-21 -
*
1:
O
n
a
cco
u
n
t
of parts procurement
situat
i
on, the TC40H138FN was used as
a
substitution
of the
T
C
74HC138F for some of
CE
-
201M and CE-202M in earlier
productions
.
When the
TC40H
-
1
38FN on
i
s
i
n
failure
,
e
ither the TC40H138FN or TC74HC138F can be used
as
a
replacement
.
B
ut
w
hen
t
h
e
TC74HC138F
is
in use, it has to be replaced by the TC74HC138F, not the TC-
40H1
38FN which may impede proper
operat
i
on due
to
variation
in
access time by the RAM chip
u
s
ed.
T
C
74HC1
38F
(
TC40H138FN
)*
l
.
.
•
•
l.2MX
3
.
>
.
.
Al
l
1
YO
p!li
(
NU
)
"
A
Al
2
2
B
YT
~
(
NU
)
Al
3
t::);
3 c
Y2
~
(
NU
)
o
.
;
~F
DA
N
202
'-7
4
_
G2A
Y8
~
(
NU
)
II
G
ND
'~
5
~
G
2
B
Y4
..,
1 1
l.2
M
'
~
::'.:.
10
G
l
Y5
Y
GG
8
GND
Y6
~
1
559
8
16
YC
C
Y
7
t>-Z-
G
ND
~
A
DAN202
t::);
r
YC
C
~·
-
A
l
3
B-J
~
)
R
/
W
4_,~·~
CR
2
02
5
r
A
O
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YGG
~
A
l
+
I)
=
A
2
ir~
.
A
3
A4
.
A
5
TC55
1
7
A
FL
x
4
l
A
6
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1
8
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A
7
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t
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r
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D
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;------,
A
lO
A
l
7
flQ.!U
c-
,,___
-
,____
-----..
~ r----.
.
Al
l
A
2 6
11
D
2
r
,___
i--------
-
-
,____
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~
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A
l2
A3
5
1
3
D
3
.
-----
-
-
c----
-
~
i------
.
Al
3
A4 4
14
D
4
.
c-
,_____.._
-
-
c----
-
~
;------,
N
C
A5 3
1
5
D
5
-----
,_____.._
-
-
I----
-
~
-
N
C
A
6
2 16
D6
-
-
,____
-
~
-
c-
,__
N
C
AL--1
1
7
D
7
,----
i------
c----
-
~
-
NC
A
8
23
,----
c---- ~ c-
N
C
A9
22
,----
c---- ~
v---
DO
A
I
O
19
~
D
l
,----
I---- ~
!1_
GND
YDD
~
-
,___
- - -
,___
D2
D3
OE
R
/
W
.,..
.....
D
4
~
o
o
(
\
)
)
IJ
\)
'
)
2
1
-
D
5
>-
-
-
''
-
--
>-
-
-''-
~
-
>-
-
_11_
-
-
,_
--
-:
:-
t--
~
D6
V
GG
II
II
II
-
D7
G
ND
'
:::
.....
RA
M
C
E
r
NC
N
C
.
OE
~
Y
GG
~
l.2
M
"'
CN
-
1
CN
-
2
CN-
3
CN-
4
CN
-
5
C
N
-
6
C
N
-
7
CN-
8
C
N
-
9
CN
-
10
C
N
-
1
1
C
N
-
12
CN
-
1
3
C
N
-
14
CN-1
5
c
. _
16
C
N
-
17
CN
-1
8
CN
-
19
CN
-
20
ex
-
21
CN
-
22
C:S
-
23
C\
-
24
Cl\
-
25
CX
-
26
c
s
-
21
12.
CE-201M CIRCUIT DIAGRAM/PARTS LAYOUT CHART
(FLAT PACKAGE LSI)
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