Sanyo RB-7201 Service Manual page 44

IC BLOCK DIAGRAM & DESCRIPTION
IC201 T224162B(DRAM)
15
WE
CASL 31
CASH 30
A0 18
19
A1
A2 20
A3 21
A4
24
A5
25
A6
26
A7
27
A8
28
RAS 16
V
1
CC
I/O1
2
I/O2
3
I/O3
4
I/O4
5
V
6
CC
I/O5
7
I/O6
8
I/O7
9
I/O8
10
NC 13
NC 14
WE 15
RAS 16
NC 17
18
A0
A1 19
A2 20
A3 21
V 22
CC
CONTROL
LOGIC
NO.2 CLOCK
GENERATOR
COLUMN
ADDRESS
9
BUFFER
REFRESH
CONTROLLER
REFRESH
COUNTER
9
ROW
9 ADDRESS 9
BUFFER(9)
NO.1 CLOCK
GENERATOR
TSOP44
V
44
SS
I/O16
43
I/O15
42
I/O14
41
I/O13
40
PIN NO.
V
39 SS
16~19,22~26
I/O12
38
I/O11
37
I/O10
36
I/O9
35
32 NC
2~5,6~10,31~34,36~39
31 CASL
1,6,20
30
CASH
29
OE
21,35,40
28
A8
11,12,15,30
27 A7
A6
26
A5
25
24 A4
V
23 SS
Top view
DATA-IN BUFFER
DATA-OUT
BUFFER
COLUMN
9
DECODER
512
8 8
SENSE AMPLIFIERS
VO GATING
512x16
512x512x16
512
MEMORY
ARRAY
SYM. TYPE
A0~A8 Input Address Input
14 RAS Input Row Address Strobe
28 CASH Input Column Address Stlobe /Upper Byte Control
29 CASL Input Column Address Stlobe /Lower Byte Control
13 WE Input Write Enable
27 OE Input Output Enable
I/O1-I/O16 Input/Output Data Input /Output
V Supply Power, 5V
CC
V Ground Ground
SS
NC - No Connec
- 61 -
2~5 I/O1~I/O4
7~10 I/O7~I/O8
16
35~38 I/O9~I/O12
40~43 I/O13~I/O16
29 OE
16
6 V
CC
39 V
SS
DESCRIPTION