Hcf4094B; 74Hc4051 - NAD T 752 Service Manual

HCF4094B

KEYBOARD: U204~U207
SERIAL
D
2
IN
CL
CL
CLOCK 3 CL
CL
1 CL
STROBE
CL
OUTPUT
15
ENABLE
V DD
V SS

74HC4051

KEYBOARD: U208
CHANNELS
IN/OUT
COM OUT/IN
CHANNELS
IN/OUT
Q D Q
1 2
CL
CL
p n
TL TL
TL
p
TR
n
LATCH
2
TL
TR
LATCH 1
3-
3-STATE
STATE
1
2
p n
V DD V SS
2 2
Q1 Q2
74HC4051
4
1
6
2
3
7
4
5
5
INH
6
V
7
EE
GND
8
D Q
3
CL
Q
CL
TR
STAGES
3 - 7
TR
2 2 2 2 2
Q3 Q4 Q5 Q6 Q7
V
16
CC
2
15
1
14 CHANNELS
IN/OUT
0
13
3
12
A
11
B
10
C
9
41
CL
Q'
S
p
SERIAL
10
n
CL
CL
p
n
CL
Q
S
SERIAL
9
LATCH
3
3-
STATE
3
2
Q8
OUT
OUT