JVC CH-X1500 Service Manual page 34

CH-X1500
4.5 HD74HCT126T-X : (IC541,IC691) Buffer
QQ
• Pin arrangement
3 7 63 1515 0
1C
1
1A
2
1Y
3
2C
4
2A
5
2Y
6
GND
7
• Block diagram
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L 13942296513
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1-34
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14
Vcc
13
4C
12
4A
11
4Y
10
3C
9
3A
8
3Y
1A
1C
2A
2C
3A
3C
4A
4C
x ao
y
. i
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• Pin function
8
Input Output
C A
L X
H L
H H
H : High level
L : Low level
X : Irrelevant
Z : Off (Hhigh-impedance)state of a 3-stage output
Q Q
3 6 7 1 3
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.
2 9 9 4 2 8
Y
Z
L
H
1Y
1 5 0 5 8 2 9 9 4
2Y
3Y
4Y
m
co
9 9
2 8 9 9