參數(shù)資料
型號(hào)： CAT812JTBIT10
廠商： ON SEMICONDUCTOR
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4
封裝： GREEN, TO-253, SOT-143, 4 PIN
文件頁(yè)數(shù)： 8/11頁(yè)
文件大小： 154K
代理商： CAT812JTBIT10
CAT811, CAT812
Doc. No. MD-3005 Rev. V
6
2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
DETAILED DESCRIPTION
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
VCC TRANSIENT RESPONSE
The CAT811/812 protect Ps against brownout
failure. Short duration transients of 4s 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.
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
20
15
10
5
0
TRANS
IE
N
TDUR
ATI
O
N
(m
s)
RESET OVERDRIVE VTH - VCC (mV)
1
10
100
1000
TAMB = 25°C
CAT8xxM
CAT8xxZ
Figure 2. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
5V
0V
5V
0V
5V
0V
CAT811
CAT812
Threshold
Voltage
140ms
minimum
Reset Timeout Period
Power
Supply
Voltage
RESET
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