MC74ACT563 Motorola, MC74ACT563 Datasheet - Page 2

• Manufacturer Part Number: MC74ACT563
• Description: OCTAL D-TYPE LATCH WITH 3-STATE OUTPUTS
• Manufacturer: Motorola

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DataSheet
FUNCTIONAL DESCRIPTION
latches with 3-state complementary outputs. When the Latch
Enable (LE) input is HIGH, data on the D n inputs enters the
latches. In this condition the latches are transparent, i.e., a
latch output will change state each time its D input changes.
When LE is LOW the latches store the information that was
present on the D inputs a setup time preceding the
HIGH-to-LOW transition of LE. The 3-state buffers are
controlled by the Output Enable (OE) input. When OE is LOW,
the buffers are in the bi-state mode. When OE is HIGH the
buffers are in the high impedance mode but that does not
interfere with entering new data into the latches.
4
U
The MC74AC563/74ACT563 contains eight D-type
.com
LE
OE
D 0
D
C
Q
O 1
D 1
D
C
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
Q
O 2
D 2
MC74AC563 MC74ACT563
D
C
Q
O 3
D 3
LOGIC DIAGRAM
D
FACT DATA
C
Q
5-2
O 4
D 4
FUNCTION TABLE
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
NC = No Change
OE
H
H
H
H
L
L
L
D
C
Inputs
Q
LE
X
H
H
H
H
L
L
O 5
D 5
D
H
H
X
L
X
L
X
D
C
Internal
Q
NC
NC
Q
H
H
X
L
L
O 6
D 6
D
Outputs
C
NC
O
Z
Z
Z
Z
H
L
Q
D 7
O 7
High Z
High Z
High Z
Latched
Transparent
Transparent
Latched
D
C
Function
Function
Q
O 8