DESCRIPTION
The Accutek AK491024 high density memory module is a random
access memory organized in 1 Meg x 9 bit words. The assembly
consists of nine standard 1 Meg x 1 DRAMs in plastic leaded chip
carriers (SOJ) 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.
The operation of the AK491024 is identical to nine 1 Meg x 1
DRAMs. For the lower eight bits data input is tied to the data output
and brought out separately for each device, with common RAS,
CAS 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 always go low before CAS in a write
cycle, Read-Write and Read-Modify-Write operation is not possible.
For the ninth bit, the data input (D9) and the data output (Q9) pins are
brought out separately and controlled by a separate PCAS for that
bit. Bit nine is generally used for parity.
FEATURES
·1,048,576 x 9 bit organization
·Optional 30 Pad leadless SIM (Single In-Line Module) or 30
Pin leaded SIP (Single In-Line Package)
·JEDEC standard pinout
·Common CAS and RAS control for the lower eight bits
·Separate PCAS control for D9and Q9
·CAS-before-RAS refresh
·Power
3.465 Watt Max Active (80 nSEC)
2.97 Watt Max Active (100 nSEC)
2.475 Watt Max Active (120 nSEC)
49.5 mW Max Standby
·Operating free air temperature 00Cto70
0C
·Upward compatible with AK594096 and AK5916384
·Downward compatible with AK49256
Accutek
Microcircuit
Corporation
AK491024S / AK491024G
1,048,576 Word x 9 Bit CMOS
Dynamic Random Access Memory
130
1
Front View
30-Pin SIM
30-Pin SIP
PIN NOMENCLATURE
DQ1-DQ
8Data In / Data Out
D9Data In 9
Q9Data Out 9
A0-A
9Address Inputs
CAS, PCAS Column Address Strobe
RAS Row Address Strobe
WE Write Enable
Vcc 5v Supply
Vss Ground
NC No Connect
MODULE OPTIONS
Leadless SIM: AK491024S
Leaded SIP: AK491024G
PIN ASSIGNMENT
PIN # SYMBOL PIN # SYMBOL
1 Vcc 16 DQ5
2 CAS 17 A8
3 DQ1 18 A9
4A019NC
5 A1 20 DQ6
6 DQ2 21 WE
7 A2 22 Vss
8 A3 23 DQ7
9 Vss 24 NC
10 DQ3 25 DQ8
11 A4 26 Q9
12 A5 27 RAS
13 DQ4 28 PCAS
14 A6 29 D9
15 A7 30 Vcc
FUNCTIONAL DIAGRAM
ORDERING INFORMATION
PART NUMBER CODING INTERPRETATION
Position 12345678
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
256 = 256K 8192 = 8 MEG
1024 = 1 MEG 16384 = 16 MEG
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 00Cto+70
0C
M = Military Equivalent Screened
(-550C to +1250C)
I = Industrial Temperature Tested
(-450Cto+85
0C)
X = Burned In
8 Speed (first two significant digits)
DRAMS SRAMS
50 = 50 nS 8 = 8 nS
60 = 60 nS 10 = 10 nS
70 = 70 nS 12 = 12 nS
80 = 80 nS 15 = 15 nS
3.525
3.475
3.100
3.090
0.024
0.016
0.325
0.275
0.425
0.375
.100
.060
0.815
0.785
0.815
0.785
0.100
TYP
0.100
TYP
130
1
0.100
TYP
0.053
0.047
0.200
MAX
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
Email: sales@accutekmicro.com
Internet: www.accutekmicro.com
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.
MECHANICAL DIMENSIONS
Inches
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:
AK491024SP-80
1 Meg x 9, 80 nSEC DRAM 30 pin SIM Configuration, Page Mode
AK491024GN-70
1 Meg x 9, 70 nSEC Dram 30 pin SIP Configuration, Nibble Mode
