74VHC221AM_07 datasheet(2/12 Pages) FAIRCHILD

Nome de Peças	74VHC221AM

Descrição Electrónicos	Dual Non-Retriggerable Monostable Multivibrator

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Fabricante Electrônico	FAIRCHILD [Fairchild Semiconductor]

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74VHC221A Rev. 1.2

2

Connection Diagram

Logic Symbol

IEEE/IEC

Truth Table

H

= HIGH Voltage Level

L

= LOW Voltage Level

= HIGH-to-LOW Transition

= LOW-to-HIGH Transition

X = Don’t Care

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 possibil-

ity 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 para-

sitic diode is ±20 mA. 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 condi-

tion, an external clamping diode (Dx) is needed to

protect the IC from rush current.

Inputs

Outputs

Function

A

B

CLR

QQ

HH

Output Enable

X

LHL

H

Inhibit

HX

HL

H

Inhibit

LH

Output Enable

LH

Output Enable

XX

LL

H

Reset

Nº de peça semelhante - 74VHC221AM_07

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Fairchild Semiconductor	74VHC221AMTC	100Kb / 9P	Dual Non-Retriggerable Monostable Multivibrator
	74VHC221AMTC	464Kb / 12P	Dual Non-Retriggerable Monostable Multivibrator
	74VHC221AMX	464Kb / 12P	Dual Non-Retriggerable Monostable Multivibrator

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Descrição semelhante - 74VHC221AM_07

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Fairchild Semiconductor	74VHC221AMX	464Kb / 12P	Dual Non-Retriggerable Monostable Multivibrator
	MM74HC221A	120Kb / 9P	Dual Non-Retriggerable Monostable Multivibrator
	74VHC221A	100Kb / 9P	Dual Non-Retriggerable Monostable Multivibrator
	MM74HC221A	108Kb / 9P	Dual Non-Retriggerable Monostable Multivibrator
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

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74VHC221AM Folha de dados(PDF) 2 Page - Fairchild Semiconductor

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Nº de peça semelhante - 74VHC221AM_07

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