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54FCT574 Datasheet(数据表) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件型号  54FCT574
说明  Octal D-Type Flip-Flop with TRI-STATE Outputs
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
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 2 page
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Functional Description
The ’FCT574 consists of eight edge-triggered flip-flops with
individual D-type inputs and TRI-STATE true outputs. The
buffered clock and buffered Output Enable are common to all
flip-flops. The eight flip-flops will store the state of their indi-
vidual D inputs that meet the setup and hold times require-
ments on the LOW-to-HIGH Clock (CP) transition. With the
Output Enable (OE) LOW, the contents of the eight flip-flops
are available at the outputs. When OE is HIGH, the outputs
are in a high impedance state. Operation of the OE input
does not affect the state of the flip-flops.
Function Table
Inputs
Internal Outputs
Function
OE
CP
D
Q
O
H
H or L
L
NC
Z
Hold
Inputs
Internal Outputs
Function
OE
CP
D
Q
O
H
H or L
H
NC
Z
Hold
H
N
L
L
Z
Load
H
N
H
H
Z
Load
L
N
L
L
L
Data Available
L
N
H
H
H
Data Available
L
H or L
L
NC
NC
No Change in Data
L
H or L
H
NC
NC
No Change in Data
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
N = LOW-to-HIGH Transition
NC = No Change
Logic Diagram
DS100966-3
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
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