AK536256W
262,144 Word by 36 Bit CMOS
Dynamic Random Access Memory
ACCUTEK
MICROCIRCUIT CORPORATION
DESCRIPTION
The Accutek AK536256W high density memory module is a CMOS
dynamic RAM organized in 256K x 36 bit words. The module con-
sists of eight standard 256K x 4 DRAMs in plastic SOJ packages
and four 256K x 1 DRAMs in PLCC packages. The assemblyhas 12
drams mounted on the front side of a printed circuit board in a 72 pad
leadless SIM configuration.
+
+
1
72
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
· Power
2.375 Watt Max Active (80 nS)
2.045 Watt Max Active (100 nS)
66 mW Max Standby
· 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
2.705 Watt Max Active (70nS)
· 512 Refresh Cycles, 8 mSEC
· Operating free air temperature 0oC to 70oC
· Single 5 Volt Power Supply
· Available in Fast Page Mode and Static Column Mode versions
· Upward compatible with AK536512W, AK5361024W,
AK5362048W, AK5364096W and AK5368192W
PIN NOMENCLATURE
PIN ASSIGNMENT
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
DQ0 - DQ35
A0 - A8
CAS0 - CAS3
RAS0, RAS2
WE
Data In/Data Out
1
Vss
19
NC
37
DQ17
55
DQ12
Address Inputs
Column Address Strobe
Row Address Strobe
Write Enable
2
3
DQ0
DQ18
DQ1
DQ19
DQ2
DQ20
DQ3
DQ21
Vcc
NC
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
DQ4
DQ22
DQ5
DQ23
DQ6
DQ24
DQ7
DQ25
A7
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
DQ35
Vss
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
DQ30
DQ13
DQ31
Vcc
4
CAS0
CAS2
CAS3
CAS1
RAS0
NC
5
6
DQ32
DQ14
DQ33
DQ15
DQ34
DQ16
NC
PD
Presence Detect
5v Supply
7
Vcc
8
Vss
Ground
9
10
11
12
13
14
15
16
17
18
NC
NC
No Connect
NC
WE
A0
Vcc
NC
MODULE OPTIONS
A1
A8
DQ9
DQ27
DQ10
DQ28
DQ11
DQ29
PD1
A2
NC
PD2
Leadless SIM: AK536256W
Leaded ZIP: AK536256Z
A3
NC
PD3
A4
RAS2
DQ26
DQ8
PD4
A5
NC
A6
Vss
Presence Detect -
-60
-70
-80
PD1
PD2
PD3
PD4
Vss
NC
NC
NC
Vss
NC
Vss
NC
Vss
NC
NC
Vss