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74ABT16543CSSC 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 74ABT16543CSSC
功能描述  16-Bit Registered Transceiver with 3-STATE Outputs
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74ABT16543CSSC 数据表(HTML) 2 Page - Fairchild Semiconductor

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Logic Symbol
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 CEBAn, LEBAn and OEBAn
Functional Description
The ABT16543 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 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. Each byte has separate con-
trol inputs, allowing the device to be used as two 8-bit
transceivers or as one 16-bit transceiver.
Logic Diagrams
Byte 1 (0:7)
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
Byte 2 (8:15)
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
CEABn LEABn OEABn
(Byte n)
(Byte n)
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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