HD74HCT449 查看數據表（PDF） - Hitachi -> Renesas Electronics
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HD74HCT449 Datasheet PDF : 8 Pages
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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
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (A to B) = 12.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Enable
GBA
H
X
L
X
H
H : High Level
L : Low Level
X : 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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