74ACT16543 Fairchild Semiconductor, 74ACT16543 Datasheet - Page 2

• Manufacturer Part Number: 74ACT16543
• Description: 16-Bit Registered Transceiver with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The ACT16543 contains sixteen non-inverting transceivers
with 3-STATE outputs. The device is byte controlled with
each byte functioning identically, but independent of the
other. The control pins may be shorted together to obtain
full 16-bit operation. The following description applies to
each byte. For data flow from A to B, for example, the A-to-
B Enable (CEAB
data from A
the Data I/O Control Table. With CEAB
nal on the A-to-B Latch Enable (LEAB
to-B latches transparent; a subsequent LOW-to-HIGH tran-
sition of the LEAB
mode and their outputs no longer change with the A inputs.
With CEAB
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
Logic Diagrams
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
n
0
–A
and OEAB
15
n
or take data from B
n
) input must be LOW in order to enter
n
signal puts the A latches in the storage
, LEBA
n
both LOW, the 3-STATE B output
Byte 1
(0:7)
n
and OEBA
0
n
–B
) input makes the A-
n
n
LOW, a LOW sig-
15
inputs.
, as indicated in
2
Data I/O Control Table
H
L
X
A-to-B data flow shown; B-to-A flow control
is the same, except using CEBA
CEAB
LOW Voltage Level
HIGH Voltage Level
Immaterial
H
X
X
L
L
n
LEAB
Inputs
X
H
X
X
L
n
OEAB
X
X
X
H
L
n
, LEBA
Byte 2
(8:15)
n
n
Latch Status
and OEBA
Transparent
(Byte n)
Latched
Latched
—
—
n
(Byte n)
Buffers
Output
Driving
High Z
High Z
—
—