Rainbow Electronics MAX6515 User Manual

General Description

The MAX6514/MAX6515 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 a fixed voltage reference, an analog temperature
sensor, and a comparator. They are available with facto­ry-trimmed temperature trip thresholds from -45°C to
+15°C and +35°C to +115°C in 10°C increments, and are
accurate to ±1°C (typ). These devices require no external
components and typically consume 22µA of supply cur­rent. Hysteresis is pin selectable at 2°C or 10°C.

The MAX6514/MAX6515 are offered with hot-tempera­ture thresholds (+35°C to +115°C), asserting when the
temperature is above the threshold or with cold-temper­ature thresholds (-45°C to +15°C), asserting when the
temperature is below the threshold. The MAX6514/
MAX6515 can be used over a -35°C to +125°C range
with a supply voltage of 2.7V to 5.5V. For applications
sensing temperature down to -45°C, a supply voltage
above 4.5V is required.

The MAX6514 has an active-high, push-pull output. The
MAX6515 has an active-low, open-drain output. These
devices are available in a space-saving 5-pin SOT23
package and operate over the -55°C to +125°C tem­perature range.

Applications

Over/Undertemperature Protection
Fan Control
Test Equipment
Temperature Control
Temperature Alarms
Notebook, Desktop PCs
RAID
Servers

Features

♦ High-Accuracy +1.5°C (max) over -15°C to +65°C

Temperature Range

♦ Low-Power Consumption: 22µA Typical Current

♦ Factory-Programmed Thresholds from -45°C to

+115°C in 10°C Increments

♦ Open-Drain or Push-Pull Outputs

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

♦ Low Cost

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3147; Rev 0; 1/04

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.

Pin Configurations and Functional Diagram appear at end of
data sheet.

PART TEMP RANGE

PIN­PACKAGE

MAX6514UK_ _ _ _-T*

5 SOT23-5

MAX6515UK_ _ _ _-T*

5 SOT23-5

*These parts are offered in 16 standard temperature versions

with a minimum order of 2500 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 MAX6514UKP065-T describes a MAX6514 in a
5-pin SOT23 package with a +65°C threshold in tape and reel
(2.5k minimum order). Contact the factory for pricing and avail­ability.

Typical Operating Circuit

MAX6515

MICROCONTROLLER

V

CC

0.1µF

V

CC

V

CC

100kΩ

GND

GND HYST

INT

TOVER

GND

-55°C to +125°C

-55°C to +125°C

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= 2.7V to 5.5V, R

PULLUP

= 100kΩ, (open-drain output only), TA= -55°C to +125°C, 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 are guaranteed by design.
Note 2: The MAX6514/MAX6515 are available with internal factory-programmed temperature trip thresholds from -45°C to +15°C

and +35°C to +115°C in 10°C increments.

Note 3: V

CC

must be greater than 4.5V for a switching threshold of -45°C.

Note 4: Guaranteed by design.

All Voltages Are Referenced to GND
V

CC

..........................................................................-0.3V to +6V

TOVER, TUNDER (open drain)................................ -0.3V to +6V

TOVER, TUNDER (push-pull)....................... -0.3V to V

CC

+ 0.3V

HYST.............................................................-0.3V to V

CC

+ 0.3V

Continuous Power Dissipation

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

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

Junction Temperature..................................................... +150°C

Storage Temperature Range .............................-65°C to +150°C

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

PARAMETER

CONDITIONS

UNITS

Supply Voltage Range V

CC

2.7 5.5 V

Hot-temperature thresholds
(+35°C to +115°C)

22 40

Supply Current I

CC

Cold-temperature thresholds
(-45°C to +15°C)

40

µA

-15°C to +65°C
+75°C to +115°C

Temperature Threshold Accuracy
(Note 2)

∆T

TH

-45°C to -25°C (Note 3) -3 +3

°C

HYST = V

CC

2

Temperature Threshold
Hysteresis

T

HYST

HYST = GND 10

°C

V

IH

0.8 x V

CC

HYST Input Threshold (Note 4)

V

IL

V

I

SOURCE

= 500µA, V

CC

> 2.7V 0.8 x V

CC

Logic Output Voltage High
(Push-Pull)

V

OH

I

SOURCE

= 800µA, V

CC

> 4.5V VCC - 1.5

V

I

SINK

= 1.2mA, V

CC

> 2.7V 0.3

Logic Output Voltage Low
(Push-Pull and Open Drain)

V

OL

I

SINK

= 3.2mA, V

CC

> 4.5V 0.4

V

Open-Drain Output Leakage
Current

V

CC

= 2.7V, open-drain output = 5.5V 10 nA

SYMBOL

MIN TYP MAX

-1.5 +1.5

-2.5 +2.5

0.2 x V

CC

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 3

TRIP THRESHOLD ACCURACY

MAX6514 toc01

ACCURACY (°C)

PERCENTAGE OF PARTS SAMPLED (%)

