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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)： | 10/19頁(yè) |
| 文件大?。?/td> | 88K |
| 代理商： | HD74LV221A |
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HD74LV221A
10
Timing diagram
In order to prevent any malfunctions due to noise, connect a high frequency performance capacitor
between Vcc and GND, and keep the wiring between the external components and Cext, Rext/Cext
pins as short as possible.
Large values of Cext may cause problems when powering down the HD74LV221A because of the amount
of energy stored in the capacitoe. When a system containing diodes at pin 7 or pin15.
Current through the input protection diodes must be limited to 10 mA; therefore, the turn-off time of the Vcc
power supply must not be faster than t = Vcc Cext/(20 mA). for example, if Vcc 5 V and Cext = 22
μ
F,
the Vcc supply must turn off no faster than t = (5 V) (22
μ
F)/20mA = 5.5 ms. This is usually not a problem
because power supplies are heavily filtered and cannot discharge at this rate.
When a more rapid decrease of Vcc to zero volts occurs, the HD74LV221A may sustain damage. To avoid
this possibility, use an external calmping diode.
Caution in use
A
B
CLR
Rext/
Cext
Q
Q
t
w
t
w
t
w
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