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CAT28C65BLA15 Arkusz danych(PDF) 10 Page - ON Semiconductor

Numer części CAT28C65BLA15
Szczegółowy opis  64K-Bit CMOS PARALLEL EEPROM
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CAT28C65B
10
Doc. No. MD-1009, Rev. H
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
SOFTWARE DATA
PROTECTION ACTIVATED
(1)
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
Note:
(1)
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.
HARDWARE DATA PROTECTION
The following is a list of hardware data protection features
that are incorporated into the CAT28C65B.
(1) VCC sense provides for write protection when VCC
falls below 3.5V 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 3.5V 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 CAT28C65B 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 Catalyst with the
software protection NOT ENABLED (the CAT28C65B is
in the standard operating mode).
Figure 9. Write Sequence for Activating Software
Data Protection
Figure 10. Write Sequence for Deactivating
Software Data Protection
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


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