Kenwood TS-440S Serivce Manual page 30

TS-440S
SEMICONDUCTO R
MB8418-LP20-GRA (Control unit 1050 )
,uPD7800
Memoria l
Alley
128 x16 x 8
0E0
A4
n
a
A3 0
.~ S
}CA B
Address
buffe r
--
IT
Inpu t
buffe
I/O gat e
column decode r
I /0 buffe r
WR
WE
Lo w
decode r
Addres s
buffer
L
CAB
Symbol Pin nam e
Ao—A 10 Address inpu t
I(1 — II
Ix
Data in/ou t
CS
Chip select 1
CS 2 Chip select 2
WE Write enabl e
Vcc Power (1 .5 V )
GND GN D
NC . No connection
mo o
GN D
AI O
OE1 0
TL
B
(IC4)
Q50
De,
cs e
Inpu t
buffer
CS B
cs ,
Y1
7
I
SN74LS138
T
+5 V
BAT T
MBM27128 (Control unit IC52)
---~
—~ O
lO x
— I/O Dolt) —
Data outpu t
00 0 7
'
~~ —
+15 V
Vcc
RD
GN D
VPP
pPD7800
17
Pin nam e
+15 V
--.-
v
Y0 0 Yt
O
15
14
SN74LSI38
O E
C E
PG M
o A O
Aa
Output enabl e
Chip enabl e
P rog, roglc
Y decoder
X decoder
Output Buffe r
Y selection
131072
bi t
(512 x 256 )
Memoria l
all y
}BP D
7800
Ao—A 13 Address inpu t
Oo
— O7 Data outpu t
CE Chip enable inpu t
OE Output enable inpu t
PGM
Program inpu t
Vcc
Power suppl y
Vpp Program power suppl y
GND
GN D
30