JVC TH-A75R Service Manual page 19

4.3 MM74HCT32MTC-X (IC521) : Quad 2 input OR gate
• Pin layout & Block diagram
1A 1
1B 2
1Y 3
2A 4
2B 5
2Y 6
GND 7
(TOP VIEW)
4.4 74LCX373MTC-X (IC512,IC513) : Octal D-type latch
• Pin layout
OE 1
Q0 2
D0 3
D1 4
Q1 5
Q2 6
D2 7
D3 8
Q3 9
GND 10
(TOP VIEW)
• Block diagram
D0 D1 D2
3 4 7
D D D
Q Q
L L L
11
LE
1
OE
2 5
Q0 Q1
14 V
CC
13 4B
12 4A
11 4Y
10 3B
9 3A
8 3Y
20 VCC
19 Q7
18 D7
17 D6
16 Q6
15 Q5
14 D5
13 D4
12 Q4
11 LE
D3 D4 D5 D6
8 13 14 17
D D D
Q Q Q Q
L L L
6 9 12 15
Q2 Q3 Q4 Q5
• Truth table
INPUTS
A B
L L
L H
H L
H H
• Truth table
INPUTS
OE LE
H X
L L
L H
L H
X: Don't care
Z: High impedance
Qn: Q outputs are latched at the time when the LE input is tak-
en to a low logic level.
D7
18
D D
Q Q
L L
16 19
Q6 Q7
OUTPUT
Y
L
H
H
H
OUTPUT
D Y
X Z
X Qn
L L
H H
(No.21189)1-19
TH-A75R