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54ABT543W-QML датащит (Datasheet) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
№ деталь 54ABT543W-QML
подробность  Octal Registered Transceiver with TRI-STATE® Outputs
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
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Pin Descriptions
Pin Names
Description
OEAB , OEBA
Output Enable Inputs
LEAB , LEBA
Latch Enable Inputs
CEAB , CEBA
Chip Enable Inputs
A
0–A7
Side A Inputs or
TRI-STATE Outputs
B
0–B7
Side B Inputs or
TRI-STATE Outputs
Functional Description
The ’ABT543 contains two sets of D-type latches, with sepa-
rate input and output controls for each. For data flow from A
to B, for example, the A to B Enable (CEAB ) input must be
low in order to enter data from the A port or take data from
the B port as indicated in the Data I/O Control Table. With
CEAB low, a low signal on (LEAB ) input makes the A to B
latches transparent; a subsequent low to high transition of
the LEAB line puts the A latches in the storage mode and
their outputs no longer change with the A inputs. With CEAB
and OEAB both low, the B output buffers are active and
reflect the data present on the output of the A latches.
Control of data flow from B to A is similar, but using the
CEBA , LEBA and OEBA .
Data I/O Control Table
Inputs
Latch Status
Output
Buffers
CEAB
LEAB
OEAB
H
X
X
Latched
High Z
X
H
X
Latched
L
L
X
Transparent
X
X
H
High Z
L
X
L
Driving
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Logic Diagram
10021803
www.national.com
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