MAX6501UKP055-T - ON Semiconductor

 Semiconductor Components Industries, LLC, 2003

February, 2003 - Rev. 2 1Publication Order Number:

MAX6501/D

MAX6501, MAX6502

Ultra Small Temperature

Switch with Pin−Selectable

Hysteresis

The MAX6501 and MAX6502 are SOT-23 temperature switches

that require no external components and the design is facilitated with

factory-programmed temperature thresholds. A choice of

factory-trimmed temperature trip points are available. Pin selectable

hysteresis of +2°C or +10°C allows flexibility to the design. These

parts typically consume only 17 µA of current and operate over the

entire -55°C to +125°C temperature range while offering accuracies

of 0.5°C (typ) and 4°C (max).

The MAX6501 has an open drain, active low output, meant for

microprocessor reset control. The MAX6502 has a CMOS, active high

output designed to drive a logic level MOSFET to turn on a fan or

heater element.

The MAX6501/6502 are aimed for hot-temperature monitoring

(+45°C to +115°C). These devices assert a logic signal when the

temperature goes above the threshold.

The MAX6501 and MAX6502 are offered in five standard

temperature thresholds. Available in 5-Pin SOT-23A packages, these

parts are ideal for applications requiring high integration, small size,

low power and low installed cost.

Features

•5-Pin SOT-23A

•Factory-Programmed Thresholds from +45°C to +115°C in 10°C

Increments

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

•0.5°C (Typ) Threshold Accuracy Over Full Temperature Range

•No External Components Required

•17 µA Supply Current

Typical Applications

•Thermal Management in PCs and Servers

•Over Temperature Fail Safe Circuits

•Simple Fan Controller

•Temperature Alarms

•Projectors/Printers

•Notebook Computers

•Network Boxes

SOT-23A

CASE 1212

PIN CONNECTIONS

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION

See general marking information in the device marking

section on page 9 of this data sheet.

DEVICE MARKING INFORMATION

TOVER

(TOVER)*

GND

VCC

*For MAX6502

Note: 5-Pin SOT-23A is equivalent to EIAJ SC-74A

GND

HYST

MAX6501

MAX6502

http://onsemi.com

MAX6501, MAX6502

http://onsemi.com

MAXIMUM RATINGS*

Rating Symbol Value Unit

Supply Voltage VCC -0.3 to +7.0 V

TOVER (MAX6501) --0.3 to +7.0 V

TOVER (MAX6502) --0.3 to (VCC +0.3) V

All Other Pins --0.3 to (VCC +0.3) V

Input Current (All Pins) -20 mA

Output Current (All Pins) - 20 mA

Operating Temperature Range --55 to +125 °C

Storage Temperature Range Tstg -65 to +165 °C

Lead Temperature (Soldering, 10 seconds) -+300 °C

Power Dissipation (TA = +70°C)

(Derate 7.1 mW/°C Above +70°C) -571 mW

*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses

above 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 above 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 VCC = +2.7 V to +5.5 V, RPULL- UP = 100 KΩ (MAX6501 only), CCOUPLING = 100 pF from VCC

to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at T A = +25°C.

Characteristics Test Conditions Symbol Min Typ Max Unit

Supply Voltage Range - VCC 2.7 - 5.5 V

Supply Current - ICC - 17 40 µA

Temperature Threshold Accuracy

(Note 1) +45°C to +65°C

+75°C to +115°C∆TTH -4.0

-6.0

0.5

0.5 4.0

6.0 °C

Temperature Threshold Hysteresis HYST = GND

HYST = VCC THYST -

-2.0

10 -

-°C

HYST Input Threshold - VIH 0.8 x VCC - - V

HYST Input Threshold - VIL - - 0.2 x VCC V

Output Voltage High ISOURCE = 500 µA, VCC  2.7 V

(MAX6502 Only)

ISOURCE = 800 µA, VCC  4.5 V

(MAX6502 Only)

VOH 0.8 x VCC

VCC -1.5

Output Voltage Low ISINK = 1.2 mA, VCC  2.7 V

ISINK = 3.2 mA, VCC  4.5 V VOL -

-0.3

0.4 V

Open-Drain Output Leakage Current VCC = 2.7 V, VTOVER = 5.5 V

(MAX6501 Only) -- 10 - nA

1. The MAX6501 and MAX6502 are available with internal, factory-programmed temperature trip thresholds from +45°C to +115°C in +10°C

increments.

MAX6501, MAX6502

http://onsemi.com

PIN DESCRIPTION

MAX6501 MAX6502 Name Description

1,2 1,2 GND Ground. Ground both pins together close to the chip. Pin 2 provides the lowest thermal

resistance to the die.

3 3 HYST Hysteresis Input. Connect HYST to GND for +2°C hysteresis, or connect to VCC for +10°C

hysteresis.

4 4 VCC Supply Input (+2.7 V to +5.5 V). Recommend 100 pF or greater Coupling capacitor from VCC

to GND.

