NCP302 ON, NCP302 Datasheet - Page 19

• Manufacturer Part Number: NCP302
• Description: Voltage Detector Series with Programmable Delay
• Manufacturer: ON

Comparator hysteresis can be increased with the addition of
resistor R
do not account for the change of input current I
the comparator threshold. The internal resistance, R
calculated using I
V
V
V
in
in
HYS
Decreasing:
Increasing:
= V
V
H
th
. The hysteresis equations have been simplified and
in
+
Increasing − V
C
in
V
R
th
= 0.26 mA at 2.6 V.
in
R
+
ø R
H
C
5
D
L
R
R
) 1
V
H
in
Figure 41. Microprocessor Reset Circuit with Additional Hysteresis
DD
) 1
HSN27T1
in
LSN27T1
LSN27T1
NCP301
NCP301
NCP302
5.0 V
2
3
Decreasing
V
DET*
100 k
Input
GN
GN
GN
D
D
D
C
V
5
D
DET*
) V
LSN27T1
LSN27T1
LSN27T1
Reset Output
1
NCP301
NCP301
NCP303
in
HYS
3
2
as V
Figure 42. Simple Clock Oscillator
R
Input
GN
GN
GN
D
D
D
in
in
H
is simply
crosses
NCP302, NCP303
82 k
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Reset Output
1
19
V
th
R
Decreasing
L
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
C (mF)
(V)
0.01
0.1
1.0
Reset
Microprocessor
f
Test Data
V
OSC
th
2590
490
52
Increasing
Test Data
(kHz)
2.84
2.87
2.88
2.91
2.90
2.94
2.98
2.70
3.04
3.15
(V)
V
GN
D
DD
I
V
0.135
Q
0.17
0.19
0.21
0.20
0.24
0.28
0.27
0.34
0.35
21.77
21.97
22.07
(V)
HYS
(mA)
100
100
100
220
220
220
470
470
470
(W)
R
0
H
(kW)
6.8
4.3
6.8
4.3
6.8
4.3
R
10
10
10
−
L