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NCP300 Datasheet(PDF) 15 Page - ON Semiconductor

No. de Pieza. NCP300
Descripción  Voltage Detector Series
Descarga  25 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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NCP300 Datasheet(HTML) 15 Page - ON Semiconductor

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NCP300, NCP301
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OPERATING DESCRIPTION
The NCP300 and NCP301 series devices are second
generation ultra−low current voltage detectors. Figures 20
and 21 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 1) 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 these device series are specifically designed for
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 25 through Figure 32 shows various application
examples.
Figure 21. Timing Waveforms
Vin
VDET+
VDET−
Input Voltage, Pin 2
Vin
0 V
Reset Output (Active Low), Pin 1
Reset Output (Active High), Pin 1
Vin
0 V
VDET+
VDET−
VDET+
VDET−


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