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參數資料
| 型號： | MM74HC123A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual Retriggerable Monostable Multivibrator(雙通道可再觸發的單穩態多諧振蕩器) |
| 中文描述： | 雙Retriggerable單穩態觸發器（雙通道可再觸發的單穩態多諧振蕩器） |
| 文件頁數： | 4/6頁 |
| 文件大小： | 198K |
| 代理商： | MM74HC123A |
Logic Diagram
TL/F/5206–5
Theory of Operation
TL/F/5206–6
j
POSITIVE EDGE TRIGGER
m
POSITIVE EDGE RE-TRIGGER (PULSE LENGTHENING)
k
NEGATIVE EDGE TRIGGER
n
RESET PULSE SHORTENING
l
POSITIVE EDGE TRIGGER
o
CLEAR TRIGGER
FIGURE 1
TRIGGER OPERATION
As shown in Figure 1 and the logic diagram before an input
trigger occurs, the one shot is in the quiescent state with the
Q output low, and the timing capacitor C
EXT
completely
charged to V
CC
. When the trigger input A goes from V
CC
to
GND (while inputs B and clear are held to V
CC
) a valid trig-
ger is recognized, which turns on comparator C1 and N-
channel transistor N1
j
. At the same time the output latch
is set. With transistor N1 on, the capacitor C
EXT
rapidly dis-
charges toward GND until V
REF1
is reached. At this point
the output of comparator C1 changes state and transistor
N1 turns off. Comparator C1 then turns off while at the
same time comparator C2 turns on. With transistor N1 off,
the capacitor C
EXT
begins to charge through the timing re-
4
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| MM54HC123AJ | Dual Retriggerable Monostable Multivibrator |
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| MM74HC137J | 3-to-8 Line Decoder With Address Latches (Inverted Output) |
| MM74HC137N | 3-to-8 Line Decoder With Address Latches (Inverted Output) |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74HC123A_01 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Dual Retriggerable Monostable Multivibrator |
| MM74HC123AJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Retriggerable Monostable Multivibrator |
| MM74HC123AM | 功能描述:單穩態多諧振蕩器 DualMultivibrator RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MM74HC123AM | 制造商:Fairchild Semiconductor Corporation 功能描述:IC 74HC CMOS SMD 74HC123 SOIC16 |
| MM74HC123AM_Q | 功能描述:單穩態多諧振蕩器 DualMultivibrator RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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