X28C256DM datasheet(8/24 Pages) XICOR

8 / 24 page

X28C256

RESETTING SOFTWARE DATA PROTECTION

Figure 8. Reset Software Data Protection Timing Sequence

3855 FHD F18

Figure 9. Software Sequence to

Deactivate Software Data Protection

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

3855 FHD F19

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 X28C256 will be in standard operating mode.

Note:

Once initiated, the sequence of write operations

should not be interrupted.

STANDARD

OPERATING

MODE

VCC

DATA

ADDR.

5555

2AAA

5555

≥t

5555

2AAA

5555

X28C256DM Datasheet(PDF) 8 Page - Xicor Inc.

X28C256DM Datasheet(HTML) 8 Page - Xicor Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL