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參數(shù)資料
| 型號： | X28HC256 |
| 英文描述： | 5 Volt, Byte Alterable EEPROM(5V，字節(jié)可改變的EEPROM) |
| 中文描述： | 5伏，可變字節(jié)的EEPROM（5V的，字節(jié)可改變的EEPROM中） |
| 文件頁數(shù)： | 6/25頁 |
| 文件大?。?/td> | 212K |
| 代理商： | X28HC256 |
X28HC256
6
circuits by employing the software data protection fea-
ture. The internal software data protection circuit is
enabled after the first write operation utilizing the soft-
ware algorithm. This circuit is nonvolatile and will remain
set for the life of the device unless the reset command
is issued.
Once the software protection is enabled, the X28HC256
is also protected from inadvertent and accidental writes
in the powered-up state. That is, the software algorithm
must be issued prior to writing additional data to the
device.
SOFTWARE ALGORITHM
Selecting the software data protection mode requires
the host system to precede data write operations by a
series of three write operations to three specific ad-
dresses. Refer to Figure 6 and 7 for the sequence. The
three-byte sequence opens the page write window
enabling the host to write from one to one hundred
twenty-eight bytes of data. Once the page load cycle has
been completed, the device will automatically be re-
turned to the data protected state.
HARDWARE DATA PROTECTION
The X28HC256 provides two hardware features that
protect nonvolatile data from inadvertent writes.
Default V
CC
Sense—All write functions are inhibited
when V
CC
is
≤
3.5V Typically.
Write Inhibit—Holding either
OE
LOW,
WE
HIGH, or
CE
HIGH will prevent an inadvertent write cycle during
power-up and power-down, maintaining data integrity.
SOFTWARE DATA PROTECTION
The X28HC256 offers a software controlled data protec-
tion feature. The X28HC256 is shipped from Xicor with
the software data protection NOT ENABLED; that is, the
device will be in the standard operating mode. In this
mode data should be protected during power-up/down
operations through the use of external circuits. The host
would then have open read and write access of the
device once V
CC
was stable.
The X28HC256 can be automatically protected during
power-up and power-down without the need for external
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X28HC256_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5V, Byte Alterable EEPROM |
| X28HC256D-12 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5V, Byte Alterable EEPROM |
| X28HC256D-15 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM |
| X28HC256D1-90 | 制造商:Intersil Corporation 功能描述: |
| X28HC256D-70 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM |
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