74VHCT573 Fairchild Semiconductor, 74VHCT573 Datasheet - Page 2

• Manufacturer Part Number: 74VHCT573
• Description: Octal D-Type Latch with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The VHCT573A 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 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 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
X
Z
LOW Voltage Level
High Impedance
HIGH Voltage Level
Immaterial
OE
H
L
L
L
Inputs
LE
H
H
X
L
D
H
L
X
X
Outputs
O
O
H
L
Z
n
0