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CAT28LV256T13I-30T Datasheet(PDF) 9 Page - Catalyst Semiconductor

No. de pieza CAT28LV256T13I-30T
Descripción Electrónicos  256K-Bit CMOS PARALLEL E2PROM
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT28LV256T13I-30T Datasheet(HTML) 9 Page - Catalyst Semiconductor

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CAT28LV256
9
Doc. No. 25040-00 4/01 P-1
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
SOFTWARE DATA
PROTECTION ACTIVATED
(1)
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
(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 CAT28LV256 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 CAT28LV256
is in the standard operating mode).
Figure 9. Write Sequence for Activating Software
Data Protection
Figure 10. Write Sequence for Deactivating
Software Data Protection
28LV256 F12
28LV256 F13
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 hardware data protection features are
incorporated into the CAT28LV256.
(1) VCC sense provides write protection when VCC falls
below 2.0V 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 2.4V min.
(3) Write inhibit is activated by holding any one of OE
low, CE high, or WE high.


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