NCP304 ON, NCP304 Datasheet - Page 17

• Manufacturer Part Number: NCP304
• Description: Voltage Detector Series
• 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
+
C
Increasing − V
in
V
R
th
= 0.26 mA at 2.6 V.
in
R
+
ø R
H
L
R
R
) 1
HSQ27T1
LSN27T1
LSN27T1
in
NCP301
NCP301
NCP302
V
H
Figure 29. Microprocessor Reset Circuit with Additional Hysteresis
3
DD
5.0 V
2
) 1
in
Decreasing
V
100 k
Input
GN
GN
D
D
DET*
V
DET*
) V
Reset Output
1
LSN27T1
LSN27T1
LSQ27T1
NCP301
NCP301
NCP305
in
HYS
3
2
as V
Figure 30. Simple Clock Oscillator
R
Input
GN
GN
GN
D
D
D
in
in
H
is simply
crosses
82 k
NCP304, NCP305
http://onsemi.com
Reset Output
1
17
V
th
C (mF)
R
Decreasing
0.01
0.1
1.0
L
(mV)
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
Reset
f
Test Data
OSC
Microprocessor
2590
V
490
52
th
(kHz)
Increasing
Test Data
(mV)
2.84
2.87
2.88
2.91
2.90
2.94
2.98
2.70
3.04
3.15
V
GN
D
DD
I
Q
21.77
21.97
22.07
(mA)
V
0.135
(mV)
0.17
0.19
0.21
0.20
0.24
0.28
0.27
0.34
0.35
HYS
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