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74FR573 Datasheet(PDF) 2 Page - Fairchild Semiconductor

No. de pieza 74FR573
Descripción Electrónicos  Octal D-Type Latch with 3-STATE Outputs
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74FR573 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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Functional Description
The 74FR573 contains eight D-type latches with 3-STATE
output buffers. When the latch enable (LE) input is HIGH,
data on the Dn 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 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.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Logic Diagram
Inputs
Output
OE
LE
Dn
On
LH
H
H
LH
L
L
LL
X
On − 1
H
X
X
High Z State


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