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74ABT3284VJG датащи(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали 74ABT3284VJG
подробное описание детали  18-Bit Synchronous Datapath Multiplexer
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

74ABT3284VJG датащи(HTML) 3 Page - National Semiconductor (TI)

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Function Tables
Output Enable Control Table
Inputs
Outputs
Control
Mode
Function
OE (A B C D X Y)
MODE
SO
CP
IN
Port
A B C D X Y
L
L
X
ENABLE
ASYNC
ENABLED OUTPUT IO input always active
H
L
X
DISABLE
ASYNC
DISABLED OUTPUT IO input always active
(Notes 2 3)
H (Note 1)
L
(Note 3)
SYNC
(Note 3)
Note 1
Low to High transitions of MODE
SO must be immediately preceeded by a low to high transition (clock edge) on CP
IN while holding Synchronous
Control Inputs OE (A B C D X Y) steady to preset internal registers and assure predictable operation during the control mode change from asynchronous to
synchronous
Note 2
OE (A B C D X Y) levels are synchronously asserted by the positive transition of CP
IN when MODE
SO is high
Note 3
Synchronous Control Mode Functions are same as Asynchronous at time T a 1ofCP
IN
A Side Data Path Select Function Table
Inputs
Data Path
Control
Mode
Function
ASEL(1)
ASEL(0)
MODE
SC
CP
IN
From
To
RegPort
Port
L
L
L
X
(A B C D) IR
A B C D
ASYNC
Readback Contents of Input Register
(A B C D) IR to Port (A B C D)
L
H
L
X
(A B C D) OR
A B C D
ASYNC
Clocked Path Contents of Output
Register (A B C D) OR to Port (A B
C D)
H
L
L
X
Port X
A B C
D
ASYNC
Transparent Path Port X to Port A B
C
D
H
H
L
X
Port X
A
C
ASYNC
Transparent Path Port X to Port A
C
Port Y
B
D
Transparent Path Port Y to Port B
D
(Notes 2 3)
(Notes 2 3)
H (Note 1)
L
(Note 3)
(Note 3)
SYNC
(Note 3)
Note 1
Low to High transitions of MODE
SC must be immediately preceeded by a low to high transition (clock edge) on CP
IN while holding Synchronous
Control Inputs ASEL(0) and ASEL(1) steady to preset internal registers and assure predictable operation during the control mode change from asynchronous to
synchronous
Note 2
ASEL(0) and ASEL(1) levels are synchronously asserted by the positive transition of CP
IN when MODE
SC is high
Note 3
Synchronous Control Mode Functions are same as Asynchronous at time T a 1ofCP
IN
Input Register Control Table
Inputs
Register
Control
Mode
Function
Port
LD(A B C D) I
MODE
SC
CP
IN
CP
XA
(A B C D) IR
(A B C D)
XL
L
X
L
HOLD
ASYNC
HOLD Input Register holds previous
state
L (H)
H
L
X
L
L (H)
ASYNC
LOAD Port A B C D clocked to Input
Register (A B C D) IR via CP
AX
positive edge
(Note 3)
(Notes 2 3)
H (Note 1)
L
(Note 3)
(Note 3)
SYNC
(Note 3)
Note 1
Low to High transitions of MODE
SO must be immediately preceeded by a low to high transition (clock edge) on CP
IN while holding Synchronous
Control Inputs LDAI LDBI LDCI and LDDI steady to preset internal registers and assure predictable operation during the control mode change from asynchronous
to synchronous
Note 2
LDAI LDBI LDCI and LDDI levels are synchronously asserted by the positive transition of CP
IN when MODE
SC is high
Note 3
Synchronous Control Mode Functions are same as Asynchronous at time T a 1ofCP
IN
3


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