AK532256W Datasheet, PDF (1/2 Pages) ACCUTEK MICROCIRCUIT CORPORATION – 262,144 Word by 32 Bit CMOS Dynamic Random Access Memory

Accutek
Microcircuit
Corporation
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.
FEATURES
· 262,144 x 32 bit organization
· 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 0^oC to 70^oC
· Single 5 Volt Power Supply
· 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
AK532256W
262,144 Word by 32 Bit CMOS
Dynamic Random Access Memory
+
+
· Available in Fast Page Mode, EDO and Static Column Mode
versions
· Available in leadless SIM or leaded Zip versions
· Upward compatible with AK532512, AK5321024, AK5322048,
AK5324096 and AK5328192
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
PIN NOMENCLATURE
A0 - A8
DQ1 - DQ32
CAS0 - CAS3
RAS0, RAS2
WE
PD1 - PD4
Vcc
Vss
NC
Address Inputs
Data In/Data Out
Column Address Strobe
Row Address Strobe
Write Enable
Presence Detect
5v Supply
Ground
No Connect
MODULE OPTIONS
Leadless SIM: AK532256W
Leaded ZIP: AK532256WZ
PIN ASSIGNMENT
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
SYMBOL
Vss
D1
DQ17
DQ2
DQ18
DQ3
DQ19
DQ4
DQ20
Vcc
NC
A0
A1
A2
A3
A4
A5
A6
Presence Detect -
-60
PD1
Vss
PD2
NC
PD3
NC
PD4
NC
PIN #
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
-70
Vss
NC
Vss
NC
SYMBOL
NC
DQ5
DQ21
DQ6
DQ22
DQ7
DQ23
DQ8
DQ24
A7
NC
Vcc
A8
NC
NC
RAS2
NC
NC
-80
Vss
NC
NC
Vss
PIN #
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
SYMBOL
NC
NC
Vss
CAS0
CAS2
CAS3
CAS1
RAS0
NC
NC
WE
NC
DQ9
DQ25
DQ10
DQ26
DQ11
DQ27
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
DQ30
DQ14
DQ31
DQ15
DQ32
DQ16
NC
PD1
PD2
PD3
PD4
NC
Vss