(No.49868)1-29
6.2
HA17558F (IC571) : Ope. amp.
• Pin layout & Block diagram
6.3
MM74HC126SJ-X (IC691) : 3-state Quad buffer
• Pin layout & Block diagram
• Truth table
H : High level
L : Low level
X : Don't care
Z : Hi-Z
1
2
3
4
8
7
6
5
Vcc
GND
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V
cc
C
4
A
4
Y
4
C
3
A
3
Y
3
C1
A1
Y1
C2
A2
Y2
G
ND
INPUT
OUTPUT
A
C
Y
H
H
H
L
H
L
X
L
Z
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9
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9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
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