M74Hc138 Internal Block & Truth Table; Upd16315 Internal Block - Philips MX1060D Service Manual
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Also See for MX1060D:
- User manual (29 pages) ,
- Specification sheet (2 pages) ,
- Service information (7 pages)
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M74HC138 INTERNAL BLOCK & TRUTH TABLE
DX
1
A
0
2
0
B
G
7
3
C
2
4
G2A
5
G2B
&
6
G1
Vcc
16
GND
8
UPD16315 INTERNAL BLOCK
uPD16315
7
D
IN
6
Serial
D
OUT
Interface
8
CLK
9
STB
5
OSC
OSC
10, 11
Key1, Key2
TRUTH TABLE
15
0
ENABLE
Y0
14
Y1
G2B
G2B
1
13
X
X
2
Y2
12
X
H
3
Y3
11
H
X
4
Y4
L
L
10
5
Y5
L
L
9
6
Y6
L
L
7
7
Y7
L
L
L
L
L
L
L
L
L
L
X = Don't care
Command decoder
Display memory
24 buts x 12 words
Timing generator
key scan
Key data memory(2x16 bits)
4-bit latch
1
4
LED
LED
1
6-4
INPUTS
SELECT
G1
C
B
A
Y0
L
X
X
X
H
X
X
X
X
H
X
X
X
X
H
H
L
L
L
L
H
L
L
H
H
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
Dimming circuit
13,
12,
43
44
V
V
DD
4
(+5V)
(0V)
OUTPUTS
Y1
Y2
Y3
Y4
Y5
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
14
Seg
/KS
1
1
29
Seg
/KS
16
16
31
Seg
/Grid
17
38
Seg
/Grid
24
42
Grid
1
39
Grid
4
30
V
EE
SS
(-30V)
Y6
Y7
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
L
12
5
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