74ABT NSC [National Semiconductor], 74ABT Datasheet - Page 2

• Manufacturer Part Number: 74ABT
• Description: Octal Transparent Latch with TRI-STATE Outputs
• Manufacturer: NSC [National Semiconductor]

Functional Description
The
TRI-STATE output buffers When the Latch Enable (LE) in-
put is HIGH data on the D
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 tran-
sition of LE The TRI-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 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
’ABT373
contains
n
inputs enters the latches In this
eight
D-type
latches
with
2
Truth Table
H
L
X
Z
e
e
e
e
LOW Voltage Level
High Impedance State
HIGH Voltage Level
Immaterial
LE
H
H
L
X
Inputs
OE
H
L
L
L
D
H
X
X
L
n
O
n
(no change)
Output
O
H
L
Z
n
TL F 11547 – 3