-0.25 TO

-0.5

-0.75 TO

-1.0

10

20

30

40

50

0

-1.25 TO

-1.5

0.25 TO

0.5

0.75 TO

1.0

1.25 TO

1.5

SAMPLE SIZE = 147

SUPPLY CURRENT

vs. TEMPERATURE

MAX6514 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

105856545255-15-35

5

10

15

20

25

30

0

-55 125

TOVER/TUNDER OUTPUT VOLTAGE HIGH

vs. SOURCE CURRENT

MAX6514 toc03

I

SINK

(mA)

V

OH

(V)

987654321

1

2

3

4

5

0

010

MAX6514 toc04

I

SINK

(mA)

V

OL

(V)

987654321

100

200

300

400

500

0

010

TOVER/TUNDER OUTPUT VOLTAGE LOW

vs. SINK CURRENT

STARTUP AND POWER-DOWN (TEMP < TTH)

MAX6514 toc05

TIME (400µs/div)

V

CC

(2V/div)

TOVER
(2V/div)

STARTUP DELAY (TEMP > TTH)

MAX6514 toc06

TIME = 100µs

V

CC

(2V/div)

TOVER
(2V/div)

Typical Operating Characteristics

(VCC= 4.5V, TA = +25°C, unless otherwise noted.)

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

4 _______________________________________________________________________________________

Pin Description

Detailed Description

The MAX6514/MAX6515 fully integrated temperature
switches incorporate a fixed reference, an analog tem­perature sensor, and a comparator. Pin-selectable 2°C
or 10°C hysteresis keeps the digital output from oscil­lating when the die temperature approaches the
threshold temperature. The MAX6514 has an active­high, push-pull output structure that can sink or source
current. The MAX6515 has an active-low, open-drain
output structure that can only sink current. The internal
power-on reset circuit guarantees the logic output is at
its +25°C state for at least 50µs.

Hysteresis Input

The HYST input selects the devices’ temperature hys­teresis and prevents the output from oscillating when the
temperature approaches the trip point. Connect HYST to
VCCfor 2°C hysteresis or to GND for 10°C hysteresis.

Logic Temperature Indicators

Overtemperature Indicator (Hot Thresholds)

TOVER and TOVER designations apply to thresholds
above T

A

= +25°C (+35°C, +45°C, +55°C, +65°C,
+75°C, +85°C, +95°C, +105°C, and +115°C). All “hot”
thresholds are positive temperatures.

The overtemperature indicator output is open drain
active low (TOVER) or push-pull active high (TOVER).
TOVER goes low when the die temperature exceeds
the factory-programmed temperature threshold. TOVER
should be pulled up to a voltage no greater than 5.5V
with a 100kΩ pullup resistor. TOVER is a push-pull
active-high CMOS output that goes high when the die
temperature exceeds the factory-programmed temper­ature threshold.

Undertemperature Indicator (Cold Thresholds)

TUNDER and TUNDER designations apply to thresh­olds below TA= +25°C (+15°C, +5°C, -5°C, -15°C,

-25°C, -35°C, -45°C). The undertemperature indicator
output is open-drain, active low (TUNDER) or push-pull,
active high (TUNDER). TUNDER goes low when the die
temperature goes below the factory-programmed tem­perature threshold. TUNDER should be pulled up to a
voltage no greater than 5.5V with a 100kΩ pullup resis­tor. TUNDER is a push-pull active-high CMOS output
that goes high when the die temperature falls below the
factory-programmed temperature threshold.

PIN

FUNCTION

1, 2 1, 2 GND Ground

33HYST Hysteresis Input. Connect to VCC for 2°C of hysteresis or to GND for 10°C hysteresis.
44VCCInput Supply. Bypass to ground with a 0.1µF capacitor.

5—

Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature
exceeds the factory-programmed hot-temperature threshold.

—5

Open-Drain, Active-Low Output (Hot Threshold). TOVER goes low when the die temperature
exceeds the factory-programmed hot-temperature threshold. Connect to a 100kΩ pullup
resistor. Can be pulled up to a voltage higher than V

CC

.

5—

Push-Pull Active-High Output (Cold Threshold). TUNDER goes high when the die temperature
falls below the factory-programmed cold-temperature threshold.

—5

Open-Drain, Active-Low Output (Cold Threshold). TUNDER goes low when the die
temperature goes below the factory-programmed cold-temperature threshold. Connect to a
100kΩ pullup resistor. Can be pulled up to a voltage higher than V

CC

.

MAX6514 MAX6515

NAME

TOVER

TOVER

TUNDER

TUNDER

Applications Information

Temperature-Window Alarm

The MAX6515 logic output asserts when the die tem­perature is outside the factory-programmed range.
Combining the outputs of two devices creates an
over/undertemperature alarm. Two MAX6515s are used
to form two complementary pairs, containing one cold
trip-point output and one hot trip-point output. The
assertion of either output alerts the system to an out-of­range temperature (Figure 1).

The thermal overrange signal can be used to assert a
thermal shutdown, power-up, recalibration, or other
temperature-dependent function.

