ACCUTEK AK536256W 262,144 word by 36 bit cmos dynamic random access memory Datasheet

Accutek
Microcircuit
Corporation
AK536256W
262,144 Word by 36 Bit CMOS
Dynamic Random Access Memory
DESCRIPTION
The Accutek AK536256W high density memory module is a CMOS
dynamic RAM organized in 256K x 36 bit words. The module consists of eight standard 256K x 4 DRAMs in plastic SOJ packages
and four 256K x 1 DRAMs in PLCC packages. The assembly has
12 drams mounted on the front side of a printed circuit board in a 72
pad leadless SIM configuration.
+
+
The operation of the AK536256W is identical to eight 256K x 4 plus
four 256K x 1 DRAMs. There are four CAS lines and two RAS lines.
Independent byte control is accomplished by four CAS lines. Each
separate CAS line controls two 256K x 4 DRAMs, along with one
256K x 1 DRAM with data in tied to data out to form a 9 bit byte. The
bank of 36 bits is controlled by the two RAS lines. An eighteen bit
data path can be produced by connecting DQ0 to DQ18, DQ1 to
DQ19, etc. and alternately strobing RAS0 and RAS2.
FEATURES
·
·
·
·
·
·
262,144 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 0oC to 70oC
Single 5 Volt Power Supply
· Power
2.705 Watt Max Active (70nS)
2.375 Watt Max Active (80 nS)
2.045 Watt Max Active (100 nS)
66 mW Max Standby
· 512 Refresh Cycles, 8 mSEC
· Available in Fast Page Mode and Static Column Mode versions
· Upward compatible with AK536512W, AK5361024W,
AK5362048W, AK5364096W and AK5368192W
PIN NOMENCLATURE
PIN ASSIGNMENT
DQ0 - DQ35
Data In/Data Out
A0 - A8
Address Inputs
PIN #
1
CAS0 - CAS3
Column Address Strobe
RAS0, RAS2
WE
SYMBOL
Vss
PIN #
19
SYMBOL
NC
PIN #
37
SYMBOL
DQ17
PIN #
55
SYMBOL
DQ12
2
DQ0
3
DQ18
20
DQ4
38
DQ35
56
DQ30
21
DQ22
39
Vss
57
Row Address Strobe
4
DQ13
DQ1
22
DQ5
40
CAS0
58
Write Enable
DQ31
5
DQ19
23
DQ23
41
CAS2
59
Vcc
6
DQ2
24
DQ6
42
CAS3
60
DQ32
PD
Presence Detect
Vcc
5v Supply
7
DQ20
25
DQ24
43
CAS1
61
DQ14
8
DQ3
26
DQ7
44
RAS0
62
Vss
DQ33
Ground
9
DQ21
27
DQ25
45
NC
63
DQ15
NC
No Connect
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
NC
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
MODULE OPTIONS
Leadless SIM: AK536256W
Leaded ZIP: AK536256Z
Presence Detect PD1
-60
Vss
-70
Vss
-80
Vss
PD2
PD3
NC
NC
NC
NC
Vss
PD4
NC
NC
NC
Vss
FUNCTIONAL DIAGRAM
CAS0
RAS0
CAS1
A0
A1
A2
A3
A4
A5
A6
A7
A8
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
A0 - A8
RAS D
CAS
Q
WE
CAS2
RAS2
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
DQ9
DQ10
DQ11
DQ12
DQ13
DQ14
DQ15
DQ16
A0 - A8
RAS D
CAS
Q
WE
CAS3
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
DQ18
DQ19
DQ20
DQ21
DQ22
DQ23
DQ24
DQ25
A0 - A8
RAS D
CAS
Q
WE
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
A0 - A8
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4 OE
DQ27
DQ28
DQ29
DQ30
DQ31
DQ32
DQ33
DQ34
A0 - A8
RAS D
CAS
Q
WE
WE
DQ8
DQ17
DQ26
DQ35
MECHANICAL DIMENSIONS
4.240"
4.260"
0.200"
MAX
3.979"
3.989"
1.000"
MAX
0.425"
0.375"
+
+
0.250"
0.080"
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:
[email protected]
Internet:
www.accutekmicro.com
0.050"
TYP
0.125"
CL CL
CL CL
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.
Similar pages