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 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 DQ
0
to DQ
18
, DQ
1
to
DQ
19
, etc. and alternately strobing RAS
0
and RAS
2
.
ACCUTEK
AK536256W
262,144 Word by 36 Bit CMOS
Dynamic Random Access Memory
+
1
+
72
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 0
o
C to 70
o
C
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
DQ
0
- DQ
35
A
0
- A
8
CAS
0
- CAS
3
RAS
0,
RAS
2
WE
PD
Vcc
Vss
NC
Data In/Data Out
Address Inputs
Column Address Strobe
Row Address Strobe
Write Enable
Presence Detect
5v Supply
Ground
No Connect
PIN ASSIGNMENT
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
SYMBOL
Vss
DQ0
DQ18
DQ1
DQ19
DQ2
DQ20
DQ3
DQ21
Vcc
NC
A0
A1
A2
A3
A4
A5
A6
PIN #
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
SYMBOL
NC
DQ4
DQ22
DQ5
DQ23
DQ6
DQ24
DQ7
DQ25
A7
NC
Vcc
A8
NC
NC
RAS2
DQ26
DQ8
PIN #
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
SYMBOL
DQ17
DQ35
Vss
CAS0
CAS2
CAS3
CAS1
RAS0
NC
NC
WE
NC
DQ9
DQ27
DQ10
DQ28
DQ11
DQ29
PIN #
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
SYMBOL
DQ12
DQ30
DQ13
DQ31
Vcc
DQ32
DQ14
DQ33
DQ15
DQ34
DQ16
NC
PD1
PD2
PD3
PD4
NC
Vss
MODULE OPTIONS
Leadless SIM: AK536256W
Leaded ZIP: AK536256Z
Presence Detect -
PD1
PD2
PD3
PD4
-60
Vss
NC
NC
NC
-70
Vss
NC
Vss
NC
-80
Vss
NC
NC
Vss
ACCUTEK [ ACCUTEK MICROCIRCUIT CORPORATION ]
