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參數(shù)資料
| 型號： | 935210280118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 諧振器 |
| 英文描述： | LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, MO-153, SOT-403-1, TSSOP1-16 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 259K |
| 代理商： | 935210280118 |
Philips Semiconductors
Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13
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 k to 100 k.
0
1102
SV00141
10
103
104
102
103
104
105
106
tW
ns
CEXT (pF)
REXT =
100 k
W
50 k
W
10 k
W
2 k
W
Figure 5.
Typical output pulse width as a function of the
external capacitor values at VCC = 3.3 V 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
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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