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參數(shù)資料
| 型號： | NCP302 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Voltage Detector Series with Programmable Delay |
| 中文描述： | 電壓檢測器系列，具有可編程延遲 |
| 文件頁數(shù)： | 19/26頁 |
| 文件大小： | 191K |
| 代理商： | NCP302 |
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NCP302, NCP303
http://onsemi.com
19
Figure 41. Microprocessor Reset Circuit with Additional Hysteresis
2
1
LSN27T1
3
V
DD
D
Reset Output
Input
R
H
R
L
NCP301
NCP303
GN
GN
D
Reset
V
DD
Microprocessor
5
C
D
Comparator hysteresis can be increased with the addition of
resistor R
H
. The hysteresis equations have been simplified and
do not account for the change of input current I
in
as V
in
crosses
the comparator threshold. The internal resistance, R
in
is simply
calculated using I
in
= 0.26 A at 2.6 V.
V
in
Decreasing:
R
H
R
in
V
th
1
V
DET
V
in
Increasing:
V
th
R
H
R
in
R
L
1
V
DET
V
HYS
V
HYS
= V
in
Increasing V
in
Decreasing
Test Data
V
th
Decreasing
V
th
Increasing
V
HYS
R
H
R
L
ááááááááááááá
á
á
á
á
á
á
ááááááááááááááá
áááá
áááá
áááá
áááá
áááá
áááá
2.70
2.70
2.70
á
á
á
á
á
á
áááá
áááá
áááá
áááá
áááá
áááá
2.88
2.94
3.04
á
á
á
á
á
á
0.135
0.17
0.19
0.21
0.20
0.24
0.28
0.27
0.34
á
á
á
á
á
á
100
100
100
220
220
220
470
470
áá
áá
á
áá
áá
á
6.8
4.3
10
6.8
6.8
Figure 42. Simple Clock Oscillator
LSN27T1
HSN27T1
D
Reset Output
Input
82 k
NCP301
NCP302
GN
C
5.0 V
100 k
C ( F)
f
OSC
(kHz)
I
Q
( A)
0.01
2590
21.77
0.1
490
21.97
1.0
52
22.07
Test Data
5
C
D
2
3
1
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