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CAT853LTBI-GT3 Datasheet(PDF) 5 Page - ON Semiconductor

Part # CAT853LTBI-GT3
Description  3-Pin Microprocessor Power Supply Supervisors
Download  9 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT853LTBI-GT3 Datasheet(HTML) 5 Page - ON Semiconductor

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CAT853, CAT859, CAT863, CAT869
http://onsemi.com
5
DETAILED DESCRIPTION
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 140 ms after the power supply voltage has risen above the threshold.
5 V
0 V
5 V
0 V
Threshold
Voltage
140 ms
minimum
Reset Timeout Period
Power
Supply
Voltage
Figure 6. Reset Timing Diagram
RESET
VCC Transient Response
The CAT853, CAT863, CAT859, and CAT869 protect
mPs
against brownout failure. Short duration transients of 4
ms 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
“M” THRESHOLD
“C” THRESHOLD
TAMB = 25°C
Valid Reset with VCC under 1.0 V
To ensure that the CAT859 and CAT869 RESET pin is in
a known state when VCC is under 1.0 V, a > 10 kW
pull−down resistor between RESET pin and GND is
recommended.
CAT8x9
GND
Power
Supply
Figure 8. RESET Valid with VCC Under 1.0 V
10 kW
VCC
RESET


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