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參數資料
| 型號： | HD74HCT449 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Octal D-Type Transparent Latches with 3-state Outputs 20-CDIP -55 to 125 |
| 中文描述： | 四。總線收發器與個人的方向控制 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 48K |
| 代理商： | HD74HCT449 |
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
G
BA is high, A outputs are disable, and when
G
AB is high, B outputs are disable.
Features
LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
High Speed Operation: t
pd
(A to B) = 12.5 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 4.5 to 5.5 V
Low Input Current: 1 μA max
Low Quiescent Supply Current: I
CC
(static) = 4 μA max (Ta = 25°C)
Function Table
Enable
G
BA
G
AB
Direction DIR
Operation
H
H
X
Isolation
X
L
H
A data to B bus
L
X
L
B data to A bus
X
H
H
Isolation
H
H :
L
X :
X
L
Isolation
High Level
Low Level
Irrelevant.
:
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相關代理商/技術參數 |
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| HD74HCT574FP-E | 制造商:Renesas Electronics Corporation 功能描述:Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOP |
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