5 - TOVER Open-Drain, Active-Low Output. TOVER goes low when the die temperature exceeds the

factory-programmed temperature threshold. Connect to a 100 KΩ pull-up resistor. May be

pulled up to a voltage higher than VCC.

- 5 TOVER Push/Pull Active-High Output. TOVER goes high when the die temperature exceeds the

factory-programmed temperature threshold.

Typical Operating Circuit

GND

MAX6502

GND

VCC VCC

GND HYST

TOVER INT

µP

100 pF

+2.7 V to +5.5 V

DETAILED DESCRIPTION

The MAX6501 and MAX6502 integrate a temperature

sensor with a factory-programmed t hreshold s witch. A l ogic

signal i s a sserted w hen t he d ie t emperature c rosses t he f actory

programmed threshold. An external hysteresis input pin

allows the u ser t o s elect e ither 2°C or 10°C h ysteresis t o g ive

further flexibility to the design of the application. The

MAX6501 and MAX6502 are intended for a temperature

range from 45°C to 115°C in a 10°C increment. The

MAX6501 has an open drain output and the MAX6502 has

a push/pull output stage.

The MAX6501 is intended for applications with a

microprocessor reset input. The MAX6502 is intended for

applications of turning on a fan or heater element.

Hysteresis Input

To prevent the output from “chattering’’ at or near the trip

point temperature, a selectable HYST input pin is provided.

Hysteresis can be externally selected at 2°C (HYST = GND)

or 10 °C (HYST = VDD) by means of the CMOS compatible

HYST input pin. Do not let the HYST pin float as this could

cause increase supply current. The hysteresis does not

depend on the part’s programmed trip threshold.

Table 1. Factory-Programmed Threshold Range

Part Number Threshold (TTH) Range

MAX6501 +45°C  TTH  +115°C

MAX6502 +45°C  TTH  +115°C

Thermal Considerations

With a very low 17 µA supply current, the MAX6501 and

MAX6502 dissipates very little power. Thus, the die

temperature is basically the same as the package

temperature. To minimize the error in temperature readings,

the load current should be limited to a few milliamps. As an

example, the typical thermal resistance of a 5-Pin SOT-23A

package is 140°C/W. If the MAX6501 had to sink 1.0 mA,

and the output voltage is guaranteed to be less than 0.3 V,

then an additional 0.3 mW of power is dissipated within the

IC. This corresponds to a 0.042°C rise in die temperature in

the 5-Pin SOT-23A.

MAX6501, MAX6502

http://onsemi.com

Temperature monitoring accuracy depends on the

thermal r esistance b etween t he d evice b eing m onitored a nd

the temperature switch die. Heat flows primarily through

the leads onto the die. Pin 2 provides the lowest thermal

resistance to the die. To achieve the best temperature

monitoring results, the MAX6501 and MAX6502 should

be placed closest to the device being monitored. In

addition, a short and wide copper trace from Pin 2 to the

device should be used. I n some cases, the 5 -Pin S OT-23A

package can be placed directly under the socketed

microprocessor for improved thermal contact.

APPLICATIONS

The MAX6501 has an open drain output and is therefore

intended to interface as a microprocessor reset input.

Moreover, the combination of these two devices can be used

to implement a t emperature w indow a larm b y w ire-ORing t he

outputs and using an external pull up resistor. (See Figure 1)

GND

MAX6501UKP115-T

VCC

GND HYST

100 pF

+5 V

GND

VCC

GND HYST

MAX6501UKP055-T

Temperature Out of Range

RPULL- UP

100 k

100 pF

Figure 1. Over and Under Temperature Alarm

The MAX6502 can be used to control a DC fan. The fan

turns on when the sensed temperature rises above the factory

set threshold and remains on until the temperature falls

below threshold minus the hysteresis selected. An additional

fail safe measure could be designed by using a second

MAX6502 with a higher temperature threshold to alert the

user of an impending thermal shutdown, should the

temperature continue to rise. (See Figure 2)

MAX6501, MAX6502

http://onsemi.com

HEAT

GND

MAX6502UKP095-T

HYST

100 pF

+5 V

GND

VCC

GND

HYST

MAX6502UKP055-T

TEMPERATURE

FAULT

µP

100 pF

VCC

GND TOVER

TOVER

FAN

CONTROL

Figure 2. Fan Control Circuit with Over Temperature Alert

MAX6501

MAX6502

HYST

TOVER

Positive

Tempco

Reference

−

Negative

Tempco

Reference HYST

Network

HYST

TOVER

Positive

Tempco

Reference

−

Negative

Tempco

Reference HYST

Network

MAX6501

MAX6502

Figure 3. Functional Block Diagrams

MAX6501

MAX6502

TOVER

COLD +25°CT

TH HOT TEMP

With 100 kΩ Pull-Up

COLD +25°CT

TH HOT TEMP

MAX6501

MAX6502

MAX6501, MAX6502

http://onsemi.com

TYPICAL CHARACTERISTICS

-5

1-1-3 2

ACCURACY (°C)

FREQUENCY

0-4

TEMPERATURE (°C)

