Microprocessor Supervisory Circuits

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3

MAX691A, MAX800L

mA

7

20

–

RESET Output Short-Circuit

Current

V

3.5

RESET Output Voltage

0.1

0.4

0.004

0.3

ns

100

Minimum Watchdog Input

Pulse Width

Clock

Cycles

1024

Watchdog Timeout Period,

External Clock (Note 4)

4096

ms

70

100

140

Watchdog Timeout Period,

Internal Oscillator

1.0

1.6

2.25

Clock

Cycles

2048

Reset Active Timeout Period,

External Clock (Note 4)

ms

140

200

280

Reset Active Timeout Period,

Internal Oscillator

ns

800

LOW LINE-to-RESET Delay

µs

80

MAX693A, MAX800M

CONDITIONS

mV

15

Reset Threshold Hysteresis

V

4.30

4.45

Reset Threshold Voltage

4.55

4.70

4.25

4.40

4.50

4.50

4.65

4.75

UNITS

MIN

TYP

MAX

PARAMETER

Output source current

Short period

Long period

Short period

Long period

Power-up

Power-up

Power-down

ELECTRICAL CHARACTERISTICS (continued)

unless otherwise noted.)

RESET Output Voltage Low

(Note 5)

0.1

0.4

V

0.4

LOW LINE Output Voltage

3.5

V

LOW LINE Output

Short-Circuit Current

Output source current

1

15

100

µA

0.4

WDO Output Voltage

3.5

V

WDO Output

Short-Circuit Current

Output source current

3

10

mA

WDI Threshold Voltage

(Note 6)

0.8

V

WDI = 0V

-50

-10

WDI Input Current

20

50

µA

sec

mV

60

Battery Switchover

Hysteresis

V

0.7

1.5

BATT ON Output

Low Voltage

0.1

0.4

Source current

µA

1

15

100

BATT ON Output

Short-Circuit Current

Sink current

mA

60

RESET AND WATCHDOG TIMER