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MC14538BDW データシート(PDF) 9 Page - ON Semiconductor

部品番号 MC14538BDW
部品情報  Dual Precision Retiggerable/Resettable Monostable Multivibrator
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC14538BDW データシート(HTML) 9 Page - ON Semiconductor

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MC14538B
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9
POWER–DOWN CONSIDERATIONS
Large capacitance values can cause problems due to the
large amount of energy stored. When a system containing
the MC14538B is powered down, the capacitor voltage may
discharge from VDD through the standard protection diodes
at pin 2 or 14. Current through the protection diodes should
be limited to 10 mA and therefore the discharge time of the
VDD supply must not be faster than (VDD). (C)/(10 mA).
For example, if VDD = 10 V and CX = 10 µF, the VDD supply
should discharge no faster than (10 V) x (10
µF)/(10 mA)
= 10 ms. This is normally not a problem since power
supplies are heavily filtered and cannot discharge at this rate.
When a more rapid decrease of VDD to zero volts occurs,
the MC14538B can sustain damage. To avoid this possibility
use an external clamping diode, DX, connected as shown in
Fig. 11.
Figure 11. Use of a Diode to Limit
Power Down Current Surge
VSS
Dx
VDD
VDD
Rx
Cx
Q
Q
RESET
Figure 12. Retriggerable
Monostables Circuitry
Figure 13. Non–Retriggerable
Monostables Circuitry
CX
RX
VDD
Q
Q
RESET = VDD
B = VDD
A
B
RISING–EDGE
TRIGGER
CX
RX
VDD
Q
Q
RESET = VDD
B
A = VSS
FALLING–EDGE
TRIGGER
CX
RX
VDD
Q
Q
A
B
RESET = VDD
CX
RX
VDD
Q
Q
RESET = VDD
A
B
FALLING–EDGE
TRIGGER
RISING–EDGE
TRIGGER
NC
NC
NC
VDD
VDD
A
B
Figure 14. Connection of Unused Sections
Q
Q
CD
TYPICAL APPLICATIONS


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