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74VHC123AM 数据表(PDF) 3 Page - Fairchild Semiconductor

部件名 74VHC123AM
功能描述  Dual Retriggerable Monostable Multivibrator
Download  14 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74VHC123AM 数据表(HTML) 3 Page - Fairchild Semiconductor

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©1993 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74VHC123A Rev. 1.2
3
Block Diagrams
Note A: Cx, Rx, Dx are external Capacitor, Resistor, and Diode, respectively.
Note B: External clamping diode, Dx;
External capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied.
If the supply voltage is turned off, Cx discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large
and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the
capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically
limited and damage to the IC is avoided.
The maximum value of forward current through the parasitic diode is ±20mA. In the case of a large Cx, the limit of fall
time of the supply voltage is determined as follows:
tf ≥ (VCC –0.7) Cx / 20mA
(tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC)
In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC
from rush current.


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