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CAT28C256PI-15T 数据表(PDF) 9 Page - ON Semiconductor

部件名 CAT28C256PI-15T
功能描述  256 kb Parallel EEPROM
Download  14 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

CAT28C256PI-15T 数据表(HTML) 9 Page - ON Semiconductor

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CAT28C256
http://onsemi.com
9
Hardware Data Protection
The following is a list of hardware data protection features
that are incorporated into the CAT28C256.
1. VCC sense provides for write protection when VCC
falls below 3.5 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 3.5 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 CAT28C256 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
CAT28C256 is in the standard operating mode).
WRITE DATA:
XX
WRITE LAST BYTE
TO
LAST ADDRESS
TO ANY ADDRESS
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
WRITE DATA:
A0
ADDRESS:
5555
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
WRITE DATA:
80
ADDRESS:
5555
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
20
ADDRESS:
5555
Figure 10. Write Sequence for Activating
Software Data Protection
Figure 11. Write Sequence for Deactivating
Software Data Protection
WRITE DATA:
SOFTWARE DATA
PROTECTION ACTIVATED (Note 15)
15.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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