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HD74HCT449 Datasheet

  • HD74HCT449

  • Quad. Bus Transceivers with Individual Direction Controls

  • 51.09KB

  • 8頁

  • HITACHI

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HD74HCT449
Quad. Bus Transceivers with Individual Direction Controls
Description
The HD74HCT449 has 4 bus transceivers. The device has direction control inputs with individual. And
this control inputs select data transmissible direction.
When
GBA
is high, A outputs are disable, and when
GAB
is high, B outputs are disable.
Features
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LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
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High Speed Operation: t
pd
(A to B) = 12.5 ns typ (C
L
= 50 pF)
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High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 4.5 to 5.5 V
Low Input Current: 1 碌A max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A max (Ta = 25擄C)
Function Table
Enable
GBA
H
X
L
X
H
H :
L :
X :
High Level
Low Level
Irrelevant.
GAB
H
L
X
H
X
Direction DIR
X
H
L
H
L
Operation
Isolation
A data to B bus
B data to A bus
Isolation
Isolation

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