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AS58LC1001DG-35/IT 参数 Datasheet PDF下载

AS58LC1001DG-35/IT图片预览
型号: AS58LC1001DG-35/IT
PDF下载: 下载PDF文件 查看货源
内容描述: 128K ×8 EEPROM耐辐射 [128K x 8 EEPROM Radiation Tolerant]
分类和应用: 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
文件页数/大小: 21 页 / 272 K
品牌: AUSTIN [ AUSTIN SEMICONDUCTOR ]
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EEPROM  
AS58LC1001  
Austin Semiconductor, Inc.  
(EXAMPLE)  
Vcc  
RES\  
*unprogrammable  
*unprogrammable  
FUNCTIONAL DESCRIPTION (continued)  
Write Data  
Write Address  
5555  
(Normal Data Input)  
DATAPROTECTION (continued)  
2. Data protection at Vcc on/off.  
AA  
55  
When RES\ is low, the EEPROM cannot be erased and  
programmed. Therefore, data can be protected by keeping  
RES\ low when Vcc is switched. RES\ should be high during  
programming because it does not provide a latch function.  
When Vcc is turned on or off, noise on the control pins  
generated by external circuits (CPU, etc.) may turn the  
EEPROM to programming mode by mistake. To prevent  
this unintentional programming, the EEPROM must be kept  
in an unprogrammable, standby or readout state by using a  
CPU reset signal to RES\ pin.  
2AAA  
5555  
A0  
The Software data protection mode can be cancelled by  
inputting the following 6 Bytes. This changes theAS58LC1001  
to the Non-Protection mode, for normal operation.  
In addition, when RES\ is kept high at Vcc on/off timing,  
the input level of control pins (CE\, OE\, WE\) must be held  
as CE\=Vcc or OE\=LOW or WE\=Vcc level.  
Address  
5555  
Data  
AA  
3. Software Data Protection  
To protect against unintentional programming caused by  
noise generated by external circuits,AS58LC1001 has a  
Software data protection function. To initate Software data  
protection mode, 3 bytes of data must be input, followed by  
a dummy write cycle of any address and any data byte. This  
2AAA  
5555  
55  
80  
exact sequence switches the device into protection mode.  
5555  
AA  
55  
2AAA  
5555  
20  
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.  
AS58LC1001  
Rev. 1.0 12/08  
4