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CAT812STBIT10 Datasheet(PDF) 6 Page - Catalyst Semiconductor

Part # CAT812STBIT10
Description  4-Pin Microprocessor Power Supply Supervisors with Manual Reset
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT812STBIT10 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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CAT811, CAT812
6
Doc. No. 3005, Rev. R
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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.
Figure 1. Reset Timing Diagram
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
30
25
20
15
10
5
0
RESET OVERDRIVE VTH - VCC [mV]
1
10
100
1000
TAMB = 25°C
CAT8xxM
CAT8xxZ
5V
0V
5V
0V
5V
0V
CAT811
CAT812
Threshold
Voltage
140ms
minimum
Reset Timeout Period
Power
Supply
Voltage
RESET
RESET
VCC TRANSIENT RESPONSE
The CAT811/812 protect
µPs against brownout failure.
Short duration transients of 4
µsec 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).


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