NCP304A Ver la hoja de datos (PDF) - ON Semiconductor
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NCP304A Datasheet PDF : 6 Pages
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NCP304A
4.9
4.8
VDET+
4.7
4.6
VDET−
4.5
4.4
4.3
−50
−25
0
25
50
75
100
TA, AMBIENT TEMPERATURE (°C)
Figure 3. NCP304A Series 4.5 V
Detector Threshold Voltage vs. Temperature
2.0
TA = 25°C
1.5
1.0
0.5
7.0
6.0
5.0
4.0
3.0
2.0
TA = −30°C
1.0
TA = 25°C
TA = 85°C
0
0
1.0
2.0
3.0
4.0
5.0
6.0
Vin, INPUT VOLTAGE (V)
Figure 4. NCP304AL Series 4.5 V
Reset Output Voltage vs. Input Voltage
12
10
TA = −30°C
8.0
TA = 25°C
6.0
4.0
TA = 85°C
2.0
0
0
0
2.0
4.0
6.0
8.0
10
0
1.0
2.0
3.0
4.0
5.0
Vin, INPUT VOLTAGE (V)
Vin, INPUT VOLTAGE (V)
Figure 5. NCP304A Series 4.5 V
Input Current vs. Input Voltage
Figure 6. NCP304AH Series 4.5 V
Reset Output Sink Current vs. Input Voltage
OPERATING DESCRIPTION
The NCP304A is a second generation ultra−low current
voltage detectors. Figures 7 and 8 show a timing diagram
and a typical application. Initially consider that input
voltage Vin is at a nominal level and it is greater than the
voltage detector upper threshold (VDET+), and the reset
output (Pin 3) will be in the high state for active low devices,
or in the low state for active high devices. If there is a power
interruption and Vin becomes significantly deficient, it will
fall below the lower detector threshold (VDET−). This
sequence of events causes the Reset output to be in the low
state for active low devices, or in the high state for active
high devices. After completion of the power interruption,
Vin will again return to its nominal level and become greater
than the VDET+. The voltage detector has built−in hysteresis
to prevent erratic reset operation as the comparator threshold
is crossed.
Although this device is specifically designed for use as a
reset controller in portable microprocessor based systems, it
offers a cost−effective solution in numerous applications
where precise voltage monitoring is required.
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