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參數(shù)資料
| 型號(hào)： | HD74LV221A |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual Monostable Multivibrators(雙單穩(wěn)態(tài)多諧振蕩器) |
| 中文描述： | 雙單穩(wěn)態(tài)多頻振蕩器（雙單穩(wěn)態(tài)多諧振蕩器） |
| 文件頁(yè)數(shù)： | 1/19頁(yè) |
| 文件大?。?/td> | 88K |
| 代理商： | HD74LV221A |
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HD74LV221A
Dual Monostable Multivibrators
ADE-205-271A (Z)
2nd Edition
June 1999
Description
The HD74LV221A 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 V
CC
.
To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and VCC.
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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