DESCRIPTION
The Accutek AK536512W high density memory module is a CMOS
dynamic RAM organized in 512K x 36 bit words. The module con-
sists of sixteen standard 256K x 4 DRAMs in plastic SOJ packages
and eight 256K x 1 DRAMs in PLCC packages. The assembly has
12 drams mounted on each side of a printed circuit board in a 72 pad
leadless SIM configuration.
This configuration allows socket-mounting of large quantities of
memory in applications where high density and ease of inserting ad-
ditional memory are important.
The operation of the AK536512 is identical to sixteen 256K x 4 plus
eight 256K x 1 DRAMs. There are four CAS lines and four RAS
lines. On each bank of 256K x 36, independent byte control is ac-
complished by four CAS lines. Each separate CAS line controls
four 256K x 4 DRAMs and two 256K x 1 DRAMs with data in tied to
data out to form a 9 bit byte. Two banks of 36 bits are controlled by
the two pairs of RAS lines. An eighteen bit data path can be pro-
duced by connecting DQ0to DQ18,DQ
1to DQ19, etc. and alter-
nately strobing RAS0with RAS1and RAS2with RAS3.
FEATURES
·524,288 x 36 bit organization
·72 pad Single In-Line Module
·Multiple CAS and RAS lines allow x18 or x36 bit widths
·CAS-before-RAS refresh
·Operating free air temperature 0oCto70
oC
·Single 5 Volt Power Supply
·Power
5.41 Watt Max Active (70nS)
4.75 Watt Max Active (80 nS)
4.09 Watt Max Active (100 nS)
132 mW Max Standby
·512 Refresh Cycles, 8 mSEC
·Available in Fast Page Mode and Static Column Mode ver-
sions
·Downward compatible with AK536256W
·Upward compatible with AK5361024W, AK5362048W,
AK5364096W and AK5368192W
Accutek
Microcircuit
Corporation
AK536512W
524,288 Word by 36 Bit CMOS
Dynamic Random Access Memory
+
+
PIN NOMENCLATURE
DQ0-DQ
35 Data In/Data Out
A0-A
8Address Inputs
CAS0- CAS3Column Address Strobe
RAS0- RAS3Row Address Strobe
WE Write Enable
PD Presence Detect
Vcc 5v Supply
Vss Ground
NC No Connect
MODULE OPTIONS
Leadless SIM: AK536512W
Leaded ZIP: AK536512Z
PIN ASSIGNMENT
PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL
1 Vss 19 NC 37 DQ17 55 DQ12
2 DQ0 20 DQ4 38 DQ35 56 DQ30
3 DQ18 21 DQ22 39 Vss 57 DQ13
4 DQ1 22 DQ5 40 CAS0 58 DQ31
5 DQ19 23 DQ23 41 CAS2 59 Vcc
6 DQ2 24 DQ6 42 CAS3 60 DQ32
7 DQ20 25 DQ24 43 CAS1 61 DQ14
8 DQ3 26 DQ7 44 RAS0 62 DQ33
9 DQ21 27 DQ25 45 RAS1 63 DQ15
10 Vcc 28 A7 46 NC 64 DQ34
11 NC 29 NC 47 WE 65 DQ16
12 A0 30 Vcc 48 NC 66 NC
13 A1 31 A8 49 DQ9 67 PD1
14 A2 32 NC 50 DQ27 68 PD2
15 A3 33 RAS3 51 DQ10 69 PD3
16 A4 34 RAS2 52 DQ28 70 PD4
17 A5 35 DQ26 53 DQ11 71 NC
18 A6 36 DQ8 54 DQ29 72 Vss
Presence Detect -
-60 -70 -80
PD1 NC NC NC
PD2 Vss Vss Vss
PD3 NC Vss NC
PD4 NC NC Vss
FUNCTIONAL DIAGRAM
MECHANICAL DIMENSIONS
ACCUTEK MICROCIRCUIT CORPORATION
BUSINESS CENTER at NEWBURYPORT
2 NEW PASTURE ROAD, SUITE 1
NEWBURYPORT, MA 01950-4054
PHONE: 978-465-6200 FAX: 978-462-3396
E-Mail: 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.
C
LC
L
C
L
+
+
4.240"
4.260"
1.000"
MAX
0.330"
MAX
0.425"
0.375" 0.250"
C
L
0.080"
3.979"
3.989"
0.125" 0.050"
TYP
