AK644096W [ACCUTEK]
262,144 X 8 Bit MOS Dynamic Random Access Memory; 262144 ×8位CMOS动态随机存取存储器型号: | AK644096W |
厂家: | ACCUTEK MICROCIRCUIT CORPORATION |
描述: | 262,144 X 8 Bit MOS Dynamic Random Access Memory |
文件: | 总2页 (文件大小:113K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Accutek
Microcircuit
Corporation
AK48256S / AK48256G
262,144 X 8 Bit MOS
Dynamic Random Access Memory
DESCRIPTION
Front View
30-Pin SIM
The Accutek AK48256 high density memory modules is a random
access memory organized in 256K x 8 bit words. The assembly
consists of eight standard 256K x 1 DRAMs in plastic leaded chip
carriers (PLCC) mounted on the front side of a printed circuit board.
The module can be configured as a leadless 30 pad SIM or a leaded
30 pin SIP. This packaging approach provides a 6 to 1 density in-
crease over standard DIP packaging.
1
30
30-Pin SIP
The operation of the AK48256 is identical to eight 256K x 1 DRAMs.
The data input is tied to the data output and brought out separately
for each device, with common RAS, CAS and WE control. This
common I/O feature dictates the use of early-write cycles to prevent
contention of D and Q. Since the Write-Enable (WE) signal must al-
ways go low before CAS in a write cycle, Read-Write and
Read-Modify-Write operation is not possible.
1
FEATURES
· 262,144 by 8 bit organization
· Optional 30 Pad leadless SIM (Single In-Line Module) or 30
Pin leaded SIP (Single In-Line Package)
· JEDEC standard pinout
· Each device has common D and Q lines with common RAS,
CAS and WE control
· 2.8 Watt active and 180 mW standby (max)
· Operating free air temperature 00C to 700C
· Upward compatible with AK481024, AK581024, AK584096 and
AK5816384
· Functionally and Pin compatible with AK58256A
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
PIN #
1
SYMBOL
Vcc
CAS
DQ!
A0
PIN #
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
SYMBOL
A0 - A8
DQ1 - DQ8
CAS
Address Inputs
DQ5
A8
Data In / Data Out
Column Address Strobe
Row Address Strobe
Write Enable
2
3
NC
4
NC
RAS
5
A1
DQ6
WE
Vss
DQ7
NC
WE
6
DQ2
A2
7
Vcc
5v Supply
8
A3
Vss
Ground
9
Vss
DQ3
A4
NC
No Connect
10
11
12
13
14
15
DQ8
NC
A5
RAS
NC
MODULE OPTIONS
DQ4
A6
NC
Leadless SIM: AK48256S
Leaded SIP: AK48256G
A7
Vcc
ORDERING INFORMATION
MECHANICAL DIMENSIONS
PART NUMBER CODING INTERPRETATION
5
Inches
1
2
3
4
6
7
8
Position
1
Product
AK
= Accutek Memory
2
Type
4 = Dynamic RAM
5 = CMOS Dynamic RAM
6 = Static RAM
3
Organization/Word Width
1 = by 1 16 = by 16
4 = by 4 32 = by 32
8 = by 8 36 = by 36
9 = by 9
4
Size/Bits Depth
64 = 64K
4096 = 4 MEG
8192 = 8 MEG
1024 = 1 MEG 16384 = 16 MEG
256 = 256K
5
Package Type
G = Single In-Line Package (SIP)
S = Single In-Line Module (SIM)
D = Dual In-Line Package (DIP)
W = .050 inch Pitch Edge Connect
Z = Zig-Zag In-Line Package (ZIP)
6
Special Designation
P = Page Mode
N = Nibble Mode
K = Static Column Mode
W = Write Per Bit Mode
V = Video Ram
7
Separator
-
= Commercial 00C to +700C
M = Military Equivalent Screened
(-550C to +1250C)
I
= Industrial Temperature Tested
(-450C to +850C)
X = Burned In
0.100
TYP
8
Speed (first two significant digits)
SRAMS
DRAMS
50
60
70
80
=
=
=
=
50 nS
60 nS
70 nS
80 nS
8
10
12
15
=
=
=
=
8 nS
10 nS
12 nS
15 nS
The numbers and coding on this page do not include all variations
available but are show as examples of the most widely used variations.
Contact Accutek if other information is required.
EXAMPLES:
AK48256SP-10
256K x 8, 100 nSEC DRAM 30 pin SIM Configuration, Page Mode
AK48256GK-80
256K x 8, 80 nSEC DRAM 30 pin SIP Configuration, Static Column Mode
ACCUTEK MICROCIRCUIT CORPORATION
BUSINESS CENTER at NEWBURYPORT
2 NEW PASTURE ROAD, SUITE 1
NEWBURYPORT, MA 01950-4054
VOICE: 978-465-6200 FAX: 978-462-3396
Accutek reserves the right to make changes in specifications at any
time and without notice. Accutek does not assume any responsibil-
ity for the use of any circuitry described; no circuit patent licenses
are implied. Preliminary data sheets contain minimum and maxi-
mum limits based upon design objectives, which are subject to
change upon full characterization over the specific operating condi-
tions.
Email: sales@accutekmicro.com
Internet: www.accutekmicro.com
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