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54F573 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 54F573
Description  Octal D-Type Latch with TRI-STATE Outputs
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F573 Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
D0–D7
Data Inputs
1010
20 mA b06 mA
LE
Latch Enable Input (Active HIGH)
1010
20 mA b06 mA
OE
TRI-STATE Output Enable Input
1010
20 mA b06 mA
(Active LOW)
O0–O7
TRI-STATE Latch Outputs
15040(333)
b
3 mA24 mA (20 mA)
Functional Description
The ’F573 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 latch-
es are transparent ie 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 interfer with entering new data into
the latches
Function Table
Inputs
Outputs
OE
LE
D
O
LH
H
H
LH
L
L
LL
X
O0
HX
X
Z
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
O0 e Value stored from previous clock cycle
Logic Diagram
TLF9566 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2


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