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XM28C020PMHR-25 Datasheet(PDF) 8 Page - Xicor Inc.

Part # XM28C020PMHR-25
Description  5 Volt, Byte Alterable E2PROM
Download  16 Pages
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

XM28C020PMHR-25 Datasheet(HTML) 8 Page - Xicor Inc.

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XM28C020
8
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
3872 FHD F16
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
3872 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.
CE
WE
STANDARD
OPERATING
MODE
VCC
DATA
ADDRESS
A0–A15*
AA
5555
55
2AAA
80
5555
*A16 & A17 select one of four devices on the module.
≥t
WC
AA
5555
55
2AAA
20
5555
SYMBOL TABLE
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


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