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參數資料
| 型號： | HD74HC221 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual Monostable Multivibrators (with Schmitt Trigger Input) |
| 中文描述： | 雙（與施密特觸發輸入單穩態多頻振蕩器） |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HD74HC221 |
HD74HC221
Dual Monostable Multivibrators (with Schmitt Trigger Input)
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit. Also included is a clear inpt that when taken low resets the one shot. The
HD74HC221 can be triggered on the positive transition of teh clear while A is held low and B is held high.
This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
The output pulse equation is simply:
t
W
= 0.7·(Rext)·(Cext)
Features
High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 μA max
Low Quiescent Supply Current
Function Table
Inputs
Outputs
Clear
A
B
Q
Q
L
X
X
L
H
X
H
X
L
H
X
X
L
L
H
H
L
H
H
L
H
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