Datasheet > CAT35C804ACC

CAT35C804ACC

更新时间： 2024-02-05 14:36:44

品牌	Logo	应用领域
CATALYST		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内存集成电路
页数	文件大小	规格书
14页	88K
描述
EEPROM, 256X16, Serial, CMOS

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CAT35C804ACC 技术参数

生命周期：	Obsolete	包装说明：	, DIE OR CHIP
Reach Compliance Code：	unknown	风险等级：	5.84
备用内存宽度：	8	数据保留时间-最小值：	10
耐久性：	10000 Write/Erase Cycles	内存密度：	4096 bit
内存集成电路类型：	EEPROM	内存宽度：	16
字数：	256 words	字数代码：	256
最高工作温度：	70 °C	最低工作温度：
组织：	256X16	封装等效代码：	DIE OR CHIP
并行/串行：	SERIAL	电源：	5 V
认证状态：	Not Qualified	最大待机电流：	0.0001 A
子类别：	EEPROMs	最大压摆率：	0.003 mA
标称供电电压 (Vsup)：	5 V	技术：	CMOS
温度等级：	COMMERCIAL	写保护：	SOFTWARE
Base Number Matches：	1

CAT35C804ACC 数据手册

CAT35C804A

Preliminary

divided into a read-only area and a non-access area.

Figure2illlustratesthispartitioningofthememoryarray.

PASSWORD PROTECTION

The CAT35C804A is a 4K-bit E²PROM that features a

password protection scheme to prevent unauthorized

accesstotheinformationstoredinthedevice.Itcontains

an access code register which stores one to eight bytes

ofaccesscodealongwiththelengthofthataccesscode.

Additionally, a memory pointer register stores the ad-

dress that partitions the memory into protected and

unprotected areas. As shipped from the factory, the

deviceisunprogrammedandunprotected. Thelengthof

theaccesscodeisequaltozeroandthememorypointer

is fully accessible without an access code. Setting a

password and moving the memory pointer register to

coverallorpartofthememorysecuresthedevice. Once

secured, the memory is divided into a read/write area

and a read-only area with the entry of a valid access

code. If no access code is entered, the memory is

WRITE PROTECTION

Another feature of the CAT35C804A is WRITE-protec-

tion without the use of an access code. If the memory

pointer register is set to cover all or part of the memory,

without setting the access code register, the device may

be divided into an area which allows full access, and an

area which allows READ-only access. To write into the

READ-only area, the user can override the memory

pointer register for every WRITE instruction or he can

simply move the address in the memory pointer register

to uncover this area, and then write into the memory.

This mechanism prevents inadvertent overwriting of

important data in the memory without the use of an

access code. Figure 3 illustrates this partitioning of the

memory array.

Figure 1. A.C. Timing

VCCS

CLK

START BIT

STOP BIT

HIGH-Z

35C804 F03

MARK

(1)

DATA TIMING

SPACE

BIT TIME

104 µs

CHARACTER TIME @ 9600 BAUD

Note:

(1) If PE pin = 1.

Doc. No. 25043-00 2/98

1 2 345 6 7...14

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与CAT35C804ACC相关器件

型号	品牌	描述	获取价格	数据表
CAT35C804ACI	CATALYST	EEPROM, 256X16, Serial, CMOS	获取价格
CAT35C804ADI	ETC	Serial EEPROM	获取价格
CAT35C804AJATE13	CATALYST	4K-Bit Secure Access Serial E2PROM	获取价格
CAT35C804AJA-TE13	CATALYST	EEPROM, 512X8, Serial, CMOS, PDSO16, SOIC-16	获取价格
CAT35C804AJITE13	CATALYST	4K-Bit Secure Access Serial E2PROM	获取价格
CAT35C804AJI-TE13	ETC	Serial EEPROM	获取价格

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