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54ACTQ543 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. 54ACTQ543
Description  Quiet Series Octal Registered Transceiver with TRI-STATE Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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54ACTQ543 Datasheet(HTML) 2 Page - National Semiconductor (TI)

 
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Connection Diagrams
Pin Names
Description
OEAB
A-to-B Output Enable Input (Active LOW)
OEBA
B-to-A Output Enable Input (Active LOW)
CEAB
A-to-B Enable Input (Active LOW)
CEBA
B-to-A Enable Input (Active LOW)
LEAB
A-to-B Latch Enable Input (Active LOW)
LEBA
B-to-A Latch Enable Input (Active LOW)
A
0–A7
A-to-B Data Inputs or
B-to-A TRI-STATE Outputs
B
0–B7
B-to-A Data Inputs or
A-to-B TRI-STATE Outputs
Functional Description
The ACTQ543 contains two sets of eight D-type latches, with
separate input and output controls for each set. 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 A
0–A7 or take data
from B
0–B7, as indicated in the Data I/O Control Table. With
CEAB LOW, a LOW signal on the A-to-B Latch Enable
(LEAB) input makes the A-to-B latches transparent; a subse-
quent LOW-to-HIGH transition of the LEAB signal 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 TRI-STATE B output buffers are active and reflect the
data present at the output of the A latches. Control of data
flow from B to A is similar, but using the CEBA, LEBA and
OEBA inputs.
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
A-to-B data flow shown; B-to-A flow control is the same, except using CEBA,
LEBA and OEBA
Pin Assignment for
DIP and Flatpak
DS100233-2
Pin Assignment
for LCC
DS100233-3
www.national.com
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