Dear customers,
About the change in the name such as "Oki Electric Industry Co. Ltd." and
"OKI" in documents to OKI Semiconductor Co., Ltd.
The semiconductor business of Oki Electric Industry Co., Ltd. was succeeded to OKI
Semiconductor Co., Ltd. on October 1, 2008.
Therefore, please accept that although
the terms and marks of "Oki Electric Industry Co., Ltd.", “Oki Electric”, and "OKI"
remain in the documents, they all have been changed to "OKI Semiconductor Co., Ltd.".
It is a change of the company name, the company trademark, and the logo, etc. , and
NOT a content change in documents.
October 1, 2008
OKI Semiconductor Co., Ltd.
550-1 Higashiasakawa-cho, Hachioji-shi, Tokyo 193-8550, Japan
http://www.okisemi.com/en/
E2L0044-17-Y1
¡ Semiconductor
MSM548512L
¡ Semiconductor
524,288-Word
¥
8-Bit High-Speed PSRAM
This version: Jan. 1998
MSM548512L
Previous version: Dec. 1996
DESCRIPTION
The MSM548512L is fabricated using OKI’s CMOS silicon gate process technology. This process,
coupled with single-transister memory storage cells, permits maximum circuit density, minimum
chip size and high speed.
MSM548512L has Self-refresh mode in addition to Address-refresh mode and Auto-refresh
mode. In the Self-refresh mode the internal refresh timer and address counter refresh the
dynamic memory cells automatically. This series allows low power consumption when using
standby mode with Self-refresh.
The MSM548512L also features a static RAM-like write function that writes the data into the
memory cell at the rising edge of
WE.
FEATURES
• Large capacity
• Fast access time
• Low power
• Refresh free
• Logic compatible
• Single power supply
• Refresh
• Package compatible
• Package options:
32-pin 600 mil plastic DIP
32-pin 525 mil plastic SOP
:
:
:
:
:
:
:
:
4-Mbit (524,288-word
¥
8 bits)
80 ns max.
200
µA
max. (standby with Self-refresh)
Self refresh
SRAM
WE
pin, no address multiplex
5 V
±10%
2048 cycle/32 ms auto-address refresh
SRAM standard package
(DIP32-P-600-2.54)
(Product : MSM548512L-xxRS)
(SOP32-P-525-1.27-K) (Product : MSM548512L-xxGS-K)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM548512L-80RS
MSM548512L-10RS
MSM548512L-12RS
MSM548512L-80GS-K
MSM548512L-10GS-K
MSM548512L-12GS-K
Access Time (Max.)
80 ns
100 ns
120 ns
80 ns
100 ns
120 ns
525 mil 32-pin
Plastic SOP
600 mil 32-pin
Plastic DIP
Package
1/12
¡ Semiconductor
MSM548512L
PIN CONFIGURATION (TOP VIEW)
A
18
1
A
16
2
A
14
3
A
12
4
A
7
5
A
6
6
A
5
7
A
4
8
A
3
9
A
2
10
A
1
11
A
0
12
I/O
0
13
I/O
1
14
I/O
2
15
V
SS
16
32-Pin Plastic DIP
32 V
CC
31 A
15
30 A
17
29
WE
28 A
13
27 A
8
26 A
9
25 A
11
24
OE/RFSH
23 A
10
22
CE
21 I/O
7
20 I/O
6
19 I/O
5
18 I/O
4
17 I/O
3
A
18
1
A
16
2
A
14
3
A
12
4
A
7
5
A
6
6
A
5
7
A
4
8
A
3
9
A
2
10
A
1
11
A
0
12
I/O
0
13
I/O
1
14
I/O
2
15
V
SS
16
,
32-Pin Plastic SOP
32 V
CC
31 A
15
30 A
17
29
WE
28 A
13
27 A
8
26 A
9
25 A
11
24
OE/RFSH
23 A
10
22
CE
21 I/O
7
20 I/O
6
19 I/O
5
18 I/O
4
17 I/O
3
Pin Name
A
0
- A
18
I/O
0
- I/O
7
CE
OE/RFSH
WE
V
CC
V
SS
Function
Address Input
Data Input/Output
Chip Enable Input
Output Enable / Refresh Input
Write Enable Input
Power Voltage (5 V)
Ground (0 V)
2/12
¡ Semiconductor
MSM548512L
BLOCK DIAGRAM
A
0
Address
Latch
Control
A
10
Row
Decoder
Memory Matrix
(2048
¥
256)
¥
8
I/O
0
Input
Data
Control
Column I/O
Column Decoder
I/O
7
Address Latch Control
A
11
A
18
Refresh
Control
CE
Timing Pulse Generator
OE/RFSH
WE
Read/Write Control
3/12
¡ Semiconductor
MSM548512L
FUNCTION TABLE
CE
L
L
L
H
H
OE/RFSH
L
X
H
L
H
WE
H
L
H
X
X
I/O Pin
Low-Z
High-Z
High-Z
High-Z
High-Z
Mode
Read
Write
—
Refresh
Standby
L : Low Level Input
H : High Level Input
X : Don’t Care
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
Parameter
Voltage on Any Pin from V
SS
*1
Power Dissipation
Operating Temperature
Storage Temperature
Storage Temperature (biased)
Short Circuit Output Current
Symbol
V
T
P
D
T
opr
T
stg
T
bias
I
OS
Rating
–1.0 to 7.0
1.0
0 to 70
–55 to 125
–10 to 85
50
Unit
V
W
°C
°C
°C
mA
*1
Note:
To V
SS
1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are
exceeded. Functional operation should be restricted to the conditions as detailed
in the operational sections of this data sheet. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
(Ta = 0°C to 70°C)
Min.
4.5
0
2.4
–0.5
Typ.
5.0
0
—
—
Max.
5.5
0
6.0
0.8
Unit
V
V
V
V
Recommended Operating Conditions
Parameter
Power Supply Voltage
Input Voltage
Symbol
V
CC
V
SS
V
IH
V
IL
4/12