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參數(shù)資料
| 型號(hào)： | 74LV423PWDH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 諧振器 |
| 英文描述： | Dual retriggerable monostable multivibrator with reset |
| 中文描述： | LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封裝： | PLASTIC, TSSOP1-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 156K |
| 代理商： | 74LV423PWDH |
Philips Semiconductors
Preliminary specification
74LV423
Dual retriggerable monostable multivibrator
with reset
1997 Feb 04
10
0.8
0.4
0
0
2
4
V
CC
(V)
‘K’ factor
SV00185
1
3
6
5
Figure 5. HCT typical “k” factor as a function of V
CC
;
C
X
= 10 nF; R
X
= 10 k to 100 k .
0
1
10
2
SV00141
10
10
3
10
4
10
2
10
3
10
4
10
5
10
6
t
W
ns
C
EXT
(pF)
R
=
100k
50k
10k
2k
Figure 6. Typical output pulse width as a function of the
external capacitor values at V
CC
= 3.3V and T
amb
= 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 R
X
and C
X
, this
output pulse can be eliminated using the circuit shown in Figure 7.
SV00166
R
X
V
CC
A
B
C
X
Q
Q
RESET
V
CC
nC
EXT
nR
EXT
/C
EXT
“423”
Figure 7. Power-up output pulse elimination circuit
Power-down considerations
A large capacitor (C
X
) may cause problems when powering-down
the monostable due to the energy stored in this capacitor. When a
system containing this device is power-down or a rapid decrease of
V
CC
to zero occurs, the monostable may sustain damage, due to the
capacitor discharging through the input protection diodes. To avoid
this possibility, use a damping diode (D
X
) preferably a germanium or
Schottky type diode able to withstand large current surges and
connect as shown in Figure 8.
V
CC
D
X
R
X
C
X
nR
EXT
/C
EXT
SV00154
Figure 8. Power-down protection circuit
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