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74FR543 Datasheet(Fiches technique) 2 Page - Fairchild Semiconductor

Numéro de pièce 74FR543
Description  Octal Latched Transceiver with 3-STATE Outputs
Télécharger  6 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74FR543 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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Pin Descriptions
Functional Description
The 74FR543 contains two sets of D-type latches, with
separate 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 out-
put 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
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Logic Diagram
Pin Names
Description
OEAB, OEBA
Output Enable Inputs
LEAB, LEBA
Latch Enable Inputs
CEAB, CEBA
Chip Enable Inputs
A0–A7
Side A Inputs or 3-STATE Outputs
B0–B7
Side B Inputs or 3-STATE Outputs
Inputs
Latch
Output
CEAB LEAB OEAB
Status
Buffers
H
X
X
Latched
High Z
X
H
X
Latched
L
L
X
Transparent
XX
H
High Z
L
X
L
Driving


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