JVC KD-LH3105 Service Manual page 32

4.6 HD74HC126FP-X (IC781) : Buffer
• Pin layout
1
1C
2
1A
3
1Y
4
2C
5
2A
6
2Y
7
GND
• Block diagram
Vcc
Input
Note:
CL includes probe and jig capacitance
1-32 (No.49839)
14
VCC
13
4C
12
4A
11
4Y
10
3C
9
3A
8
3Y
Vcc
1A
Output
1Y
2A
3A
4A
1C
2C
Output
3C
2Y
4C
Output
3Y
Output
4Y
• Pin function
Input Output
C A Y
L X Z
H L H
H H L
Note:
H:High level
L:Low level
X:Irrelevant
Z:Off(High-impedance)
State a 3-state input
1k
S1
CL
1k
Sample as Load Circuit 1
Sample as Load Circuit 1
Sample as Load Circuit 1