AK536256W Datasheet, PDF (1/2 Pages) ACCUTEK MICROCIRCUIT CORPORATION – 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 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 0^oC to 70^oC
· Single 5 Volt Power Supply
AK536256W
262,144 Word by 36 Bit CMOS
Dynamic Random Access Memory
+
+
· 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 ver-
sions
· Upward compatible with AK536512W, AK5361024W,
AK5362048W, AK5364096W and AK5368192W
PIN NOMENCLATURE
DQ₀ - DQ₃₅
A₀ - A₈
CAS₀ - CAS₃
RAS_0, RAS₂
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
MODULE OPTIONS
Leadless SIM: AK536256W
Leaded ZIP: AK536256Z
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
Presence Detect -
-60
-70
-80
PD1
Vss
Vss
Vss
PD2
NC
NC
NC
PD3
NC
Vss
NC
PD4
NC
NC
Vss
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