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
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