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參數(shù)資料
| 型號： | 935210250118 |
| 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： | 3.90 MM, PLASTIC, MS-012, SOT-109-1, SO-16 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 259K |
| 代理商： | 935210250118 |
Philips Semiconductors
Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13
8
AC CHARACTERISTICS (Continued)
GND = 0 V; tr = tf ≤ 2.5 ns; CL = 50 pF; RL = 1 k
CONDITION
LIMITS
SYMBOL
PARAMETER
WAVEFORM
CONDITION
–40
°C to +85 °C
–40
°C to +125 °C
UNIT
VCC (V)
MIN
TYP1
MAX
MIN
MAX
1.2
10
1000
2.0
5
1000
REXT
External timing resistor
Figure 5
2.7
3
1000
k
3.0 to 3.6
2
1000
4.5 to 5.5
2
1000
3
1.2
3
2.0
CEXT
External timing capacitor
Figure 53
2.7
No limits
pF
3.0 to 3.6
4.5 to 5.5
NOTES:
1. Unless otherwise stated, all typical values are at Tamb = 25 °C.
2. Typical value measured at VCC = 3.3 V.
3. Typical value measured at VCC = 5.0 V.
4. For other REXT and CEXT combinations see Figure 5.
if CEXT > 10 nF, the next formula is valid:
tW
= K
× REXT x CEXT (typ.)
where, tW
= output pulse width in ns;
REXT = external resistor in k; CEXT = external capacitor in pF;
K
= constant = 0.45 for VCC = 5.0 V and 0.48 for VCC = 2.0 V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT.
The output pulse width will only be extended when the time between the active-going edges of the
trigger pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid:
trt
= 30 + 0.19R
× C0.9 + 13 × R1.05 (typ.)
If CEXT > 10 pF, the next formula (at VCC = 3.0 V) for the set-up time of a retrigger pulse is valid:
trt
= 41 + 0.15R
× C0.9 × R1.05 (typ.)
where, trt
= retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in k.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50 pF.
AC WAVEFORMS
VM = 1.5 V at VCC ≥ 2.7 V; VM = 0.5 VCC at VCC t 2.7 V;
VOL and VOH are the typical output voltage drop that occur with the
output load.
tW
trt
tW
nB INPUT
nA INPUT
nQ OUTPUT
SV00139
Figure 1.
Output pulse control using retrigger pulse;
nRD = HIGH.
tW
nB INPUT
nRD INPUT
nQ OUTPUT
SV00140
Figure 2.
Output pulse control using reset input nRD;
nA = LOW.
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