Rainbow Electronics MAX6508 User Manual

General Description

The MAX6505–MAX6508 temperature switches have dual
logic outputs that assert when the die temperature cross­es their trip thresholds. Trip thresholds are factory pro­grammed to convenient temperatures in 5°C increments.

The MAX6505/MAX6506 have an ALARM output that
asserts when the temperature is above the factory-pro­grammed thresholds (available from -40°C to +125°C).
They also have a WARN output that asserts when the
temperature is several degrees below the ALARM thresh­old. The difference between the ALARM and WARN
thresholds (∆TAW) is pin selectable to +5°C, +10°C,
+20°C, or +30°C. The MAX6505’s logic outputs are open
drain, while the MAX6506’s logic outputs are push-pull.

The MAX6507 has open-drain outputs (OVER, OK), and
the MAX6508 has push-pull outputs (OVER, OK), each
with two factory-programmed threshold temperatures
(TOVER and TUNDER) in the wide range of -40°C to
+125°C. The overtemperature output asserts when the
temperature is above TOVER. When the temperature is in
the desired window (less than TOVER and greater than
TUNDER), OK (OK) asserts.

The MAX6505–MAX6508 are accurate to ±0.5°C (typ),
±5.5°C (max). Operating from a +2.5V to +5.5V supply,
these low-cost devices typically consume 30µA supply
current and require no external components for setting
trip points. The MAX6505–MAX6508 are available in a 6­pin SOT23 package.

________________________Applications

µP Temperature Monitoring in High-Speed
Computers

Temperature Control

Temperature Alarms

Fan Control

Features

♦ ±0.5°C (typ) Threshold Accuracy Over Full

Temperature Range

♦ No External Components Required
♦ Low Cost
♦ 30µA (typ) Supply Current
♦ Factory-Programmed Thresholds from -40°C to

+125°C in 5°C Increments

♦ Open-Drain Outputs (MAX6505/MAX6507),

Push-Pull Outputs (MAX6506/MAX6508)

♦ Pin Selectable +2°C, +10°C Hysteresis

(MAX6507/MAX6508)

♦ Pin Selectable +5°C, +10°C, +20°C, +30°C

T

ALARM

- T

WARN

(MAX6505/MAX6506)

♦ SOT23-6 Package

*To complete the suffix information for the MAX6505/

MAX6506, add P or N for positive or negative trip tempera-
ture, and select an available trip point in degrees centigrade.
For example, the MAX6505UTP055-T describes a MAX6505 in
a SOT23-6 package with a +55°C threshold (Table 3). Contact
the factory for pricing and availability of temperature versions
(minimum order 10,000 pieces).

**To complete the suffix information for MAX6507/MAX6508,

see Table 4.

MAX6505–MAX6508

Dual Trip SOT Temperature Switches

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-1712; Rev 1; 4/00

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

Ordering Information

Selector Guide appears at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

PART

MAX6505UT_ _ _ _-T* -40°C to +125°C 6 SOT23-6

MAX6506UT_ _ _ _-T* -40°C to +125°C 6 SOT23-6

MAX6507UT_ _ _ _-T** -40°C to +125°C 6 SOT23-6

MAX6508UT_ _ _ _-T** -40°C to +125°C 6 SOT23-6

TEMP. RANGE

PIN­PACKAGE

TOP VIEW

WARN

16

(WARN)

GND

S1

( ) ARE FOR MAX6506.

MAX6505

2

MAX6506

34

SOT23-6

5 S0

ALARM
(ALARM)

V

CC

OK

16

(OK)

GND

S0

MAX6507

2

MAX6508

34

SOT23-6

OVER
(OVER)

5 N.C.

V

CC

( ) ARE FOR MAX6508.

MAX6505–MAX6508

Dual Trip SOT Temperature Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.5V to +5.5V, R

PULLUP

= 100kΩ (MAX6505/MAX6507 only), TA= -40°C to +125°C, unless otherwise noted. Typical values

are at T

A

= +25°C and VCC= +5V, unless otherwise noted.) (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.

Supply Voltage (VCCto GND) ..................................-0.3V to +6V

S1, S0 to GND ............................................-0.3V to (V

CC

+ 0.3V)

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

CC

+ 0.3V)

Input/Output Current, All Pins...........................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

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

Operating Temperature Range

(T

MIN

to T

MAX

) ..............................................-40°C to +125°C

Thermal Resistance (Θ

JA

)..............................................115°C/W

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

Maximum Die Temperature..............................................+150°C

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Supply Current I

Temperature Threshold
Accuracy (Note 2)

Delta Temperature
(T

ALARM

-T

WARNING

)

MAX6505/MAX6506

Temperature Threshold
Hysteresis (Note 3)

CC

S0 = S1 = GND

CC

S0 = GND

-40°C to 0 ° C -5.5 ±0.5 5.5

∆T

0°C to +95 ° C -3.5 ±0.5 3.5

TH

+95°C to +125 ° C -4 ±0.5 4

S1 = GND, S0 = GND 5

∆T

S1 = GND, S0 = V

AW

S1 = VCC, S0 = GND 20

S1 = VCC, S0 = V

ALARM (MAX6505/MAX6506) 2

WARN

T

HYST

(MAX6505/MAX6506)

2.5 5.5 V

CC

CC

MAX6505/
MAX6506

MAX6507/
MAX6508

∆TAW = 5°C or
10°C

∆T

= 20°C or

AW

30°C

40 80

30 60

10

30

5

10

µA

°C

°C

°C

S0 = GND 2

S0 = V

CC

10

0.8 x
V

CCLogic Input Levels (S1, S0)

