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NCP300 Datasheet(PDF) 16 Page - ON Semiconductor

No. de pieza NCP300
Descripción Electrónicos  Voltage Detector Series
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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NCP300 Datasheet(HTML) 16 Page - ON Semiconductor

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NCP300, NCP301
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VCC TRANSIENT REJECTION
The NCP300 and NCP301 series provides accurate VCC
monitoring
and
reset
timing
during
power−up,
power−down, and brownout/sag conditions, and rejects
negative glitches on the power supply line. Figure 22 shows
the maximum transient duration vs. maximum negative
excursion (overdrive) for glitch rejection. Any combination
of duration and overdrive which lies under the curve will not
generate a reset signal. A below−VCC condition (on the
right) is detected as a brownout or power−down. Typically,
any transient that goes 100 mV below the reset threshold and
lasts 5.0
ms or less will not cause a reset pulse.
Transient immunity can be improved by adding a
capacitor in close proximity to the VCC pin of the NCP30x.
VCC
VTH
Duration
Overdrive
Figure 22. Max Transient Duration vs. Max Overdrive
Figure 23.
RESET COMPARATOR OVERDRIVE
300
250
200
150
100
50
0
150
130
110
90
70
50
30
10
VTH = 4.90 V
VTH = 3.10 V
VTH = 1.60 V
PROPAGATION DELAY VARIATION
On the other hand (see above paragraph), a minimum
overdrive value from Vthreshold to VCC must be respected.
That means Vin (minimum value of VCC) must be higher
enough than VDET+ (VDET− + hysteresis) at the risk of
significantly increasing propagation delay. (Figure 24) This
propagation delay is temperature sensitive.
To avoid acceptable time response, a minimum 100 mV
difference between Vin and VDET+ must be selected.
Figure 24. tpLH and tpHL vs. Input Voltage
for the NCP301SNT1
tpLH
tpHL
5.0
4.5
4.0
3.5
5.5
VDET+
100
0
300
200
500
400
600
3.0
3.168
Vin, PULSE HIGH INPUT VOLTAGE (V)


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