Specifications

2-35 2-36
IC903 RH-iX2840AFZZ: 16Mbit SDRAM (IX2840AF)
1 VCC Power supply (3.3V)
2-5 DQ1-DQ4 Data input/output
6 WE Write enable
7 RAS Row address strobe
8* NC Not used
9 A10R Address input
10-13 A0-A3 Address input
14 VCC Power supply (3.3V)
15 VSS Ground (0V)
16-21 A4-A9 Address input
22 OE Output enable
23 CAS Column address strobe
24-27 DQ5-Q8 Data input/output
28 VSS Ground (0V)
Pin No. Terminal Name Function
In this unit, the terminal with asterisk mark (*) is (open)
terminal which is not connected to the outside.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
DQ1
DQ2
DQ3
DQ4
WE
RAS
NC
A10R
A0
A1
A2
A3
V
CC
V SS
DQ8
DQ7
DQ6
DQ5
CAS
OE
A9
A8
A7
A6
A5
A4
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
DQ1
DQ2
DQ3
DQ4
WE
RAS
NC
A10R
A0
A1
A2
A3
V
CC
V SS
DQ8
DQ7
DQ6
DQ5
CAS
OE
A9
A8
A7
A6
A5
A4
V
SS
28 pin plastic SOJ
28 pin plastic TSOP
(Type K)
10
10
10
11
1
8
8
8
8
8
8
DQ1~DQ8
OEWE
RAS
CAS
A0~A9
A10R
V
CC
VSS
VCC
VSS
TIMING
GENERATOR
INPUT/OUTPUT
CONTROL UNIT
COLUMN /
ADDRESS
BUFFER
COLUMN ¥
DECODER
INTERNAL
ADDRESS
COUNTER
REFRESH
MASTER CLOCK
SENSE AMPLIFIER
INPUT/
OUTPUT
SELECTOR
ROW
ADDRESS
BUFFER
ROW
DECODER
WORD
DRIVER
MEMORY
CELL
ON CHIP
VCC GENERATOR
OUTPUT
BUFFER
INPUT
BUFFER
2.6 EXPLODED VIEW AND PARTS LIST
321
342
711
344
718x2
315
711
344
340
711x4
316
320
341
718x2
712
324
711
M703 710
329
711x2
317
719x2
328
715
711x4
716
327
326
318
711x2
SW52
SW51
711x2
325
325
303
301
309x2
701x2
312x2
701x2
714
319
322
345
323
346
709
713x2
PWB-D2
PWB-D1
717x2
717
717
717x3
343
705x2
313
308
PWB-D3