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54F825FM Folha de dados(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças 54F825FM
Descrição Electrónicos  8-Bit D-Type Flip-Flop
Download  8 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F825FM Folha de dados(HTML) 3 Page - National Semiconductor (TI)

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Functional Description
The ’F825 consists of eight D-type edge-triggered flip-flops
This device has TRI-STATE true outputs and is organized in
broadside pinning In addition to the clock and output en-
able pins the buffered clock (CP) and buffered Output En-
able (OE) are common to all flip-flops The flip-flops will
store the state of their individual D inputs that meet the
setup and hold times requirements on the LOW-to-HIGH CP
transition With the OE LOW the contents of the flip-flops
are available at the outputs When the OE is HIGH the out-
puts go to the high impedance state Operation of the OE
input does not affect the state of the flip-flops The ’F825
has Clear (CLR) and Clock Enable (EN) pins
When the CLR is LOW and the OE is LOW the outputs are
LOW When CLR is HIGH data can be entered into the flip-
flops When EN is LOW data on the inputs is transferred to
the outputs on the LOW-to-HIGH clock transition When the
EN is HIGH the outputs do not change state regardless of
the data or clock input transitions
Function Table
Inputs
Internal
Output
Function
OE
CLR
EN
CP
D
Q
O
H
H
L
H
X
NC
Z
Hold
H
H
L
L
X
NC
Z
Hold
H
H
H
X
X
NC
Z
Hold
L
H
H
X
X
NC
NC
Hold
H
L
X
X
X
H
Z
Clear
L
L
X
X
X
H
L
Clear
HH
L
L
L
H
Z
Load
HH
L
L
H
L
Z
Load
LH
L
L
L
H
L
Data Available
LH
L
L
H
L
H
Data Available
L
H
L
H
X
NC
NC
No Change in Data
L
H
L
L
X
NC
NC
No Change in Data
L e LOW Voltage Level
H e HIGH Voltage Level
X e Immaterial
Z e High Impedance
L e LOW-to-HIGH Transition
NC e No Change
Logic Diagram
TLF9597 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
3


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