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.)