Pin Configuration; Dynamic Ram; Functional Diagram - Commodore MODEL PLUS 4 COMPUTER Service Manual

U3, US, U19 PINOUTS ON PAGE 8
PIN
CONFIGURATION
16
1
NC
2 15
DIN
14
WE 3
-
13
4
RAS -
12
5
A(JJ -
11
6
A2 -
10
7
A1
-
8
VCC -
U11 - 18
64K DYNAMIC RAM
901505-01
R/W CLOCK
-
WE
GENERATOR
RAS CLOCK
RAS
GENERATOR
CAS CLOCK
CAS
GENERATOR
,
A7 - -
/ AGo
CI)
CI) a::
w
/ w
CI)
LL.
CI)
LL.
w
::J
a::
ca
C
CI)
C
CI)
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c(
w
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:J:
C
CI)
w
C
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A0
v
-vss
COMMODORE
PART
-CAS
NUMBER
-DOUT
-A6
901505-01
-A3
901505-01
-A4
-A5
901505-01
9 -A7
901505-01
901505-01
901505-01
901505-01
901505-01
901505-01
901505-01
901505-01
R/W SWITCH
,
MEMORY
ARRAY
ROW DEC.
CI)
a..
:iE
~
MEMORY
c(
ARRAY
:J:
CI)
W
a::
LL.
W
a::
MEMORY
w
ARRAY
CI)
Z
W
CI)
ROW DEC.
MEMORY
ARRAY

FUNCTIONAL DIAGRAM

APPROVED VENDOR
PART
SOURCE 1
OF SUPPLY NUMBER
HITACHI HM4864-3
NEC !-,PD4164-2
MITSUBISHI M5K416NS-20
MOSTEK MK4564N-20
MSM3764-20
OKI
HITACHI HM4864P-3
MATSUSHITA
MN4164P-20
(PANASONIC)
HYB4164-3
SIEMENS
LH2164-Z1
SHARP
HM4864AP-3
HIT ACHI
TMM4164AP-20
TOSHIBA
;
•
U
w
MEMORY
C
....
•
ARRAY
0
U
~
ROW DEC. CI)
a..
•
:iE
U
MEMORY
c(
CI) ~
..i ~
w ARRAY ~
0
W
CI) CI)
a::
U
CI) CI)
::J • ::J
LL.
ca
U CIl
W
o
a::
0
W
;;;;;C ;;;;; MEMORY
w
~ ARRAY ~
U
W
CI)
ROW DEC.
l/l
'"
....
•
U
w
MEMORY
C
....
•
ARRAY
0
u
•
ACCESS
TIME CYCLES
ACTIVE
(ns) (ns)
(MW)
335 330
200
200 375 250
330 275
200
345 300
200
200 330 248
335 330
200
275
200 330
200 330 150
200 330 248
200 330 242
200 330 275
DATA IN
DIN
()
BUFFER
DATA OUT
DOUT
BUFFER
•
VCC
---.0
VSS
---.-0
ATOR
VBB GENER
POWER
STANDBY
(MAX)(MW)
20
28
28
22
23
20
27.5
20
28
20
22