3

SP791DS/08

SP791 Low Power Microprocessor Supervisory with Battery Switch-Over

© Copyright 2000 Sipex Corporation

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

MIN

TYP

MAX

UNITS

CONDITIONS

BATT ON Output

0.1

0.4

V

I

Low Voltage

0.7

1.5

I

BATT ON Output

60

mA

Sink Current

Short Circuit Current

1

15

100

µA

Source Current

RESET, LOW-LINE AND WATCHDOG TIMER

RESET Threshold Voltage

4.50

4.65

4.75

V

RESET Threshold Hysteresis

15

mV

LOWLINE-to-RESET

150

mV

Threshold Voltage

100

µs

Power down

80

µs

Power down

RESET Active Timeout Period

140

200

280

ms

Power up

Watchdog Timeout Period

1.0

1.6

2.25

sec

SWT connected to V

OUT

Minimum Watchdog

10

ms

4.7nF capacitor connected from

Timeout Period

SWT to GND

Minimum Watchdog Input

100

ns

V

Pulse Width

WDPO Pulse Width

1

ms

WDPO-to-WDO Delay

70

ns

RESET Output Voltage

0.004

0.3

V

I

Ä

0.1

0.4

I

3.5

I

RESET Output

Short-Circuit Current

7

20

mA

Output source current

LOWLINE Output Voltage

0.4

V

I

3.5

I

LOWLINE Output

15

100

µA

Output source current

Short-Circuit Current

WDO Output Voltage

0.4

V

I

3.5

I

WDO Output Short-Circuit

3

10

mA

Output source currrent

Current

WDPO Output Voltage

0.4

V

I

3.5

I

WDPO Output Short-Circuit

7

20

mA

Output source current

Current