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CAT809STBI-GT3 Datasheet(PDF) 6 Page - ON Semiconductor

Part # CAT809STBI-GT3
Description  3-Pin Microprocessor Power Supply Supervisors
Download  11 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT809STBI-GT3 Datasheet(HTML) 6 Page - ON Semiconductor

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CAT803, CAT809, CAT810
http://onsemi.com
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
TR
TD
VTH
VCC
RESET
VCC Transient Response
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−
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 0.5 V above the threshold and drops below it by
the amplitude of the overdrive voltage (VTH − VCC).
Figure 7. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
RESET OVERDRIVE VTH − VCC (mV)
1000
100
10
1
0
5
10
15
20
25
30
CAT809M
CAT809Z
TAMB = 25°C


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