Maxim MAX6504UKN015-T, MAX6504CMP005-T, MAX6504CMP015-T, MAX6504CMN025-T, MAX6504CMN035-T Datasheet

________________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 2; 11/99

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

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

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

+2.7V TO +5.5V

V

CC

MAX6502

TOVER

INT

V

CC

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

A

= +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

CC

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

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

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

CC

+ 0.3V)

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

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

CC

+ 0.3V)

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

CC

+ 0.3V)

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

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

Continuous Power Dissipation (T

A

= +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),

V

TOVER

= 5.5V (MAX6501)

-15°C to +15°C

HYST = GND

I

SOURCE

= 500µA, VCC> 2.7V

(MAX6502/MAX6504 only)

I

SINK

= 1.2mA, VCC> 2.7V

CONDITIONS

-6 ±0.5 6

µA30 85I

CC

V2.7 5.5V

CC

Supply Voltage Range

Supply Current

nA10

Open-Drain Output Leakage
Current

-4 ±0.5 4

2

T

HYST

Temperature Threshold
Hysteresis

V

0.8 x V

CC

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

TH

Temperature Threshold
Accuracy (Note 2)

V

0.2 x V

CC

V

IL

HYST Input Threshold
(Note 3)

0.8 x V

CC

V

IH

I

SINK

= 3.2mA, VCC> 4.5V

V

0.4

V

OL

Output Voltage Low

HYST = V

CC

10

°C

I

SOURCE

= 800µA, VCC> 4.5V

(MAX6502/MAX6504 only)

VCC- 1.5

V

OH

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

60

SAMPLE SIZE = 300

50

40

30

20

10

PERCENTAGE OF PARTS SAMPLED (%)

0

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

OUTPUT SINK RESISTANCE

160

140

120

100

80

60

40

OUTPUT SINK RESISTANCE (Ω)

20

0

-55 5-25 35 65 95 125

SUPPLY CURRENT

vs. TEMPERATURE

40

35

MAX6501 TOC-A

30

25

20

15

SUPPLY CURRENT (µA)

10

5

0

-55 5-25 35 65 95 125

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

2

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

0

-55 5-25 35 65 95 125
TEMPERATURE (°C)

SOT23 THERMAL STEP RESPONSE

IN STILL AIR

MOUNTED ON 0.75in
OF 2 oz. COPPER

20sec/div

VCC = 2.7V

VCC = 3.3V

VCC = 5.0V

MAX6501 TOC5

2

MAX6501 TOC02

+100°C

+25°C

HYSTERESIS

vs. TRIP TEMPERATURE

16

MAX6503

14

MAX6504
HYST = V

12

10

8

6

HYSTERESIS (°C)

4

2

0

CC

MAX6503
MAX6504
HYST = GND

-5 15-25-45 35 55 75 95 115
TRIP TEMPERATURE (°C)

MAX6501
MAX6502
HYST = V

MAX6501
MAX6502
HYST = GND

CC

MAX6501 TOC8

MAX6501 START-UP AND POWER-DOWN

)

(T < T

TH

TRACE A: TOVER VOLTAGE, R
TRACE B: V

PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT

CC

PULL-UP

= 100kΩ

MAX6501 TOC07

MAX6501 START-UP DELAY

A

B

TRACE A: TOVER VOLTAGE, R
TRACE B: V

PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT

CC

(T > T

PULL-UP

TH

)

= 100kΩ

MAX6501 TOC07A

A

B

MAX6501–MAX6504

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

4 _______________________________________________________________________________________

Pin Description

1, 2 1, 2

Ground. Not internally connected. Tie both ground pins togeth­er close to the chip. Pin 2 provides the lowest thermal resis­tance to the die.

1, 2

PIN

1, 2 GND

3 3

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

CC

for +10°C hysteresis.

3 3 HYST

4 4 Supply Input (+2.7V to +5.5V)

5 —

Open-Drain, Active-Low Output. TOVER goes low when the die
temperature exceeds the factory-programmed temperature
threshold. Connect to a 100kΩ pull-up resistor. May be pulled
up to a voltage higher than V

CC

.

— —

TOVER

4 4 V

CC

— 5

Push-Pull Active-High Output. TOVER goes high when the die tem­perature exceeds the factory-programmed temperature threshold.

