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X28C512P-90 Datasheet(PDF) 7 Page - Xicor Inc.

Part # X28C512P-90
Description  5 Volt, Byte Alterable E2PROM
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28C512P-90 Datasheet(HTML) 7 Page - Xicor Inc.

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X28C512/X28C513
7
Software Data Protection
Figure 4a. Timing Sequence—Software Data Protect Enable Sequence followed by Byte or Page Write
Figure 4b. Write Sequence for Software Data
Protection
Regardless of whether the device has previously been
protected or not, once the software data protected
algorithm is used and data has been written, the
X28C512/513 will automatically disable further writes
unless another command is issued to cancel it. If no
further commands are issued the X28C512/513 will be
write protected during power-down and after any subse-
quent power-up. The state of A15 while executing the
algorithm is don’t care.
Note: Once initiated, the sequence of write operations
should not be interrupted.
NOTE: All other timings and control pins are per page write timing requirements.
3856 FHD F11
CE
WE
(VCC)
WRITE
PROTECTED
VCC
0V
DATA
ADDR
AA
5555
55
2AAA
A0
5555
≤t
BLC MAX
WRITES
OK
BYTE
OR
PAGE
tWC
WRITE LAST
BYTE TO
LAST ADDRESS
3856 FHD F12
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA A0
TO ADDRESS
5555
WRITE DATA XX
TO ANY
ADDRESS
AFTER tWC
RE-ENTERS DATA
PROTECTED STATE
WRITE DATA AA
TO ADDRESS
5555
OPTIONAL
BYTE/PAGE
LOAD OPERATION


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