0.8 x
V

CC

V

CC

-1.5

> 2.5V 0.5

Output Voltage High
(MAX6506/MAX6508)

Output Voltage Low V

OK, OVER
(MAX6507/MAX6508)

V

IH

V

IL

I

V

OH

I

OL

I

I

= 500µA, VCC > 2.5V

SOURCE

= 800µA,VCC > 4.5V

SOURCE

= 3.2mA, V

SINK

= 5mA, V

SINK

CC

> 4.5V 0.5

CC

V

0.8

V

V

MAX6505–MAX6508

Dual Trip SOT Temperature Switches

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(V

CC

= +5V, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.5V to +5.5V, R

PULLUP

= 100kΩ (MAX6505/MAX6507 only), TA= -40°C to +125°C, unless otherwise noted. Typical values

are at T

A

= +25°C and VCC= +5V, unless otherwise noted.) (Note 1)

Note 1: 100% production tested at T

A

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

Note 2: T

ALARM

, T

UNDER

, and T

OVER

are factory-programmed temperature trip thresholds from -40°C to +125°C in 5°C increments.

Note 3: Temperature threshold hysteresis is defined as the difference from positive-going temperature thresholds minus the nega-

tive-going temperature thresholds.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Open-Drain Output Leakage
Current

VCC = 5.5V, V
V

= 5.5V (MAX6505)

WARN

V

= 5.5V, VOK = 5.5V,

CC

= 5.5V (MAX6507)

V

OVER

ALARM

= 5.5V,

1

µA

1

SUPPLY CURRENT

vs. TEMPERATURE

50

VCC = +5V

= 100kΩ

R

PULLUP

45

40

35

30

SUPPLY CURRENT (µA)

25

20

-40 -10 5 20-25 35 50 65 80 95 110 125
TEMPERATURE (°C)

MAX6505/8-01

HYSTERESIS vs. TRIP TEMPERATURE

2.5
VCC = +5V

= 100kΩ

R

PULLUP

2.0

1.5

HYSTERESIS (°C)

1.0

0.5

-40 -10 5-25 20 35 50 65 80 95 110 125
TEMPERATURE (°C)

0.1

MAX6505/8-02

0

-0.1

-0.2

-0.3

-0.4

-0.5

TRIP-POINT ERROR (%)

-0.6

-0.7

-0.8

TRIP-POINT ERROR (%)

vs. SUPPLY VOLTAGE

NORMALIZED TO TRIP-POINT
TEMPERATURE AT V

2.5 3.53.0 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)

CC

= +5V

MAX6505/8-03

A

2V/div

B

A: V
B: ALARM VOLTAGE, R

STARTUP AND POWER-DOWN

MAX6505

)

(T < T

TH

100µs/div

PULSE

CC

PULLUP

= 100kΩ

MAX6505/8-04

A

2V/div

B

A: V
B: ALARM VOLTAGE, R

CC

STARTUP DELAY

PULSE

MAX6505

(T > T

TH

100µs/div

PULLUP

)

MAX6505/8-05

= 100kΩ

MAX6505–MAX6508

Dual Trip SOT Temperature Switches

4 _______________________________________________________________________________________

Pin Description

PIN

MAX6505 MAX6506 MAX6507 MAX6508

1-— -— WARN

-— 1-— -— WARN

2 2 2 2 GND Ground

3, 5 3, 5 -— -— S1, S0

NAME FUNCTION

Open-Drain Active-Low Warning Output. WARN goes low
when the die temperature exceeds T
∆T

AW.

Push-Pull Active-High Warning Output. WARN goes high
when the die temperature exceeds T
∆T

AW.

Delta Temperature Select Input. Connect to V
select the difference between T
1 or see Electrical Characteristics).

ALARM

WARN

WARN

and T

= T

= T

CC

WARN

ALARM

ALARM

or GND to

(Table

-

-

-— -— 33S0

4444V

-— -— 5 5 N.C. No Connection. Not internally connected.

-— -— 6-—

-— -— _ 6 OVER

-— -— 1-— OK

-— -— -—

6-— -— -— ALARM

Hysteresis Select Input. Connect to V

for 10°C

CC

hysteresis. Connect to GND for 2°C hysteresis.

CC

OVER

Supply Voltage Input. Bypass VCC to GND with a 0.1µF
ceramic capacitor.

Open-Drain Active-Low Overtemperature Output.

OVER

goes low when the die temperature exceeds the factory­set value of T

OVER

.
Push-Pull Active-High Overtemperature Output. OVER
goes high when the die temperature exceeds the factory-

set value of T

OVER.

Open-Drain Active-High Temperature Sensor Output. OK
goes high impedance when the die temperature is
between the factory-set values of T
When the die temperature is above T
T

, OK goes low.

UNDER

OVER

OVER

and T

or below

UNDER

.

Push-Pull Active-Low Temperature Sensor Output. OK

1

OK

goes low when the die temperature is between the factory­set values of T

OVER

erature is above T

and T

OVER

or below T

. When the die temp-

UNDER

UNDER

, OK goes high.

Open-Drain Active-Low Alarm Output. ALARM goes low
when the die temperature exceeds the factory-set value of

.

T

ALARM

Push-Pull Active-High Alarm Output. ALARM goes high

-— 6-— -— ALARM

when the die temperature exceeds the factory-set value of
T

.

ALARM