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TC1278-15ENB Scheda tecnica(PDF) 5 Page - Microchip Technology

Il numero della parte TC1278-15ENB
Spiegazioni elettronici  3-Pin Reset Monitors for 5V Systems
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21384B-page 5
TC1278/TC1279
3.2
VCC Transient Rejection
The TC1278/TC1279 provides accurate VCC monitor-
ing and reset timing during power-up, power-down,
and brownout/sag conditions, and rejects negative-
going transients (glitches) on the power supply line.
Figure 3-5 shows the maximum transient duration vs.
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive
that lays under the curve will not generate a reset
signal. Combinations above the curve are detected as
a brownout or power-down. Transient immunity can be
improved by adding a capacitor in close proximity to the
VCC pin of the TC1278/TC1279.
FIGURE 3-5:
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
RESET COMPARATOR OVERDRIVE,
[V
CCTP - VCC] (mV)
5
3
2
4
1
0
1
5
100
1000
TA
°C
VCCTP
Duration
Overdrive
VCC
TC1278/9


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