MAX6372 datasheet(4/10 Pages) MAXIM

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Pin-Selectable Watchdog Timers

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-40

-15

SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

VCC = +5.5V

VCC = +2.5V

Typical Operating Characteristics

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)

0.997

0.999

0.998

1.001

1.000

1.002

1.003

-40

-15

WATCHDOG TIMEOUT PERIOD

vs. TEMPERATURE

TEMPERATURE (°C)

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.5V to +5.5V, SET_ = VCC or GND, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and

VCC = +3V.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VSET2 = 0V, VSET1 = 0V, VSET0 = 0V

VSET2 = 0V, VSET1 = 0V, SET0 = VCC

VSET2 = 0V, SET1 = VCC, VSET0 = 0V

VSET2 = 0V, SET1 = VCC, SET0 = VCC

Watchdog Disabled

SET2 = VCC, VSET1 = 0V, VSET0 = 0V

µs

SET2 = VCC, VSET1 = 0V, SET0 = VCC

SET2 = VCC, SET1 = VCC, VSET0 = 0V

Watchdog Timeout

Period

tWD

SET2 = VCC, SET1 = VCC, SET0 = VCC

Watchdog Input Pulse Width

(Note 2)

tWDI

After WDO deasserted

100

MAX6369/MAX6371/MAX6373

100

300

Watchdog Output Pulse Width

tWDO

MAX6370/MAX6372/MAX6374

Internal Setup Time

(Note 4)

tSETUP

After WDO deasserted

100

300

Note 1: Production tested at TA = +25°C. Guaranteed by design over temperature limits.

Note 2: Guaranteed by design.

Note 3: In this setting the watchdog timer is inactive and startup delay ends when WDI sees its first level transition. See the Selecting

Device Timing section for more information.

Note 4: After power-up, or a setting change, there is an internal setup time during which WDI is ignored.

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