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74LCX543 Arkusz danych(PDF) 2 Page - Fairchild Semiconductor

Numer części 74LCX543
Szczegółowy opis  Low Voltage Octal Registered Transceiver with 5V Tolerant Inputs and Outputs
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74LCX543 Arkusz danych(HTML) 2 Page - Fairchild Semiconductor

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Logic Symbols
IEEE/IEC
Data I/O Control Table
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
Functional Description
The LCX543 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 A0–A7 or
take data from B0–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 subsequent 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 3-STATE B output buffers are active and
reflect the data present at the output of the A latches. Con-
trol of data flow from B to A is similar, but using the CEBA,
LEBA and OEBA inputs.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Inputs
Latch Status
Output Buffers
CEAB LEAB OEAB
H
X
X
Latched
High Z
X
H
X
Latched
L
L
X
Transparent
XX
H
High Z
LX
L
Driving


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