Philips MX1060D - M74 Hc138 Internal Block & Truth Table; Upd16315 Internal Block

6-4
M74HC138 INTERNAL BLOCK & TRUTH TABLE
15
&
G
0
7
0
2
DX
0
1
7
6
5
4
3
2
7
9
10
11
12
13
14
1
2
3
4
5
6
16
8
A
B
C
G2A
G2B
G1
Vcc
GND
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
G2B
X
X
H
L
L
L
L
L
L
L
L
G2B
X
H
X
L
L
L
L
L
L
L
L
G1
L
X
X
H
H
H
H
H
H
H
H
C
X
X
X
L
L
L
L
H
H
H
H
B
X
X
X
L
L
H
H
L
L
H
H
A
X
X
X
L
H
L
H
L
H
L
H
Y0
H
H
H
L
H
H
H
H
H
H
H
Y2
H
H
H
H
H
L
H
H
H
H
H
Y3
H
H
H
H
H
H
L
H
H
H
H
Y4
H
H
H
H
H
H
H
L
H
H
H
Y5
H
H
H
H
H
H
H
H
L
H
H
Y6
H
H
H
H
H
H
H
H
H
L
H
Y7
H
H
H
H
H
H
H
H
H
H
L
Y1
H
H
H
H
L
H
H
H
H
H
H
ENABLE SELECT
INPUTS
OUTPUTS
TRUTH TABLE
X = Don't care
Command decoder
Display memory
24 buts x 12 words
Serial
Interface
OSC
Timing generator
key scan
Key data memory(2x16 bits)
Dimming circuit
24-bit output latch
Segment driver
multiplexed driver
Data selector
12-bit shift register
Grid driver
Grid 4
Grid 1
Seg 17 /Grid 12
Seg 24 /Grid 5
Seg 1 /KS 1
Seg 16 /KS 16
D IN
D OUT
CLK
STB
OSC
Key1, Key2
LED
4
LED 1
4-bit latch
V
DD
(+5V)
V
SS
(0V)
V
EE
(-30V)
1
4
5
6
7
8
9
10, 11
12,
44
13,
43
30
14
29
31
38
39
42
uPD16315
UPD16315 INTERNAL BLOCK