DTR-8.2
IC BLOCK GIAGRAMS AND DESCRIPTIONS
TC74VHC574FT(Octal D-FF with 3-state output)
OE
D0
D1
D2
D3
D4
D5
D6
D7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vcc
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
CK
Z
Qn
L
H
X :Don't care
Z :High impedance
Qn :No change
OE
H
L
L
L
CK
X
D
X
X
L
H
OUTPUT
INPUTS
Q0
19
D
CK
Q
D0
2
D
CK
Q
D1
Q1
3
18
D
CK
Q
D2
Q2
4
17
D
CK
Q
D3
Q3
5
16
D
CK
Q
D6
Q6
8
13
D
CK
Q
D7
Q7
9
12
D
CK
Q
D5
Q5
7
14
D
CK
Q
D4
Q4
6
15
CK
OE
11
1
G1
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vcc
G2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Z
Z
H
L
X :Don't care
Z :High impedance
G1
H
X
L
L
G2
X
H
L
L
An
X
X
H
L
OUTPUT
INPUTS
TC74VHC541FT(Octal bus buffer)
CLR
L
H
L
H
H
H
PR
H
L
L
H
H
H
D
X
X
X
L
H
X
CK
X
X
X
Q
L
H
H
L
H
Qn
Q
H
L
H
H
L
Qn
CLEAR
PRESET
NO CHANGE
INPUTS OUTPUTS FUNCTION
X: Don't care
TC74VHC74FT(Dual D-FF with preset and clear)
1
2
3
4
5
6
7
1CLR
1D
1CK
1PR
1Q
1Q
GND
14
13
12
11
10
9
8
Vcc
2CLR
2D
2CK
2PR
2Q
2Q
CK D
Q Q
CK D
Q Q
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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