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54FCT573 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 54FCT573
Descripción Electrónicos  Octal D-Type Latch with TRI-STATE Outputs
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

54FCT573 Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Functional Description
The ’FCT573 contains eight D-type latches with TRI-STATE
output buffers. When the Latch Enable (LE) input is HIGH,
data on the D
n inputs enters the latches. In this 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 transition 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.
Function Table
Inputs
Outputs
OE
LE
D
O
LH
H
H
LH
L
L
LL
X
O
0
HX
X
Z
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
O0 = Value stored from previous clock cycle
Logic Diagram
DS100951-3
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.national.com
2


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