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AK536256W_09 PDF预览

AK536256W_09

更新时间: 2024-10-31 12:55:55
品牌 Logo 应用领域
ACCUTEK 存储
页数 文件大小 规格书
2页 82K
描述
Dynamic Random Access Memory

AK536256W_09 数据手册

 浏览型号AK536256W_09的Datasheet PDF文件第2页 
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  

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