Integra DTR-7.6 Series Service Manual page 57

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3 7 63 1515 0
IC BLOCK DIAGRAMS AND DESCRIPTIONS
74HC04F(Hex Inverter)
1
1A
2
1Y
3
2A
4
2Y
5
3A
6
3Y
7
GND
TC74VHC541FT/T541AFT(Octal buss buffer)
1
G1
2
A1
3
A2
4
A3
TE
5
L 13942296513
A4
6
A5
7
A6
8
A7
9
A8
10
GND
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SELECT
14 Vcc
1A
13 6A
1B
1Y
12 6Y
2A
11 5A
2B
10 5Y
2Y
9 4A
GND
8 4Y
Vcc
20
Truth Table
G2
19
Y1
18
G1
Y2
17
H
Y3
16
X
Y4
15
L
Y5
14
Y6 L
13
Y7
12
X:Don't care
Y8
Z:High Impedance
11
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2 9
8
TC74VHC157FT(Quad 2-channel Multiplexer)
Vcc
1 16
ST
A S G
2 15
4A
3 B A
14
4B
4 Y
B 13
4Y
5 A
Y 12
3A
B
6 A 11
3B
7 10
Y Y B
3Y
8 9
INPUTS
OUTPUT
An Yn
G2
Q Q
X
X Z
3 6 7 1 3 1 5
X
H Z
L H H
L
L L
co
.
9 4 2 8
Truth Table
INPUTS
ST SELECT A B
H X X X
L L L X
L L H X
L H X L
L H X H
X:Don't care
TC7WU04FU(3 Inverter)
1A 8 Vcc
1
3Y 7 1Y
2
0 5 8 2 9 9 4 2 8
6 3A
2A 3
GND 5 2Y
4
m
DTR-7.6
9 9
OUTPUT
L
L
H
L
H
9 9