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CAT859S Datasheet(PDF) 4 Page - Catalyst Semiconductor

No. de pieza CAT859S
Descripción Electrónicos  3-Pin Microprocessor Power Supply Supervisors
Download  9 Pages
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT859S Datasheet(HTML) 4 Page - Catalyst Semiconductor

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CAT853, CAT863, CAT859, CAT869
4
Doc. No. 3026, Rev. B
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5V
0V
5V
0V
Threshold
Voltage
140ms
minimum
Reset Timeout Period
Power
Supply
Voltage
RESET
DETAILED DESCRIPTIONS
RESET TIMING
The reset signal is asserted low for the CAT853, CAT863,
CAT859, and CAT869 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.
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
VCC TRANSIENT RESPONSE
The CAT853, CAT863, CAT859, and CAT869 protect
μPs against brownout failure. Short duration transients
of 4μsec or less and 100mV 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.
Figure 1. Reset Timing Diagram
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).


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