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MC74AC574DTR2 bảng dữ liệu(PDF) 2 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  Octal D Flip-Flop with 3-State Outputs
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MC74AC574, MC74ACT574
http://onsemi.com
2
Figure 2. Logic Symbol
O0 O1 O2 O3 O4 O5 O6 O7
D0 D1 D2 D3 D4 D5 D6 D7
CP
OE
FUNCTIONAL DESCRIPTION
The MC74AC574/74ACT574 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 common to all flip–flops. The eight flip–flops
will store the state of their individual D 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. Operation of the OE input does not affect
the state of the flip–flops.
FUNCTION TABLE
Inputs
Internal
Outputs
F nction
OE
CP
D
Q
On
Function
H
H
L
NC
Z
Hold
H
HH
NC
Z
Hold
H
LL
Z
Load
H
HH
Z
Load
L
LL
L
Data Available
L
HH
H
Data Available
L
HL
NC
NC
No Change in Data
L
H
H
NC
NC
No Change in Data
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
= LOW-to-HIGH Clock Transition
NC = No Change
Figure 3. Logic Diagram
D0
D1
D2
D3
D4
D5
D6
D7
CD
Q
O0
O1
O2
O3
O4
O5
O6
O7
OE
CP
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
NOTE:
This diagram is provided only for the understanding of logic operations
and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
–0.5 to +7.0
V
VIN
DC Input Voltage (Referenced to GND)
–0.5 to VCC +0.5
V
VOUT
DC Output Voltage (Referenced to GND)
–0.5 to VCC +0.5
V
IIN
DC Input Current, per Pin
±20
mA
IOUT
DC Output Sink/Source Current, per Pin
±50
mA
ICC
DC VCC or GND Current per Output Pin
±50
mA
Tstg
Storage Temperature
–65 to +150
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the
Recommended Operating Conditions.


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