Low-Cost, Fail-Safe Temperature

In high-performance/high-reliability applications, multi­ple temperature monitoring is important. The high-level
integration and low cost of the MAX6514/MAX6515
facilitate the use of multiple temperature monitors to
increase system reliability. The Figure 2 application
uses two MAX6514s with different hot-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
MAX6514 triggers a system shutdown if the die temper­ature reaches +75°C, preventing damage from a wide
variety of destructive fault conditions, including
latchups, short circuits, and cooling-system failures.

Thermal Considerations

The MAX6514/MAX6515 supply current is typically
22µA. When used to drive high-impedance loads, the
devices dissipate negligible power and self-heating
effects are minimized.

Accurate temperature monitoring depends on the ther­mal resistance between the device being monitored
and the MAX6514/MAX6515 die. Heat flows in and out
of plastic packages, primarily through the leads. Pin 2
of the 5-pin SOT23 package provides the lowest ther­mal resistance to the die. Short, wide copper traces
between the MAX6514/MAX6515 and the objects
whose temperature is being monitored ensure heat
transfers occur 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
MAX6514/MAX6515, and θJAis the thermal resistance
of the package.

The typical thermal resistance is +140°C/W for the 5­pin SOT23 package. To limit the effects of self-heating,
minimize the output current. For example, if the
MAX6514/MAX6515 sink 1mA, the open-drain 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 5-pin SOT23 package.

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 5

MAX6515UKP075

MAX6515UKN005

V

CC

V

CC

+5V

100kΩ

GND

GND HYST

TUNDER

TOVER

GND

OUT OF RANGE

GND HYST

Figure 1. Temperature-Window Alarms Using the MAX6515

Figure 2. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor

+5V

V

CC

TOVER

MAX6514UKP075

HEAT

µP

GND

HEAT

GND

V

CC

MAX6514UKP045

GND

GND

GND

HYST

TOVERHYST

SYSTEM

SHUTDOWN

FAN

CONTROL

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

6 _______________________________________________________________________________________

Table 1. Top Marks

PART TOP MARK

MAX6514UKN005 AEKU
MAX6514UKN015 AEKV
MAX6514UKN025 AEKW
MAX6514UKN035 AECV
MAX6514UKN045 AEKX
MAX6514UKP005 AEKY
MAX6514UKP015 AEKZ
MAX6514UKP035 AELA
MAX6514UKP045 AELB
MAX6514UKP055 AELC
MAX6514UKP065 AELD
MAX6514UKP075 AECW
MAX6514UKP085 AELE
MAX6514UKP095 AELF
MAX6514UKP105 AELG
MAX6514UKP115 AELH

Pin Configurations

PART TOP MARK

MAX6515UKN005 AEMK
MAX6515UKN015 AEML
MAX6515UKN025 AEMM
MAX6515UKN035 AECX
MAX6515UKN045 AEMN
MAX6515UKP005 AEMO
MAX6515UKP015 AEMP
MAX6515UKP035 AEMQ
MAX6515UKP045 AEMR
MAX6515UKP055 AEMS
MAX6515UKP065 AEMT
MAX6515UKP075 AECY
MAX6515UKP085 AEMU
MAX6515UKP095 AEMV
MAX6515UKP105 AEMW
MAX6515UKP115 AEMX

TOP VIEW

HOT THRESHOLDS (+35°C TO +115°C)

15(TOVER)

GND

(MAX6514)

2

GND

HYST

MAX6515

34

SOT23

TOVER

V

CC

COLD THRESHOLDS (-45°C TO +15°C)

15(TUNDER)

GND

2

GND

HYST

34

(MAX6514)

MAX6515

SOT23

TUNDER

V

CC

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 7

Chip Information

TRANSISTOR COUNT: 1808
PROCESS: BiCMOS

MAX6514/MAX6515 Functional Diagram

FIXED

REFERENCE

HYST

NETWORK

HYST

TOVER

TOVER

COLD

MAX6514 (HOT THRESHOLD)

+25°CT

TH

HOT

TEMP

V

NEGATIVE

TEMPCO

SENSOR

MAX6514

FIXED

REFERENCE

HYST

NETWORK

HYST

TOVER

TOVER

COLD

MAX6515 (HOT THRESHOLD)
WITH 100kΩ PULLUP

+25°CT

TH

HOT

TEMP

V

NEGATIVE

TEMPCO
SENSOR

MAX6515

FIXED

REFERENCE

HYST

NETWORK

HYST

TUNDER

TUNDER

COLD

MAX6514 (COLD THRESHOLD)

+25°C

T

TH

HOT

TEMP

V

NEGATIVE

TEMPCO

SENSOR

MAX6514

FIXED

REFERENCE

HYST

NETWORK

HYST

TUNDER

COLD

MAX6515 (COLD THRESHOLD)
WITH 100kΩ PULLUP

+25°C

T

TH

HOT

TEMP

V

NEGATIVE

TEMPCO

SENSOR

MAX6515

TUNDER

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

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

© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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 www.maxim-ic.com/packages

.)

SOT-23 5L .EPS

E

1

1

21-0057

PACKAGE OUTLINE, SOT-23, 5L