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參數(shù)資料
| 型號： | HD74LV123A |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual Retriggerable Monostable Multivibrators |
| 中文描述： | 雙Retriggerable單穩(wěn)態(tài)多頻振蕩器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 91K |
| 代理商： | HD74LV123A |
HD74LV123A
Dual Retriggerable Monostable Multivibrators
ADE-205-258A (Z)
2nd Edition
June 1999
Description
The HD74LV123A features output pulse-duration control by three methods. In the first method, the A
input is low and the B input goes high. In the second method, the B input is high and the
A
input goes low.
In the third method, the
A
input is low, the B input is high, and the clear (
CLR
) input goes high.
The basic pulse duration is programmed by selecting external resistance and capacitance values.
The external timing capacitor must be connected between Cext and Rext/Cext (positive) and an external
resistor connected between Rext/Cext and Vcc
To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and Vcc.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (
A
) or
high-level-active (B) input. Pulse duration can be reduced by taking
CLR
low.
Features
V
CC
= 2.0 V to 5.5 V operation
All inputs V
IH
(Max.) = 5.5 V (@V
CC
= 0 V to 5.5 V)
All outputs V
O
(Max.) = 5.5 V (@V
CC
= 0 V)
Output current
±
6 mA (@V
CC
= 3.0 V to 3.6 V),
±
12 mA (@V
CC
= 4.5 V to 5.5 V)
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