MAX6501(2011) データシートの表示（PDF） - Maxim Integrated

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MAX6501
(Rev.:2011)

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

Maxim Integrated 

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

Temperature Switches in SOT23

PIN

MAX6501 MAX6502 MAX6503 MAX6504

NAME

1, 2

1, 2

1, 2

1, 2

GND

3

3

3

3

HYST

4

4

4

4

VCC

5

—

—

—

TOVER

—

5

—

—

TOVER

—

—

5

—

TUNDER

—

—

—

5

TUNDER

Pin Description

FUNCTION

Ground. Not internally connected. Connect both ground pins

together close to the chip. Pin 2 provides the lowest thermal

resistance to the die.

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

connect to VCC for 10°C hysteresis.

Supply Input (+2.7V to +5.5V)

Open-Drain, Active-Low Output. TOVER goes low when the die

temperature exceeds the factory-programmed temperature

threshold. Connect to a 100kΩ pullup resistor. May be pulled

up to a voltage higher than VCC.

Push-Pull Active-High Output. TOVER goes high when the die tem-

perature exceeds the factory-programmed temperature threshold.

Open-Drain, Active-Low Output. TUNDER goes low when the

die temperature goes below the factory-programmed tempera-

ture threshold. Connect to a 100kΩ pullup resistor. May be

pulled up to a voltage higher than VCC.

Push-Pull Active-High Output. TUNDER goes high when the die tem-

perature falls below the factory-programmed temperature threshold.

________________General Description

The MAX6501–MAX6504 fully integrated temperature

switches incorporate two temperature-dependent refer-

ences and a comparator. One reference exhibits a pos-

itive 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 active-low, open-

drain output structure that can only sink current. The

MAX6502/MAX6504 have an active-high, push-pull out-

put structure that can sink or source current. The inter-

nal power-on reset circuit guarantees the output is at

TTH = +25°C state at startup for 50µs.

The MAX6501–MAX6504 are available with factory-

preset temperature thresholds from -45°C to +125°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).

Table 1. Factory-Programmed Threshold

Range

PART

MAX6501

MAX6502

MAX6503

MAX6504

THRESHOLD (TTH) RANGE

+35°C < TTH < +125°C

+35°C < TTH < +125°C

-45°C < TTH < +15°C

-45°C < TTH < +15°C

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 pre-

vents the output from oscillating when the temperature

approaches the trip point. The HYST pin should not be

left unconnected. 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).

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