Accutek
Microcircuit
Corporation
AK532256W
262,144 Word by 32 Bit CMOS
Dynamic Random Access Memory
DESCRIPTION
The Accutek AK532256W high density memory module is a CMOS
dynamic RAM organized in 256K x 32 bit words. The module con-
sists of eight standard 256K x 4 DRAMs in plastic SOJ packages.
The assembly has eight drams mounted on the front side of a
printed circuit board in a 72 pad leadless SIM configuration.
The operation of the AK532256W is identical to eight 256K x 4
DRAMs. There are four CAS lines and two RAS lines. Independent
byte control is accomplished by four CAS lines. Each seperate CAS
line controls two 256K x 4 Drams to form an 8 bit byte. The bank of
32 bits is controlled by the two RAS lines. A sixteen bit data path can
be produced by connecting DQ1 to DQ17, DQ2 to DQ18 and alter-
nately strobing RAS0 with RAS2.
+
+
+
· Available in Fast Page Mode, EDO and Static Column Mode
versions
FEATURES
· Available in leadless SIM or leaded Zip versions
· 262,144 x 32 bit organization
· Upward compatible with AK532512, AK5321024, AK5322048,
AK5324096 and AK5328192
· 72 pin Single In-Line Module
· Multiple CAS and RAS lines allow x16 or x32 bit widths
· CAS-before-RAS Refresh, RAS-only Refresh or Hidden refresh
· Operating free air temperature 0oC to 70oC
· Single 5 Volt Power Supply
ADDITIONAL OPTIONS AVAILABLE
· 512K x 32 version, AK532512
· 1 Meg x 32 version, AK5321024
· 2 Meg x 32 version, AK5322048
· 4 Meg x 32 version, AK5324096
· 8 Meg x 32 version, AK5328192
· 512 Refresh Cycles, 8mSEC
· Power
2.00 Watt Max Active (60nS)
1.78 Watt Max Active (70 nS)
1.562 Watt Max Active (80 nS)
44 mW Max Standby
PIN NOMENCLATURE
PIN ASSIGNMENT
A0 - A8
Address Inputs
PIN #
1
SYMBOL
Vss
PIN #
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
SYMBOL
NC
PIN #
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
SYMBOL
NC
PIN #
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
SYMBOL
DQ12
DQ28
DQ13
DQ29
Vcc
DQ1 - DQ32
CAS0 - CAS3
RAS0, RAS2
WE
Data In/Data Out
Column Address Strobe
Row Address Strobe
Write Enable
2
D1
DQ5
DQ21
DQ6
DQ22
DQ7
DQ23
DQ8
DQ24
A7
NC
3
DQ17
DQ2
DQ18
DQ3
DQ19
DQ4
DQ20
Vcc
Vss
4
CAS0
CAS2
CAS3
CAS1
RAS0
NC
5
6
DQ30
DQ14
DQ31
DQ15
DQ32
DQ16
NC
7
8
PD1 - PD4
Vcc
Presence Detect
5v Supply
9
10
11
12
13
14
15
16
17
18
NC
NC
NC
WE
Vss
Ground
A0
Vcc
NC
A1
A8
DQ9
DQ25
DQ10
DQ26
DQ11
DQ27
PD1
NC
No Connect
A2
NC
PD2
A3
NC
PD3
A4
RAS2
NC
PD4
MODULE OPTIONS
A5
NC
A6
NC
Vss
Leadless SIM: AK532256W
Leaded ZIP: AK532256WZ
Presence Detect -
-60
-70
-80
PD1
PD2
PD3
PD4
Vss
NC
NC
NC
Vss
NC
Vss
NC
Vss
NC
NC
Vss