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CAT28C512 데이터시트(PDF) 9 Page - ON Semiconductor

부품명 CAT28C512
상세설명  512K-Bit CMOS PARALLEL EEPROM
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CAT28C512/513
9
Doc. No. MD-1007, Rev . I
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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 fea-
tures that are incorporated into the CAT28C512/513.
(1) VCC sense provides for write protection when VCC
falls below 3.5V min.
(2) A power on delay mechanism, tINIT (see AC charac-
teristics), 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 CAT28C512/513 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
CAT28C512/513 is in the standard operating mode).
Figure 9. Write Sequence for Activating Software
Data Protection
Figure 10. Write Sequence for Deactivating
Software Data Protection
(1)
SOFTWARE DATA
PROTECTION ACTIVATED
(12)
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
WRITE DATA:
20
ADDRESS:
5555


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