74ACQ573 Fairchild Semiconductor, 74ACQ573 Datasheet - Page 2

• Manufacturer Part Number: 74ACQ573
• Description: Quiet Series Octal Latch with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The ACQ/ACTQ573 contains eight D-type latches with 3-
STATE output buffers. When the Latch Enable (LE) input is
HIGH, data on the D
dition the latches are transparent, i.e., a latch output will
change state each time its D-type input changes. When LE
is LOW the latches store the information that was present
on the D-type inputs at 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 enabled. When OE is HIGH the buffers are in
the high impedance mode but this does not interfere with
entering new data into the latches.
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.
n
inputs enters the latches. In this con-
2
Truth Table
H
L
Z
X
O
0
LOW Voltage
High Impedance
HIGH Voltage
Immaterial
Previous O
OE
H
L
L
L
0
before HIGH-to-LOW transition of Latch Enable
Inputs
LE
H
H
L
X
D
H
X
X
L
Outputs
O
O
H
Z
L
n
0