Rainbow Electronics MAX6512 User Manual

General Description

The MAX6511/MAX6512/MAX6513 are fully integrated,
remote temperature switches that use an external P-N
junction (typically a diode-connected transistor) as the
sensing element to measure the remote temperature.
These devices assert a logic signal when the tempera­ture crosses a factory-programmed threshold. Available
trip thresholds are from +45°C to +125°C in 10°C incre­ments. Accuracy is within ±3°C (T

A

= -5°C to +55°C) or
±5°C (TA= -40°C to +85°C). Hysteresis is pin selec­table to 5°C or 10°C.

The MAX6511 has an active-low CMOS output and the
MAX6513 has an active-high CMOS output. The
MAX6512 has an open-drain output. The output is
asserted when the temperature exceeds the threshold
value. The active-low open-drain output is intended to
interface with a microprocessor (µP) reset or interrupt
input. The active-high CMOS output can directly drive a
power FET to control a cooling fan.

The MAX6511/MAX6512/MAX6513 operate from a
+3.0V to +5.5V supply and typically consume 400µA of
supply current. They are available in a small 6-pin
SOT23 package.

________________________Applications

CPU Temperature Monitoring in High-Speed
Computers

Multichip Modules
Battery Packs
Temperature Control
Temperature Alarms
Fan Control

Features

♦ Continuously Measure External Junction

Temperature

♦ Factory-Programmed Temperature Threshold

from +45°C to +125°C in 10°C Increments

♦ Insensitive to Series Parasitic Resistance

♦ Active-Low CMOS Output (MAX6511) or Open-

Drain Output for Overtemperature Alarm
(MAX6512) or Active-High Output (MAX6513) for
Direct Fan Control

♦ <100ms Response Time

♦ Accuracy

±3°C (T

REMOTE =

+45°C to +125°C, TA= -5°C to +55°C)

±5°C (T

REMOTE =

+45°C to +125°C, TA= -40°C to +85°C)

♦ Pin-Selectable 5°C or 10°C Hysteresis

♦ 400µA Average Current Consumption

♦ +3.0V to +5.5V Supply Range

♦ 6-Pin SOT23 Package

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-1819; Rev 0; 10/00

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

*These parts are offered in nine standard temperature versions
with a minimum order of 2500 pieces. To complete the suffix infor­mation, select an available trip point in degrees centigrade from
the device marking codes table. For example, the
MAX6511UT065-T describes a MAX6511 in a SOT23-6 package
with a +65°C threshold.

Typical Operating Circuit appears at end of data sheet.

TOP VIEW

16DXP

V

DD

GND

2

34

( ) ARE FOR MAX6513 SOT23 ONLY.

MAX6511
MAX6512
MAX6513

5 DXN

TOVER (TOVER)HYST

PART* TEMP. RANGE

M AX6 511EUT_ _ _ -T -40°C to +85°C 6 SOT23-6

M AX6 512EUT_ _ _ -T -40°C to +85°C 6 SOT23-6 Open-Drain

M AX6 513EUT_ _ _ -T -40°C to +85°C 6 SOT23-6

PIN­PACKAGE

OUTPUT

CMOS

(Active-Low)

CMOS

(Active-High)

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

DD

= +3.0V to +5.5V, CS= 2200pF, TA= -40°C to +85°C, T

REMOTE

= +45°C to +125°C (Note 1), unless otherwise noted. Typical

values are at T

A

= +25°C.) (Note 2)

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: T

REMOTE

refers to the temperature of the remote-sensing junction. TArefers to the temperature of the MAX6511/MAX6512/

MAX6513 package.

Note 2: All parameters are 100% production tested at T

A

= +25°C. Specifications over temperature limits are guaranteed by design.

Note 3: This parameter is guaranteed by design to ±3.5 sigma.

Supply Voltage (V

DD

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

DXP, DXN, HYST, TOVER (MAX6513),

TOVER (MAX6511/MAX6512) ................-0.3V to (V

DD

+ 0.3V)

TOVER (MAX6513), TOVER (MAX6511)

Output Current ....................................................-1mA/+50mA

DXN Input Current...................................................-1mA/+50mA

Current (all other pins)......................................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23-6 (derate 9.1mW/°C above +70°C) ........727mW

Operating Temperature Range ...........................-40°C to +85°C

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

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

Lead Temperature

Vapor Phase (60s) .......................................................+215°C

Infrared (15s) ...............................................................+220°C

Supply Voltage Range V

Supply Current I

Temperature Threshold
Accuracy (Note 3)

Power-Supply Sensitivity for
Temperature Trip Point

Temperature Threshold
Hysteresis

Response Time 70 120 ms

Input Voltage High V

Input Voltage Low V

Output Voltage High V

Output Voltage Low V

Maximum DXP Source
Current

Minimum DXP Source
Current

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DD

DD

∆T

T

HYST

OH

OL

TA = -5°C to +55°C -3.0 +3.0

TH

TA = -40°C to +85°C -5.0 +5.0

HYST = V

HYST = V

IH

IL

MAX6511/MAX6513, I

I

0.4V ≤ V
DXN = GND

0.4V ≤ V
DXN = GND

3.0 5.5 V

400 600 µA

-0.6 °C/V

IL

IH

5

10

VDD -

0.2

0.2 V

V

= 1mA

OUT

= 1mA 0.2 V

OUT

≤ 2V,

DXP

≤ 2V,

DXP

DD

- 0.2

270 µA

9µA

°C

°C

V

V

MAX6511/MAX6512/MAX6513

Low-Cost, Remote SOT Temperature Switches

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(VDD= +3.3V, CS= 2200pF, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. AMBIENT TEMPERATURE

440

420

400

380

360

SUPPLY CURRENT (µA)

340

320

300

-40 10-15 35 60 85
AMBIENT TEMPERATURE TA (°C)

(NOTE: SUPPLY CURRENT
INCLUDES EXTERNAL
DIODE-CONNECTED
TRANSISTOR)

MAX6511 toc01

TEMPERATURE TRIP THRESHOLD ERROR

vs. AMBIENT TEMPERATURE T

0.2

0

-0.2

-0.4

-0.6

-0.8

-1.0

-1.2

-1.4

TEMPERATURE TRIP THRESHOLD ERROR (°C)

-1.6

-60 -40 -20 0 20 40 8060 100 120 140
AMBIENT TEMPERATURE TA (°C)

TEMPERATURE TRIP THRESHOLD ERROR

A

MAX6511 toc02

14

12

10

8

6

4

2

0

-2

TEMPERATURE TRIP THRESHOLD ERROR (°C)

-4
02010 30 40 50 60

CAPACITANCE

vs. C

S

CS CAPACITANCE (nF)

MAX6511 toc03

TEMPERATURE TRIP THRESHOLD ERROR

vs. SERIES RESISTANCE

1.0

0.5

0

-0.5

-1.0

-1.5

TEMPERATURE TRIP THRESHOLD ERROR (°C)

-2.0
0806020 40 100 120 140 160 180 200

SERIES RESISTANCE (Ω)

MAX6511 toc04

TEMPERATURE TRIP THRESHOLD

vs. SUPPLY VOLTAGE

0.4

0.2

0

-0.2

-0.4

-0.6

-0.8

-1.0

-1.2

-1.4

-1.6

TEMPERATURE TRIP THRESHOLD ERROR (°C)

-1.8

3.0 4.03.5 4.5 5.0 5.5
SUPPLY VOLTAGE (V)

MAX6511 toc05