CAT803, CAT809, CAT810

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6

Detailed Descriptions

Reset Timing

The reset signal is asserted LOW for the CAT803/CAT809 and HIGH for the CAT810 when the power supply voltage falls below

the threshold trip voltage and remains asserted for at least 140 ms after the power supply voltage has risen above the threshold.

0 V

CAT803, CAT809

5 V

0 V

5 V

RESET

(140 ms

minimum)

Reset Timeout Period

CAT810

0 V

5 V

Figure 6. Reset Timing Diagram

RESET

The CAT803/CAT809/CAT810 protect

mPs against

brownout failure. Short duration transients of 4

msec or less

and 100 mV amplitude typically do not cause a false RESET.

Figure 7 shows the maximum pulse duration of negative−

As the amplitude of the transient goes further below the

voltage of 0.5 V above the threshold and drops below it by

Figure 7. Maximum Transient Duration without

Causing a Reset Pulse vs. Reset Comparator

Overdrive

1000

100

10

1

0

5

10

15

20

25

30

CAT809M

CAT809Z