54FCT533D NSC [National Semiconductor], 54FCT533D Datasheet - Page 2

• Manufacturer Part Number: 54FCT533D
• Description: Octal Transparent Latch with TRI-STATE Outputs
• Manufacturer: NSC [National Semiconductor]

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Connection Diagrams
Functional Description
The FCT533 contains eight D-type latches with TRI-STATE
standard outputs. 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 tran-
sition of LE. The TRI-STATE standard outputs are controlled
by the Output Enable (OE) input. When OE is LOW, the stan-
dard outputs are in the 2-state mode. When OE is HIGH, the
standard outputs 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.
for DIP and Flatpak
n
Pin Assignment
inputs enters the latches. In this con-
DS100969-3
2
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
O
0
= Previous O
LE
X
H
H
L
0
before HIGH to Low transition of Latch Enable
Pin Assignment
Inputs
OE
H
L
L
L
for LCC
D
H
X
L
X
n
DS100969-4
DS100969-5
Outputs
O
O
Z
H
L
n
0