Single-/Dual-/Triple-Voltage µP Supervisory

Circuits with Independent Watchdog Output

4

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ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

WATCHDOG INPUT

First watchdog period after reset

timeout period

35

54

72

Watchdog Timeout Period

Normal mode

1.12

1.68

2.24

s

WDI Pulse Width

(Note 2)

50

ns

0.3

WDI Input Voltage

0.7

V

WDI Input Current

+1

µA

RESET/WATCHDOG OUTPUT

≥ +0.8V,

0.3

≥ +1.0V,

0.3

≥ +1.2V,

0.3

≥ +2.7V,

0.3

RST / WDO Output Low Voltage

(Push-Pull or Open Drain)

≥ +4.5V,

0.4

V

output not asserted

0.8

output not asserted

0.8

RST / WDO Output High Voltage

(Push-Pull Only)

output not asserted

0.8

V

RST / WDO Output Open-Drain

Leakage Current

Output not asserted

0.5

µA

Note 2: Parameter guaranteed by design.