NCP300 ONSEMI [ON Semiconductor], NCP300 Datasheet - Page 17

• Manufacturer Part Number: NCP300
• Description: Voltage Detector Series
• Manufacturer: ONSEMI [ON Semiconductor]

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
in
V
R
th
= 0.26 mA at 2.6 V.
in
R
+
ø R
H
L
R
R
) 1
in
V
H
Figure 26. Microprocessor Reset Circuit with Additional Hysteresis
DD
) 1
in
Decreasing
5.0 V
3.3 V
V
Figure 25. Dual Power Supply Undervoltage Supervision
DET*
V
DET*
) V
APPLICATION CIRCUIT INFORMATION
LSN27T1
LSN27T1
LSN27T1
NCP301
NCP301
NCP301
in
HYS
3
2
as V
R
Input
GND
in
in
H
is simply
crosses
LSN45T1
LSN30T1
NCP300, NCP301
NCP301
NCP301
http://onsemi.com
2
3
2
3
Reset Output
1
Input
GND
Input
GND
17
Reset Output
Reset Output
1
1
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
(V)
V
supply
Reset
Microprocessor
V
th
Low state output if either power
supply is below the respective
undervoltage detector threshold
but greater than 1.0 V.
Increasing
Test Data
2.84
2.87
2.88
2.91
2.90
2.94
2.98
2.70
3.04
3.15
(V)
GND
V
DD
V
0.135
0.17
0.19
0.21
0.20
0.24
0.28
0.27
0.34
0.35
(V)
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