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74AC574 Datasheet(Hoja de datos) 2 Page - Fairchild Semiconductor

No. de Pieza. 74AC574
Descripción  Octal D-Type Flip-Flop with 3-STATE Outputs
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
Function Table
H
HIGH Voltage Level
L
LOW Voltage Level
X
Immaterial
Z
High Impedance
 LOW-to-HIGH Transition
NC
No Change
Functional Description
The AC/ACT574 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-STATE true outputs.
The buffered clock and buffered Output Enable are com-
mon to all flip-flops. The eight flip-flops will store the state
of their individual D-type inputs that meet the setup and
hold time requirements 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 go to the high impedance state. Oper-
ation of the OE input does not affect the state of the flip-
flops.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Pin Names
Description
D0–D7
Data Inputs
CP
Clock Pulse Input
OE
3-STATE Output Enable Input
O0–O7
3-STATE Outputs
Inputs
Internal
Outputs
Function
OE
CP D
Q
ON
HH
L
NC
Z
Hold
H
H
H
NC
Z
Hold
H
 L
L
Z
Load
H
 H
H
Z
Load
L
 L
L
L
Data Available
L
 H
H
H
Data Available
L
H
L
NC
NC
No Change in Data
L
H
H
NC
NC
No Change in Data




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