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XM28C040M-25 Datasheet(PDF) 8 Page - Xicor Inc.

Part # XM28C040M-25
Description  5 Volt, Byte Alterable E2PROM
Download  17 Pages
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

XM28C040M-25 Datasheet(HTML) 8 Page - Xicor Inc.

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XM28C040
8
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
3873 FHD F16
3873 FHD F17
Figure 9. Software Sequence to Deactivate
Software Data Protection
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an E2PROM programmer, the following six step algo-
rithm will reset the internal protection circuit. After tWC,
the device will be in standard operating mode.
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 80
TO ADDRESS
5555
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 20
TO ADDRESS
5555
WRITE DATA AA
TO ADDRESS
5555
CE
WE
STANDARD
OPERATING
MODE
VCC
DATA
ADDR.
A0–A16*
AA
5555
55
2AAA
80
5555
*A17 & A18 select one of four devices on the module.
≥t
WC
AA
5555
55
2AAA
20
5555
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
SYMBOL TABLE


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