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X28HC256JM-90 Datasheet(PDF) 6 Page - Xicor Inc.

Part # X28HC256JM-90
Description  5 Volt, Byte Alterable E2PROM
Download  24 Pages
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28HC256JM-90 Datasheet(HTML) 6 Page - Xicor Inc.

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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 VCC Sense—All write functions are inhibited
when VCC 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 VCC was stable.
The X28HC256 can be automatically protected during
power-up and power-down without the need for external


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