74VHC123AMX datasheet(3/14 Pages) FAIRCHILD

部品番号	74VHC123AMX

部品情報	Dual Retriggerable Monostable Multivibrator

Download	14 Pages

Scroll/Zoom	100%

メーカー	FAIRCHILD [Fairchild Semiconductor]

ホームページ	http://www.fairchildsemi.com

Logo

3 / 14 page

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.

同様の部品番号 - 74VHC123AMX

メーカー	部品番号	データシート	部品情報
Fairchild Semiconductor	74VHC123AM	107Kb / 9P	Dual Retriggerable Monostable Multivibrator
	74VHC123AM	468Kb / 14P	Dual Retriggerable Monostable Multivibrator
	74VHC123AM	469Kb / 14P	Dual Retriggerable Monostable Multivibrator
ON Semiconductor	74VHC123AM	467Kb / 16P	Dual Retriggerable Monostable Multivibrator May 2007 Rev. 1.2
Fairchild Semiconductor	74VHC123AMTC	107Kb / 9P	Dual Retriggerable Monostable Multivibrator

メーカー	部品番号	データシート	部品情報
STMicroelectronics	M74HC123	503Kb / 12P	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
Toshiba Semiconductor	TC74HC423AP	435Kb / 9P	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
Fairchild Semiconductor	MM74HC423A	108Kb / 10P	Dual Retriggerable Monostable Multivibrator
Toshiba Semiconductor	TC74HC4538AP	477Kb / 10P	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
Fairchild Semiconductor	MM74HC123A	133Kb / 10P	Dual Retriggerable Monostable Multivibrator
Fairchild Semiconductor	74VHC123A	468Kb / 14P	Dual Retriggerable Monostable Multivibrator
Toshiba Semiconductor	TC74HC123AP	505Kb / 14P	Dual Retriggerable Monostable Multivibrator
National Semiconductor ...	MM54HC123A	198Kb / 6P	Dual Retriggerable Monostable Multivibrator
Microsemi Corporation	TSC347	600Kb / 4P	Dual Retriggerable Monostable Multivibrator
ON Semiconductor	74VHC123A	467Kb / 16P	Dual Retriggerable Monostable Multivibrator May 2007 Rev. 1.2
Fairchild Semiconductor	74VHC123ASJX	469Kb / 14P	Dual Retriggerable Monostable Multivibrator