— —

Open-Drain, Active-Low Output. TUNDER goes low when the
die temperature goes below the factory-programmed tempera­ture threshold. Connect to a 100kΩ pull-up resistor. May be
pulled up to a voltage higher than V

CC

.

5 —

TUNDER

— —

Push-Pull Active-High Output. TUNDER goes high when the die tem­perature falls below the factory-programmed temperature threshold.

— 5 TUNDER

— — TOVER

MAX6502MAX6501 MAX6503 MAX6504

NAME FUNCTION

________________General Description

The MAX6501–MAX6504 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
+10°C hysteresis keeps the output from oscillating
when the die temperature approaches the threshold
temperature. The MAX6501/MAX6503 have an active­low, open-drain output structure that can only sink cur­rent. The MAX6502/MAX6504 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 TTH= +25°C state at start-up for 50µs.

The MAX6501–MAX6504 are available with factory­preset temperature thresholds from -45°C to +115°C in
10°C increments. Table 1 lists the available temperature
threshold ranges. The MAX6501/MAX6503 outputs are
intended to interface with a microprocessor (µP) reset
input (Figure 2). The MAX6502/MAX6504 outputs are
intended for applications such as driving a fan control
(Figure 3).

Hysteresis Input

The HYST pin is a CMOS-compatible input that selects
hysteresis at either a high level (+10°C for HYST = VCC)
or a low level (+2°C for HYST = GND). Hysteresis pre­vents the output from oscillating when the temperature
approaches the trip point. The HYST pin should not
float. Drive HYST close to ground or VCC. 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.)

Table 1. Factory-Programmed Threshold
Range

+35°C < TTH< +115°C

+35°C < TTH< +115°C

THRESHOLD (TTH) RANGE

-45°C < TTH< +15°C

-45°C < TTH< +15°C

MAX6503

MAX6504

MAX6501

MAX6502

PART

MAX6501–MAX6504

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

Temperature Switches in SOT23 and TO-220

_______________________________________________________________________________________ 5

Figure 1. Block and Functional Diagrams

POSITIVE
TEMPCO

REFERENCE

NEGATIVE

TEMPCO

REFERENCE

HYST

NETWORK

MAX6501

TOVER

HYST

V

TOVER

COLD +25°CT

MAX6501

WITH 100kΩ PULL-UP

TH

HOT

TEMP

POSITIVE
TEMPCO

REFERENCE

POSITIVE
TEMPCO

REFERENCE

NEGATIVE

TEMPCO

REFERENCE

NEGATIVE

TEMPCO

REFERENCE

HYST

NETWORK

MAX6502

HYST

NETWORK

MAX6503

TOVER

HYST

TUNDER

HYST

TOVER

TUNDER

TUNDER

V

COLD +25°CT

V

COLD T

V

TH

MAX6502

TH

WITH 100kΩ PULL-UP

+25°C HOT

HOT

MAX6503

MAX6504

TEMP

TEMP

POSITIVE
TEMPCO

REFERENCE

NEGATIVE

TEMPCO

REFERENCE

HYST

NETWORK

MAX6504

TUNDER

HYST

COLD T

TH

+25°C HOT

TEMP

MAX6501–MAX6504

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

6 _______________________________________________________________________________________

Applications Information

Thermal Considerations

The MAX6501–MAX6504 supply current is typically
30µA. 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 MAX6501–
MAX6504 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-220 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
MAX6501–MAX6504 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:

∆TJ= P

DISSIPATION

x θ

JA

where P

DISSIPATION

is the power dissipated by the
MAX6501–MAX6504, and θJAis the package’s thermal
resistance.

The typical thermal resistance is 140°C/W for the
SOT23-5 package and 75°C/W for the TO-220 pack­age. To limit the effects of self-heating, minimize the
output currents. For example, if the MAX6501 or
MAX6503 sink 1mA, the output voltage is guaranteed to
be less than 0.3V. Therefore, an additional 0.3mW of

power is dissipated within the IC. This corresponds to a

0.042°C shift in the die temperature in the SOT23-5.

Temperature-Window Alarm

The MAX6501–MAX6504 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
MAX6501/MAX6503 and the MAX6502/MAX6504 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 MAX6502/MAX6504
push/pull output stages can be ORed to produce a ther­mal out-of-range alarm. More favorably, a MAX6501/
MAX6503 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 MAX6501–MAX6504
facilitate the use of multiple temperature monitors to in­crease system reliability. Figure 5’s application uses two
MAX6502s 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 MAX6502 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.

