+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

_______________________________________________________________________________________

3

10,000

0

0.001

0.01

0.1

1

10

100

1000

RESET TIMEOUT PERIOD

1

10

100

1000

10,000

0

0.001

0.01

0.1

1

10

100

1000

EXTENDED-MODE

1

10

100

1000

10,000

0.1

0.001

0.01

0.1

1

10

100

1000

NORMAL-MODE

(WDS = GND)

1

10

100

1000

CONDITIONS

30

WDI Pulse Width

WDI, WDS Input Threshold

60

ns

ms

V

WDI, WDS Leakage Current

Extended mode disabled

±1

µA

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

WDI Sink/Source Current

(Note 4)

Extended mode enabled

±70

µA

2.8

4.0

5.2

Watchdog Timeout Period

(Note 3)

1.4

2.0

2.6

sec

ELECTRICAL CHARACTERISTICS (continued)

WATCHDOG TIMER

Note 3: Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes

must have low leakage consistent with these currents to prevent timing errors.

__________________________________________Typical Operating Characteristics