74ABT573 Fairchild Semiconductor, 74ABT573 Datasheet - Page 2

• Manufacturer Part Number: 74ABT573
• Description: Octal D-Type Latch with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The ABT573 contains eight D-type latches with 3-STATE
output buffers. When the Latch Enable (LE) input is HIGH,
data on the D
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 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 condition
2
Function Table
H
L
X
O
0
LOW Voltage Level
HIGH Voltage Level
Immaterial
Value stored from previous clock cycle
OE
H
L
L
L
Inputs
LE
H
H
L
X
D
H
X
X
L
Outputs
O
O
H
Z
L
0