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AK536256D PDF预览

AK536256D

更新时间: 2024-10-31 04:32:07
品牌 Logo 应用领域
ACCUTEK 存储
页数 文件大小 规格书
2页 113K
描述
262,144 X 8 Bit MOS Dynamic Random Access Memory

AK536256D 数据手册

 浏览型号AK536256D的Datasheet PDF文件第2页 
Accutek  
Microcircuit  
Corporation  
AK48256S / AK48256G  
262,144 X 8 Bit MOS  
Dynamic Random Access Memory  
DESCRIPTION  
Front View  
30-Pin SIM  
The Accutek AK48256 high density memory modules is a random  
access memory organized in 256K x 8 bit words. The assembly  
consists of eight standard 256K x 1 DRAMs in plastic leaded chip  
carriers (PLCC) mounted on the front side of a printed circuit board.  
The module can be configured as a leadless 30 pad SIM or a leaded  
30 pin SIP. This packaging approach provides a 6 to 1 density in-  
crease over standard DIP packaging.  
1
30  
30-Pin SIP  
The operation of the AK48256 is identical to eight 256K x 1 DRAMs.  
The data input is tied to the data output and brought out separately  
for each device, with common RAS, CAS and WE control. This  
common I/O feature dictates the use of early-write cycles to prevent  
contention of D and Q. Since the Write-Enable (WE) signal must al-  
ways go low before CAS in a write cycle, Read-Write and  
Read-Modify-Write operation is not possible.  
1
FEATURES  
· 262,144 by 8 bit organization  
· Optional 30 Pad leadless SIM (Single In-Line Module) or 30  
Pin leaded SIP (Single In-Line Package)  
· JEDEC standard pinout  
· Each device has common D and Q lines with common RAS,  
CAS and WE control  
· 2.8 Watt active and 180 mW standby (max)  
· Operating free air temperature 00C to 700C  
· Upward compatible with AK481024, AK581024, AK584096 and  
AK5816384  
· Functionally and Pin compatible with AK58256A  
PIN NOMENCLATURE  
PIN ASSIGNMENT  
FUNCTIONAL DIAGRAM  
PIN #  
1
SYMBOL  
Vcc  
CAS  
DQ!  
A0  
PIN #  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
SYMBOL  
A0 - A8  
DQ1 - DQ8  
CAS  
Address Inputs  
DQ5  
A8  
Data In / Data Out  
Column Address Strobe  
Row Address Strobe  
Write Enable  
2
3
NC  
4
NC  
RAS  
5
A1  
DQ6  
WE  
Vss  
DQ7  
NC  
WE  
6
DQ2  
A2  
7
Vcc  
5v Supply  
8
A3  
Vss  
Ground  
9
Vss  
DQ3  
A4  
NC  
No Connect  
10  
11  
12  
13  
14  
15  
DQ8  
NC  
A5  
RAS  
NC  
MODULE OPTIONS  
DQ4  
A6  
NC  
Leadless SIM: AK48256S  
Leaded SIP: AK48256G  
A7  
Vcc  

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