Datasheet > STK12C68-P35I

STK12C68-P35I

更新时间： 2024-10-28 20:21:47

品牌	Logo	应用领域
SIMTEK		可编程只读存储器电动程控只读存储器电可擦编程只读存储器静态存储器光电二极管内存集成电路
页数	文件大小	规格书
4页	36K
描述
Non-Volatile SRAM, 8KX8, 35ns, CMOS, PDIP28, 0.300 INCH, PLASTIC, DIP-28

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中文翻译

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技术参数
数据手册

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STK12C68-P35I 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP28,.3	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.32.00.41
风险等级：	5.2	Is Samacsys：	N
最长访问时间：	35 ns	其他特性：	STORE TO EEPROM SOFTWARE,HARDWARE, OR AUTOSTORE; RECALL SOFTWARE
JESD-30 代码：	R-PDIP-T28	JESD-609代码：	e0
长度：	34.67 mm	内存密度：	65536 bit
内存集成电路类型：	NON-VOLATILE SRAM	内存宽度：	8
功能数量：	1	端口数量：	1
端子数量：	28	字数：	8192 words
字数代码：	8000	工作模式：	ASYNCHRONOUS
最高工作温度：	85 °C	最低工作温度：	-40 °C
组织：	8KX8	输出特性：	3-STATE
可输出：	YES	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP28,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
并行/串行：	PARALLEL	峰值回流温度（摄氏度）：	240
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	4.57 mm	最大待机电流：	0.0015 A
子类别：	SRAMs	最大压摆率：	0.075 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn85Pb15)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	7.62 mm
Base Number Matches：	1

STK12C68-P35I 数据手册

Using nvSRAM in RAID

Controller Applications

evens out the number of I/O requests per disk and

greatly speeds up the disk access. The trouble with

disk tuning is that it requires a lot of system adminis-

tration time to accomplish, and when done, there is

no guarantee that it will stay balanced. In a dynamic

system the I/O load will change with time and there-

fore will require constant tweaking to maintain peak

efficiency. A better solution is to use an array of

disks. The RAB defines an array of disks as “a col-

lection of disks from one or more commonly acces-

sible disk subsystems, combined with a body of

Array Management Software (AMS)”.

Introduction

The term RAID (Redundant Array of Independent

Disks) first appeared in papers written by Garth Gib-

son, Randy Katz, and Dave Patterson of the Univer-

sity of California at Berkeley. Since that time the

number of manufacturers of RAID systems has

expanded to over 100 companies with product lines

that range from high end commercial products to

lower cost controllers for the home market.

The RAID advisory board (RAB) was formed in 1992

to help minimize confusion within the industry by

standardizing terminology and maintaining stan-

dards for the classification and typing of controllers.

The board is comprised of over 40 members and

continues to promote the industry by encouraging

the development of hardware components that are

optimized for RAID applications. The goal of the

RAB is to become a compliance verification and

testing organization that will issue product approv-

als, act as a regulatory agency, and assure users

that the RAID level claimed by the manufacturer

meets RAB standards. The RAB also will perform

testing to certify that vendor hardware meets RAB

requirements for Array-Ready Disks, and verify Disk

Array Performance Benchmarks.

Array Management Software is usually defined as

firmware that executes in a dedicated control sys-

tem rather than the host computer and has two

major functions. Function one is to map the storage

space available and optimize system balance to

maximize disk I/O performance. Function two is to

present storage to the operating environment as vir-

tual disks by converting I/O requests to virtual disk I/

O requests. This gives the appearance of a single

large disk to the system and frees the administrator

from constantly having to tweak the data distribu-

tion. Disk arrays generally have improved I/O perfor-

mance, and simpler storage management

requirements than a string of parallel disks.

RAID Theory Overview

The next task facing the designer of RAID systems

is to assure that data stored in the array can never

be lost due to hardware failure. Major users of disk

array systems such as banks, airlines, and credit

agencies must be certain that they can never lose a

disk in such a manner that the data stored on that

disk is not recoverable. Even frequent and consci-

entious backing up of all disk storage does not

recover new data that has been written since the

last backup cycle was performed. A solution to this

data reliability problem is the use of a RAID Control-

ler. RAID Controllers are defined with 7 levels:

For disk I/O intensive systems there are two charac-

teristics that act as the primary system performance

bottlenecks:

1. Data Seek Time

2. I/O Transfer Rates

It would seem logical that all that is required to

reduce the time necessary for the computer to fetch

data from the disk is to use multiple disks in parallel

and distribute the data. While this solution sounds

easy and cheap, the realities of life aren’t so simple.

As any experienced system administrator can tell

you 80% of the total I/O load of a system is directed

at 20% of the I/O resources. This so-called 80/20

rule requires that the I/O system be tuned to distrib-

ute the load over the bank of parallel disks. This

Level 0 - Data Striping

Level 1 - Disk Mirroring

Level 2 - Hamming Code

Level 3 - Parallel Transfer Disks with Parity

8-25

12 3 4

中文翻译

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与STK12C68-P35I相关器件

型号	品牌	获取价格	描述	数据表
STK12C68-P35M	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P45	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P45I	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P45M	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P55	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P55I	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-P55M	ETC	获取价格	8K x 8 AutoStore⑩ nvSRAM QuantumTrap⑩ CMOS No
STK12C68-PF25	CYPRESS	获取价格	64 Kbit (8K x 8) AutoStore nvSRAM
STK12C68-PF25	SIMTEK	获取价格	8Kx8 AutoStore nvSRAM
STK12C68-PF25I	CYPRESS	获取价格	64 Kbit (8K x 8) AutoStore nvSRAM

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