CAT811JEUSGT10 データシートの表示（PDF） - Catalyst Semiconductor => Onsemi

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CAT811JEUSGT10

4-Pin Microprocessor Power Supply Supervisors with Manual Reset

Catalyst Semiconductor => Onsemi 

CAT811, CAT812

DETAILED DESCRIPTIONS

RESET TIMING

The reset signal is asserted LOW for the CAT811 and

HIGH for the CAT812 when the power supply voltage

falls below the threshold trip voltage and remains asserted

for at least 140ms after the power supply voltage has

risen above the threshold.

Power 5V

Supply

Voltage 0V

5V

RESET

0V

5V

RESET

0V

Threshold

Voltage

Reset Timeout Period

140ms

minimum

CAT811

CAT812

Figure 1. Reset Timing Diagram

VCC TRANSIENT RESPONSE

The CAT811/812 protect µPs against brownout failure.

Short duration transients of 4µsec or less and 100 mV

amplitude typically do not cause a false RESET.

Figure 2 shows the maximum pulse duration of negative-

going VCC transients that do not cause a reset condition.

As the amplitude of the transient goes further below the

threshold (increasing VTH - VCC), the maximum pulse

duration decreases. In this test, the VCC starts from an

initial voltage of 0.5V above the threshold and drops

below it by the amplitude of the overdrive voltage (VTH

- VCC).

30

25

TAMB = 25°C

20

15

CAT8xxZ

10

5

CAT8xxM

0

1

10

100

1000

RESET OVERDRIVE VTH - VCC [mV]

Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive

Doc. No. 3005, Rev. R

6

© 2005 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

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