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參數資料
| 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： | 11/20頁 |
| 文件大?。?/td> | 91K |
| 代理商： | HD74LV123A |
HD74LV123A
11
Timing diagram
Caution in use
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 HD74LV123A
because of the amount of energy stored in the capacitor. When a system containing
this device is powered down, the capacitor may discharge from Vcc through the protection
diodes at pin 7 or pin 15.
Current through the input protection diodes must be limited to 20 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)/
20 mA = 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 HD74LV123A may sustain damage.
To avoid this possibility, use an external calmping diode.
A
CLR
B
Q
Q
Rext/
Cext
t
w
t
w
t
rr
t
w
+t
rr
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| HD74LV123AFP-E | 制造商:Renesas Electronics Corporation 功能描述:Logic,74LV Series, SOP16 |
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| HD74LV126AFP | 制造商:Renesas Electronics Corporation 功能描述:Buffer/Line Driver 4-CH Non-Inverting 3-ST CMOS 14-Pin SOP |
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