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74AC373 Fiches technique(PDF) 2 Page - ON Semiconductor

No de pièce 74AC373
Description  Octal Transparent Latch with 3?뭆tate Outputs
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

74AC373 Fiches technique(HTML) 2 Page - ON Semiconductor

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MC74AC373, MC74ACT373
http://onsemi.com
2
TRUTH TABLE
Inputs
Outputs
OE
LE
Dn
On
H
X
X
Z
L
H
L
L
L
H
H
H
L
L
X
O0
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
O0 = Previous O0 before LOW-to-HIGH Transition of Clock
FUNCTIONAL DESCRIPTION
The MC74AC373/74ACT373 contains eight D−type
latches with 3−state standard outputs. 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 standard
outputs are controlled by the Output Enable (OE) input.
When OE is LOW, the standard 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.
Figure 3. Logic Diagram
D
G
O
D
G
O
D
G
O
D
G
O
D
G
O
D
G
O
D
G
O
D
G
O
D1
D2
D3
D4
D5
D6
D7
LE
OE
D0
NOTE:
This diagram is provided only for the understanding of logic operations and
should not be used to estimate propagation delays.


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