JVC CH-X1500 Service Manual page 34

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