32
1.38.
IC53, IC105, IC845 and IC849 on the Main Board are
using the 2-ch Multiplexer/Demultiplexer IC
YWTC4W53FUL.
Description of this IC is as follows:
8 V
DD
7 In 0
6 In 1
5 A
Out 1
INHI 2
V
EE
3
Vss 4
INPUTS
L
L
H
L
H
∗
∗
INHI A
OUT
IN 0
IN 1
None
: Don't Care.
(TOP VIEW)
Truth Table
1.39.
IC403, IC502, IC805, IC809, IC814 and IC818 on the
Main Board are using the Dual Operational Amplifiers
IC YWNJM4565M.
Description of this IC is as follows:
8 Vcc
7 OUT B
6 IN– B
5 IN+ B
OUT A 1
IN– A 2
IN+ A 3
GND 4
(TOP VIEW)
– +
+ –
B
A
1.40.
IC807, IC816, IC821, IC824 IC827 and IC847 on the
Main Board are using the Triple Inverters IC
YWTC7W04FUL.
Description of this IC is as follows:
(TOP VIEW)
Truth Table
OUTPUTS (Y)
L
H
H
L
INPUTS (A)
8 Vcc
7 1Y
6 2A
5 3Y
1A 1
2Y 2
3A 3
GND 4
2. Power Board
2.1.
IC1 on the Power Board are using the Switching
Regulator Controller IC YWFA5304P.
Description of this IC is as follows:
+
–
1
2
3
4
6
5
8
7
BIAS
OSC
UVLO
10µA
0.45V
7V
2V
OFF
3.6V
+
–
–
–
R
S
Q
0.24V
CS
CT
Vcc
OUT
IS
GND
IN–
FB
8 CS
7 CT
6 Vcc
5 OUT
IN– 1
FB 2
IS 3
GND 4
+
–
+
–
+
–
–
+
(TOP VIEW)
2. Front Board
2.1.
IC1 on the Front Board are using the Quad 3-State 2
to 1 Data Selectors IC YWMC74HC257F.
Description of this IC is as follows:
SELECT 1
1A 2
1B 3
1Y 4
2A 5
2B 6
2Y 7
GND 8
16 Vcc
15 OUT CONT
14 4A
13 4B
12 4Y
11 3A
10 3B
9 3Y
(TOP VIEW)
L
H
Truth Table
INPUTS
OUTPUT
Y
SELECT
OUT CONT
A
B
Z
L
L
H
Z : High Impedance
:
Don’t care.
∗
∗