74ABT543CMSAX Fairchild Semiconductor, 74ABT543CMSAX Datasheet - Page 2

• Manufacturer Part Number: 74ABT543CMSAX
• Description: IC TRANSCVR TRI-ST 8BIT 24SSOP
• Manufacturer: Fairchild Semiconductor
• Series: 74ABTr

Specifications of 74ABT543CMSAX

• Logic Type: Registered Transceiver, Non-Inverting
• Number Of Elements: 2
• Number Of Bits Per Element: 8
• Current - Output High, Low: 32mA, 64mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Functional Description
The ABT543 contains two sets of D-type latches, with sep-
arate 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 transi-
tion 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.
Logic Diagram
2
Data I/O Control Table
H
L
X
CEAB LEAB OEAB
LOW Voltage Level
HIGH Voltage Level
Immaterial
H
X
L
X
L
Inputs
H
X
X
X
L
H
X
X
X
L
Latch Status
Transparent
Latched
Latched
—
—
Output Buffers
HIGH Z
HIGH Z
Driving
—
—