ACCUTEK AK59256AG

Accutek
Microcircuit
Corporation
AK59256AS / AK59256AG
262,144 Word by 9 bit, CMOS
Dynamic Random Access Memory
DESCRIPTION
Front View
The Accutek AK59256A high density memory modules is a random
access memory organized in 256K x 9 bit words. The assembly
consists of two 256K x 4 and one 256K x 1 DRAMs in surface mount
packages mounted to 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 better than 6 to 1 density increase over standard DIP packaging.
30-Pin SIM
+
· 262,144 x 9 bit organization
· Optional 30 Pad SIM (Single In-Line Module) or 30 Pin leaded
SIP (Single In-Line Package)
· JEDEC standard pinout
30
30-Pin SIP
The operation of the AK59256A is identical to two 256K x 4 DRAMs
plus one 256K x 1 DRAM. For the lower eight bits data input is tied
to data output and brought out separately for each 256K x 4 device,
with common RAS, CAS and WE control. The OE pins are tied to
Vss which 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
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
+
+
1
· Power:
1.26 Watt Max Active (70 nSEC)
1.10 Watt Max Active (80 nSEC)
.935 Wat Max Active (100 nSEC)
22 mWatt Standby (Max)
· Operating free air temperature: 0o to 70oC
· Common CAS, RAS and WE control for the lower eight bits
· Upward compatible with AK491024, AK591024, AK594096
and AK5916384
· Separate PCAS control for D9 and Q9
· Functionally and Pin compatible with AK49256
· Available with access times of 60 nSEC to 100 nSEC
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
PIN #
SYMBOL
PIN #
SYMBOL
1
Vcc
16
DQ5
DQ1 - DQ8
Data In / Data Out
D9
Data In
2
CAS
17
A8
Q9
Data Out
3
DQ1
18
NC
A0 - A9
Address Inputs
4
A0
19
NC
5
A1
20
DQ6
CAS, PCAS
Column Address Strobe
6
DQ2
21
WE
RAS
Row Address Strobe
7
A2
22
Vss
8
A3
23
DQ7
9
Vss
24
NC
WE
Write Enable
Vcc
5v Supply
10
DQ3
25
DQ8
Vss
Ground
11
A4
26
Q9
NC
No Connect
MODULE OPTIONS
12
A5
27
RAS
13
DQ4
28
PCAS
14
A6
29
D9
15
A7
30
Vcc
A0 - A8 +
RAS +
CAS +
WE +
DQ1 +
DQ2 +
DQ3 +
DQ4 +
A0 - A8
* RAS
* CAS
* WE
* DQ1
* DQ2
* DQ3
* DQ4
OE
*
+
+
+
+
A0 - A8
* RAS
* CAS
* WE
* DQ1
* DQ2
* DQ3
* DQ4
OE
*
DQ5
DQ6
DQ7
DQ8
PCAS +
Leadless SIM: AK59256AS
A0 - A8
* RAS
* CAS
* WE
Leaded SIP: AK59256AG
D9 +
Q9 +
*D
Q *
MECHANICAL DIMENSIONS
ORDERING INFORMATION
PART NUMBER CODING INTERPRETATION
Position
1
2
3
6
Inches
7
8
0.410
0.390
0.260
0.240
0.085
0.075
0.325
0.275
1
+
+
1
0.100
T.P.
3.510
3.490
3.245
3.225
3.110
3.090
30
+
+
Product
AK = Accutek Memory
Type
4 = Dynamic RAM
5 = CMOS Dynamic RAM
6 = Static RAM
Organization/Word Width
1 = by 1 16 = by 16
4 = by 4 32 = by 32
8 = by 8 36 = by 36
9 = by 9
Size/Bits Depth
64 = 64K
4096 = 4 MEG
256 = 256K
8192 = 8 MEG
1024 = 1 MEG 16384 = 16 MEG
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)
Special Designation
P = Page Mode
N = Nibble Mode
K = Static Column Mode
W = Write Per Bit Mode
V = Video Ram
Separator
- = Commercial 00C to +700C
M = Military Equivalent Screened
(-550C to +1250C)
I = Industrial Temperature Tested
(-450C to +850C)
X = Burned In
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
0.024
0.016
8
5
0.100
T.P.
7
4
0.505
0.495
6
3
0.100
TYP
5
2
0.515
0.505
4
1
0.100
TYP
0.200"
MAX
0.053
0.047
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:
AK59256AGP-60
256K x 9, 60 nSEC, DRAM, SIP Configuration, 30 Pin, Page Mode
AK59256ASP-70
256K x 9, 70 nSEC, DRAM, SIM Configuration, 30 Pin, Page 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
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 responsibility for the use of any circuitry described; no circuit patent licenses
are implied. Preliminary data sheets contain minimum and maximum limits based upon design objectives, which are subject to
change upon full characterization over the specific operating conditions.