X28C256D Xicor, X28C256D Datasheet - Page 8

• Manufacturer Part Number: X28C256D
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28C256
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
Figure 9. Software Sequence to
Deactivate Software Data Protection
V CC
WE
CE
ADDR.
DATA
5555
AA
WRITE DATA AA
WRITE DATA 55
WRITE DATA AA
WRITE DATA 55
WRITE DATA 20
WRITE DATA 80
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
2AAA
2AAA
5555
5555
5555
5555
2AAA
55
5555
80
3855 FHD F19
5555
AA
8
2AAA
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an E
rithm will reset the internal protection circuit. After t
the X28C256 will be in standard operating mode.
Note:
55
2
PROM programmer, the following six step algo-
Once initiated, the sequence of write operations
should not be interrupted.
5555
20
t WC
STANDARD
OPERATING
MODE
3855 FHD F18
WC
,