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54F646LCX Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 54F646LCX
Descripción Electrónicos  Octal Transceiver/Register with TRI-STATE Outputs
Download  12 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F646LCX Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
A0–A7
Data Register A Inputs
351083
70 mA b650 mA
TRI-STATE Outputs
6001066 (80) b12 mA64 mA (48 mA)
B0–B7
Data Register B Inputs
351083
70 mA b650 mA
TRI-STATE Outputs
6001066 (80) b12 mA64 mA (48 mA)
CPAB CPBA Clock Pulse Inputs
1010
20 mA b06 mA
SAB SBA
Select Inputs
1010
20 mA b06 mA
G
Output Enable Input
1010
20 mA b06 mA
DIR
Direction Control Input
1010
20 mA b06 mA
Function Table
Inputs
Data IO
Function
G
DIR
CPAB
CPBA
SAB
SBA
A0–A7
B0–B7
H
X
H or L
H or L
X
X
Isolation
HX
L
X
X
X
Input
Input
Clock An Data into A Register
HX
X
L
X
X
Clock Bn Data into B Register
LH
X
X
L
X
An to Bn Real Time (Transparent Mode)
LH
L
XL
X
Input
Output
Clock An Data into A Register
L
H
H or L
X
H
X
A Register to Bn (Stored Mode)
LH
L
X
H
X
Clock An Data into A Register and Output to Bn
LL
X
X
X
L
Bn to An Real Time (Transparent Mode)
LL
X
L
XL
Output
Input
Clock Bn Data into B Register
L
L
X
H or L
X
H
B Register to An (Stored Mode)
LL
X
L
X
H
Clock Bn Data into B Register and Output to An
The data output functions may be enabled or disabled by various signals at the G and DIR Inputs Data input functions are always enabled ie data at the bus
pins will be stored on every LOW-to-HIGH transition of the clock inputs
H e HIGH Voltage Level
L e LOW Voltage Level
X e Irrelevant
L e LOW-to-HIGH Transition
3


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