Figure 4. Trip Threshold Accuracy Figure 5. Supply Current vs. Temperature

SUPPLY CURRENT (µA)

180

160

120

806040

140

100

20 20 100 120 140

Figure 6. MAX6502 Output Source Resistance

vs. Temperature

TEMPERATURE (°C)

Figure 7. Output Sink Resistance

vs. Temperature

TEMPERATURE (°C)

OUTPUT SINK RESISTANCE (Ω)

OUTPUT SOURCE RESISTANCE (Ω)

Figure 8. Hysteresis vs. Trip Temperature

TRIP TEMPERATURE (°C)

HYSTERESIS (°C)

-45 3515-5-25 55 75 95

-60 20 400-20 60-40 80

040503020 6010 100

VCC = 2.7 V

45-2

0100 120 140

180

VCC = 4.0 V

VCC = 5.0 V

VCC = 2.7 V

VCC = 4.0 V

VCC = 5.0 V

080 9070

115

MAX6501/6502

HYS = GND

HYS = VCC

MAX6501, MAX6502

http://onsemi.com

TYPICAL CHARACTERISTICS

Figure 9. SOT-23 Thermal Step Response

in Perfluorinated Fluid

5 sec/div

20 sec/div

Figure 10. SOT-23 Thermal Step Response

in Still Air

Mounted On 0.75 in2

of 2 oz. Copper

+15°C/div

Mounted On 0.75 in2

of 2 oz. Copper

+100°C

+25°C

+12.5°C/div

+100°C

+25°C

MAX6501, MAX6502

http://onsemi.com

W = Width

of Carrier

Tape

DEVICE

MARKING

DEVICE

MARKING

PIN 1

USER DIRECTION OF FEED

Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices

Standard Reel Component Orientation

TR Suffix Device

(Mark Right Side Up)

SOT-23A

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

8 mm 4 mm 3000 7 inches

Carrier Tape, Reel Size, and Number of Components Per Reel

Reverse Reel Component Orientation

RT Suffix Device

(Mark Upside Down)

PIN 1

USER DIRECTION OF FEED

P = Pitch

MAX6501, MAX6502

http://onsemi.com

and = Two Letter Part Number Codes

= Year and Two-Month Period Code

= Lot ID Number

MARKING DIAGRAM

123 4

ORDERING INFORMATION

Device Package

Standard

Temperature

Threshold Output Stage Marking

and 21 Shipping

MAX6501UKP045-T 45°COpen Drain HA

MAX6501UKP055-T* 55°COpen Drain HB

MAX6501UKP065-T 65°COpen Drain HC

MAX6501UKP075-T 75°COpen Drain HD

MAX6501UKP085-T 85°COpen Drain HE

MAX6501UKP095-T* 95°COpen Drain HF

MAX6501UKP105-T 105°COpen Drain HG

MAX6501UKP115-T*

5 Pin SOT 23A

115°COpen Drain HH

3000 Units Tape and Reel

MAX6502UKP045-T 5-Pin SOT-23A 45°C Push/Pull JA 3000 Units Tape and Reel

MAX6502UKP055-T* 55°C Push/Pull JB

MAX6502UKP065-T 65°C Push/Pull JC

MAX6502UKP075-T 75°C Push/Pull JD

MAX6502UKP085-T 85°C Push/Pull JE

MAX6502UKP095-T* 95°C Push/Pull JF

MAX6502UKP105-T 105°C Push/Pull JG

MAX6502UKP115-T* 115°C Push/Pull JH

*Default: Contact your ON Semiconductor sales representative for other temperature threshold options.

MAX6501, MAX6502

http://onsemi.com

Notes

MAX6501, MAX6502

http://onsemi.com

PACKAGE DIMENSIONS

SOT-23

CASE 1212-01

ISSUE O

DIM MIN MAX

MILLIMETERS

A1 0.00 0.10

A2 1.00 1.30

B0.30 0.50

C0.10 0.25

D2.80 3.00

E2.50 3.10

E1 1.50 1.80

e0.95 BSC

e1 1.90 BSC

L1 0.45 0.75

NOTES:

1. DIMENSIONS ARE IN MILLIMETERS.

2. INTERPRET DIMENSIONS AND TOLERANCES

PER ASME Y14.5M, 1994.

3. DATUM C IS A SEATING PLANE.

0.10 C S

B5X

0.05

0.20 −−−

MAX6501, MAX6502

http://onsemi.com

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make

changes without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any

particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all

liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be

validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.

SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death

may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC

and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that

SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.

PUBLICATION ORDERING INFORMATION

JAPAN: ON Semiconductor, Japan Customer Focus Center

2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051

Phone: 81-3-5773-3850

ON Semiconductor Website: http://onsemi.com

For additional information, please contact your local

Sales Representative.

MAX6501/D

Literature Fulfillment:

Literature Distribution Center for ON Semiconductor

P.O. Box 5163, Denver, Colorado 80217 USA

Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada

Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada

Email: ONlit@hibbertco.com

N. American Technical Support: 800-282-9855 Toll Free USA/Canada