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25LC640-I/SN 参数 Datasheet PDF下载

25LC640-I/SN图片预览
型号: 25LC640-I/SN
PDF下载: 下载PDF文件 查看货源
内容描述: 64K SPI总线串行EEPROM [64K SPI Bus Serial EEPROM]
分类和应用: 存储内存集成电路光电二极管PC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时钟
文件页数/大小: 24 页 / 361 K
品牌: MICROCHIP [ MICROCHIP TECHNOLOGY ]
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25AA640/25LC640
3.4
Write Enable (WREN) and
Write Disable (WRDI)
The following is a list of conditions under which the
write enable latch will be reset:
Power-up
WRDI
instruction successfully executed
WRSR
instruction successfully executed
WRITE
instruction successfully executed
The 25XX640 contains a write enable latch. See
This latch must be set before any write operation will be
completed internally. The
WREN
instruction will set the
latch, and the
WRDI
will reset the latch.
FIGURE 3-4:
WRITE ENABLE SEQUENCE
CS
0
SCK
1
2
3
4
5
6
7
SI
0
0
0
0
0
1
1
0
High-Impedance
SO
FIGURE 3-5:
WRITE DISABLE SEQUENCE
CS
0
SCK
1
2
3
4
5
6
7
SI
0
0
0
0
0
1
0
1
0
High-Impedance
SO
©
2008 Microchip Technology Inc.
DS21223H-page 9