參數(shù)資料
型號: NCP304
廠商: ON SEMICONDUCTOR
英文描述: Voltage Detector Series(電壓檢測器系列)
中文描述: 電壓檢測器系列(電壓檢測器系列)
文件頁數(shù): 17/23頁
文件大?。?/td> 190K
代理商: NCP304
NCP304, NCP305
http://onsemi.com
17
Figure 29. Microprocessor Reset Circuit with Additional Hysteresis
2
1
LSN27T1
LSQ27T1
4
V
DD
GND
Reset Output
Input
R
H
R
L
NCP301
NCP305
GND
Reset
V
DD
Microprocessor
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:
V
th
R
H
R
in
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
(mV)
V
th
Increasing
(mV)
V
HYS
(mV)
R
H
( )
R
L
(k )
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
áááááááááááááááá
2.70
2.70
2.70
2.70
2.84
2.88
2.94
3.04
0.135
0.19
0.24
0.34
0
100
220
470
-
6.8
6.8
6.8
Figure 30. Simple Clock Oscillator
LSN27T1
HSQ27T1
GND
Reset Output
Input
82 k
NCP301
NCP302
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
2
4
1
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