74ACQ544SC Fairchild Semiconductor, 74ACQ544SC Datasheet - Page 2

• Manufacturer Part Number: 74ACQ544SC
• Description: IC TRANSCEIVER 8BIT N-INV 20SO
• Manufacturer: Fairchild Semiconductor
• Series: 74ACQr

Specifications of 74ACQ544SC

• Logic Type: Transceiver, Inverting
• Number Of Elements: 1
• Number Of Bits Per Element: 8
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 2 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Logic Symbols
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.
IEEE/IEC
2
Functional Description
The ACQ/ACTQ544 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 A
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. Control of data flow from B to A is similar, but using
the CEBA, LEBA and OEBA inputs.
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, LEBA and OEBA
CEAB
LOW Voltage Level
HIGH Voltage Level
Immaterial
H
X
X
L
L
0
–A
7
Inputs
LEAB
or take data from B
X
H
X
X
L
OEAB
H
X
X
X
L
Transparent
0
Latched
Latched
Status
Latch
–B
—
—
7
, as indicated in the
Buffers
Output
Driving
High Z
High Z
—
—