPERATURE

MAX6503

MAX6504 HYST = V

HYSTERESIS (°C)

MAX6503 MAX6504 HYST = GND

-5 15-25-45 35557595115 TRIP TEMPERATURE (°C)

MAX6501 MAX6502 HYST = V

MAX6501 MAX6502 HYST = GND

MAX6501 TOC8

MAX6501 START-UP AND POWER-DOWN

)

(T < T

TRACE A: TOVER VOLTAGE, R TRACE B: V

PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT

PULL-UP

= 100kΩ

MAX6501 TOC07

MAX6501 START-UP DELAY

TRACE A: TOVER VOLTAGE, R TRACE B: V

PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT

(T > T

PULL-UP

)

= 100kΩ

MAX6501 TOC07A

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