MC74LCX574(2005) 查看數據表（PDF） - ON Semiconductor
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MC74LCX574 Datasheet PDF : 8 Pages
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MC74LCX574
VCC O0 O1 O2 O3 O4 O5 O6 O7 CP
20 19 18 17 16 15 14 13 12 11
1
OE
11
CP
2
D0
nCP
Q
D
19
O0
1 2 3 4 5 6 7 8 9 10
OE D0 D1 D2 D3 D4 D5 D6 D7 GND
Figure 1. Pinout: 20−Lead (Top View)
3
D1
4
D2
nCP
Q
D
nCP
Q
D
18
O1
17
O2
5
D3
nCP
Q
D
16
O3
PIN NAMES
Pins
Function
OE
CP
D0−D7
O0−O7
Output Enable Input
Clock Pulse Input
Data Inputs
3−State Outputs
6
D4
7
D5
8
D6
nCP
Q
D
nCP
Q
D
nCP
Q
D
15
O4
14
O5
13
O6
9
D7
nCP
Q
D
Figure 2. LOGIC DIAGRAM
12
O7
TRUTH TABLE
INPUTS
OE
CP
Dn
L
↑
l
L
↑
h
L
↑
X
H
↑
X
H
↑
l
H
↑
h
INTERNAL
LATCHES
Q
L
H
NC
NC
L
H
OUTPUTS
On
L
H
NC
Z
Z
Z
OPERATING MODE
Load and Read Register
Hold and Read Register
Hold and Disable Outputs
Load Internal Register and Disable Outputs
H = High Voltage Level
h = High Voltage Level One Setup Time Prior to the Low−to−High Clock Transition
L = Low Voltage Level
l = Low Voltage Level One Setup Time Prior to the Low−to−High Clock Transition
NC = No Change
X = High or Low Voltage Level and Transitions are Acceptable
Z = High Impedance State
↑ = Low−to−High Transition
↑ = Not a Low−to−High Transition; For ICC Reasons, DO NOT FLOAT Inputs
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