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25AA640/25LC640
3.7
Data Protection
3.8
Power-On-State
The following protection has been implemented to
prevent inadvertent writes to the array:
? The write enable latch is reset on power-up
? A write enable instruction must be issued to set
the write enable latch
? After a byte write, page write, or STATUS register
write, the write enable latch is reset
? CS must be set high after the proper number of
clock cycles to start an internal write cycle
? Access to the array during an internal write cycle
is ignored and programming is continued
The 25XX640 powers on in the following state:
? The device is in low-power Standby mode
(CS = 1 )
? The write enable latch is reset
? SO is in high-impedance state
? A high-to-low transition on CS is required to enter
the active state
.
TABLE 3-3:
WRITE-PROTECT FUNCTIONALITY MATRIX
WPEN
X
0
1
X
WP
X
X
Low
High
WEL
0
1
1
1
Protected Blocks
Protected
Protected
Protected
Protected
Unprotected Blocks
Protected
Writable
Writable
Writable
STATUS Register
Protected
Writable
Protected
Writable
DS21223H-page 12
? 2008 Microchip Technology Inc.
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相关代理商/技术参数
25LC640-E/PG
功能描述:电可擦除可编程只读存储器 8kx8 - 2.5V Lead Free Package
RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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制造商:Microchip Technology Inc 功能描述:
25LC640-E/SN
功能描述:电可擦除可编程只读存储器 8kx8 - 2.5V RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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功能描述:电可擦除可编程只读存储器 8kx8 - 2.5V Lead Free Package RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
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制造商:Microchip Technology Inc 功能描述:EEPROM SERIAL 64K 25LC640 DIP8