Integra DTR-8.2 Service Manual page 18

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