NCP304 ON, NCP304 Datasheet - Page 15

• Manufacturer Part Number: NCP304
• Description: Voltage Detector Series
• Manufacturer: ON

generation ultra−low current voltage detectors. Figures 25
and 26 show a timing diagram and a typical application.
Initially consider that input voltage V
and it is greater than the voltage detector upper threshold
(V
for active low devices, or in the low state for active high
devices. If there is a power interruption and V
significantly deficient, it will fall below the lower detector
threshold (V
output to be in the low state for active low devices, or in the
The NCP304 and NCP305 series devices are second
DET+
), and the reset output (Pin 1) will be in the high state
Reset Output (Active High), Pin 1
Reset Output (Active Low), Pin 1
DET−
OPERATING DESCRIPTION
). This sequence of events causes the Reset
Input Voltage, Pin 2
in
is at a nominal level
V
V
V
Figure 25. Timing Waveforms
V
V
V
DET
DET
DET
DET−
DET−
DET−
in
0 V
0 V
V
V
V
becomes
in
in
in
+
+
+
NCP304, NCP305
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15
high state for active high devices. After completion of the
power interruption, V
and become greater than the V
has built−in hysteresis to prevent erratic reset operation as
the comparator threshold is crossed.
use as reset controllers in portable microprocessor based
systems, they offer a cost−effective solution in numerous
applications where precise voltage monitoring is required.
Figure 26 through Figure 32 shows various application
examples.
Although these device series are specifically designed for
in
will again return to its nominal level
DET+
. The voltage detector