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CAT28LV65WA-20T Datasheet(PDF) 9 Page - ON Semiconductor

Part # CAT28LV65WA-20T
Description  64 kb CMOS Parallel EEPROM
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT28LV65WA-20T Datasheet(HTML) 9 Page - ON Semiconductor

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CAT28LV65
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Hardware Data Protection
The following is a list of hardware data protection features
that are incorporated into the CAT28LV65.
1. VCC sense provides for write protection when VCC
falls below 2.0 V min.
2. A power on delay mechanism, tINIT (see AC
characteristics), provides a 5 to 10 ms delay before
a write sequence, after VCC has reached 2.40 V
min.
3. Write inhibit is activated by holding any one of
OE low, CE high or WE high.
4. Noise pulses of less than 20 ns on the WE or CE
inputs will not result in a write cycle.
Software Data Protection
The CAT28LV65 features a software controlled data
protection scheme which, once enabled, requires a data
algorithm to be issued to the device before a write can be
performed. The device is shipped from ON Semiconductor
with the software protection NOT ENABLED (the
CAT28LV65 is in the standard operating mode).
Figure 10. Write Sequence for Activating Software
Data Protection
Figure 11. Write Sequence for Deactivating
Software Data Protection
WRITE DATA:
XX
WRITE LAST BYTE
TO
LAST ADDRESS
TO ANY ADDRESS
WRITE DATA:
AA
ADDRESS:
1555
WRITE DATA:
55
ADDRESS:
0AAA
WRITE DATA:
A0
ADDRESS:
1555
WRITE DATA:
AA
ADDRESS:
1555
WRITE DATA:
55
ADDRESS:
0AAA
WRITE DATA:
80
ADDRESS:
1555
WRITE DATA:
AA
ADDRESS:
1555
WRITE DATA:
55
ADDRESS:
0AAA
WRITE DATA:
20
ADDRESS:
1555
SOFTWARE DATA
PROTECTION ACTIVATED (Note 14)
14.Write protection is activated at this point whether or not any more writes are completed. Writing to addresses must occur within tBLC Max.,
after SDP activation.


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