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74LV123 Arkusz danych(PDF) 10 Page - NXP Semiconductors

Numer części 74LV123
Szczegółowy opis  Dual retriggerable monostable multivibrator with reset
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74LV123 Arkusz danych(HTML) 10 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74LV123
Dual retriggerable monostable multivibrator
with reset
1998 Apr 28
10
0.8
0.4
0
02
4
VCC (V)
‘K’ factor
SV00185
1
3
6
5
Figure 4. HCT typical “k” factor as a function of VCC;
CX = 10 nF; RX = 10 KW to 100 KW.
0
1102
SV00141
10
103
104
102
103
104
105
106
tW
ns
CEXT (pF)
REXT =
100k
W
50k
W
10k
W
2k
W
Figure 5.Typical output pulse width as a function of the
external capacitor values at VCC = 3.3V and Tamb = 25°C.
APPLICATION INFORMATION
Power-up considerations
When the monostable is powered-up it may produce an output
pulse, with a pulse width defined by the values of RX and CX. This
output pulse can be eliminated using the circuit shown in Figure 6.
SV00152
RX
VCC
A
B
CX
Q
Q
RESET
VCC
nCEXT
nREXT/CEXT
“123”
Figure 6. Power-up output pulse elimination circuit
Power-down considerations
A large capacitor (CX) may cause problems when powering-down
the monostable due to the energy stored in this capacitor. When a
system containing this device is powered-down or a rapid decrease
of VCC to zero occurs, the monostable may sustain damage, due to
the capacitor discharging through the input protection diodes. To
avoid this possibility, connect a damping diode (DX) preferably a
germanium or Schottky type diode able to withstand large current
surges as shown in Figure 7.
VCC
DX
RX
CX
nREXT/CEXT
SV00154
Figure 7. Power-down protection circuit


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