Figure 3. Overtemperature Fan Control

Figure 2. Microprocessor Alarm/Reset

+3.3V

V

CC

µP

INT

SHUTDOWN

OR

RESET

R

PULL-UP

100k

HEAT

TOVER

V

CC

MAX6501

GNDHYST GND

+5V

V

CC

µP FAN

HEAT

V

CC

HYST

MAX6502

TOVERGNDGND

MAX6501–MAX6504

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

Temperature Switches in SOT23 and TO-220

_______________________________________________________________________________________ 7

Figure 4. Temperature-Window Alarms

Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor

Table 2. Device Marking Codes for SOT23-5 Package

MAX6502UKP115 2.5kACFY

MAX6502UKP105 10kACFZ

MAX6504UKP015 10kADKE

MAX6504UKP005 2.5kABZY

MAX6504UKN005 10kACAT

MAX6504UKN015 2.5kACGD

MAX6504UKN025 10kACAV

MAX6504UKN035 10kACAW

MAX6504UKN045 10kACAX

DEVICE

MINIMUM

ORDER

CODE

MAX6503UKP015 10kACAM

MAX6503UKP005 2.5kABZX

MAX6503UKN005 10kACAN

MAX6503UKN015 2.5kACFX

MAX6503UKN025 10kACAP

MAX6503UKN035 10kACAQ

MAX6503UKN045 10kADIZ

MAX6502UKP095 2.5kABZW

MAX6502UKP085 2.5kACGA

MAX6502UKP075 2.5kACGB

MAX6502UKP065 2.5kABZV

MAX6502UKP055 2.5kACGC

MAX6502UKP045 2.5kABZU

MAX6502UKP035 10kABZG

MAX6501UKP115 2.5kACAG

MAX6501UKP105 10kACFU

MAX6501UKP095 2.5kABZT

MAX6501UKP085 2.5kACDP

MAX6501UKP075 2.5kACFV

MAX6501UKP065 2.5kABZS

MAX6501UKP055 2.5kACFW

MAX6501UKP045 2.5kABZR

MAX6501UKP035 10kABZF

DEVICE

MINIMUM

ORDER

CODE

+5V

V

CC

MAX6502_ _P075

GND
GND

HYST

V

CC

MAX6504_ _N005

HYST

GND

GND

+5V

V

CC

GNDGND

TOVER

TUNDER

TOVER TUNDER

OVERTEMP

UNDERTEMP

R

PULL-UP

100k

GND

MAX6503_ _N005MAX6501_ _P075

OUT OF RANGE

OUT OF RANGE

V

CC

HYSTHYST GND

+5V

V

CC

HEAT

µP

HEAT

MAX6502_ _P075

GND

GND HYST

V

CC

HYST

MAX6502_ _P045

GND GND

TOVER

TOVER

TEMPERATURE

FAULT

FAN

CONTROL

MAX6501–MAX6504

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

Pin Configurations

Chip Information

TRANSISTOR COUNT: 237
SUBSTRATE CONNECTED TO GND

PART

MAX6501 MAX6502 MAX6503 MAX6504

OUTPUT

STAGE

Open-

Drain

Push-Pull

Open-

Drain

Push-Pull

TRIP TEMP

THRESHOLD

Hot Hot Cold Cold

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

✓ ✓

STANDARD TEMPERATURE THRESHOLDS (°C)

✓ ✓

Selector Guide

-45

-35

-25

-15

-5

+5

+15

+35

+45

+55

+65

+75

+85

+95

+105

+115

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

© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

15TOVER

GND

MAX6501

2

GND

HYST

MAX6502

34

(TOVER)

V

SOT23-5

TO-220-7

MAX6501
MAX6502

1

234

567

HYST

GND

GND

TOVER
(TOVER)

V

TOP VIEW

15TUNDER

GND

MAX6503

2

GND

HYST

CC

CC

MAX6504

34

SOT23-5

TO-220-7

MAX6503
MAX6504

1

234

567

GND

HYST

GND

TUNDER
(TUNDER)

(TUNDER)

V

CC

V

CC

( ) ARE FOR MAX6502.

( ) ARE FOR MAX6504.