OKI MSM6685JS Datasheet
E2D0037-27-41
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•
Previous version: May. 1997
This version: Jan. 1998
MSM6685
MSM6685
8,388,608-Word x 1-Bit Serial Register
GENERAL DESCRIPTION
The MSM6685 is a serial register composed of 8,388,608 words x one bit, characterized by mediumspeed, low power consumption operation.
This device has a built-in internal address generation circuit allowing continuous serial read/write
operation by external clock input. Read/write operation causes the internal address to be incremented
automatically by +1.
External address input enables addressing in units of 1024 words. Furthermore, a refresh timer and
a refresh address counter are installed, which makes an external refresh circuit unnecessary. In
addition, this configuration allows lower power consumption.
The device is packaged in 26-pin SOJ having a width of 300 mil.
It is well adapted for storing much data by means of a battery backup. Its combination with OKI's
recording and playback IC enables the easy implementation of a solid recording and playback
system.
FEATURES
• Configuration : 8,388,608 ¥ 1 bit
• Serial access operation
Serial access time : 1.5 ms
Serial read/write time : 2.5 ms
• Low current drain : 200 mA max. (VCC = 4 V, at refresh operation, with
data stored and under standard conditions)
• Refresh operation
A self-refresh function is supported.
• Wide range of operating voltage : Single 3.5 to 5.5 V supply
• Addressing : In units of 1024 words
• Process : 0.5 mm double well CMOS process
• Package:
26/20-pin plastic SOJ (SOJ26/20-P-300-1.27) (Product name : MSM6685JS)
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BLOCK DIAGRAM
Refresh Timer
Refresh Address
Counter
TAS
Row Address
Counter
Address
Multiplexer
MSM6685
8,388,608
Data Register
Row Decoder
SAD
SAS
RWSK
Row Address
Register
Timing
Generator
Column Decoder
Column Address
Counter
Write Clock
Generator
I/O Control
DIN
DOUT
WE
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PIN CONFIGURATION (TOP VIEW)
MSM6685
TEST
RWCK
NC
TEST
TEST
TEST
TEST
DIN
NC
V
SS
1
2
3
4
5
9
10
11
12
13
NC : No connection
26
25
24
23
22
18
17
16
15
14
V
CC
TEST
TEST
SAD
SAS
TAS
CS
WE
DOUT
NC
PIN DESCRIPTION
Pin
25
1, 4, 5
9, 10, 24
Symbol
TEST
TEST
RWCK
DIN
V
SS
DOUT
WE
CS
TAS
SAS
SAD
V
CC
26/20-Pin Plastic SOJ
Description
Test input
Test input
Read/write clock2
Data input11
Ground (0 V)13
Data output15
Write enable16
Chip select17
Transfer address strobe18
Serial address strobe22
Serial address data23
Power supply (5 V)26
Note : All TEST pins are to be connected to the power supply.
The TEST pin is to be referenced to the ground level.
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