CAT28LV65PA-25T datasheet(9/10 Pages) CATALYST

номер детали	CAT28LV65PA-25T

подробное описание детали	64K-Bit CMOS PARALLEL E2PROM

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производитель	CATALYST [Catalyst Semiconductor]

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CAT28LV65

9

Preliminary

Doc. No. 25041-00 2/98

HARDWARE DATA PROTECTION

The following is a list of hardware data protection fea-

tures that are incorporated into the CAT28LV65.

(1) VCC sense provides for 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 2.40V 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 Catalyst with the

software protection NOT ENABLED (the CAT28LV65 is

in the standard operating mode).

Figure 9. Write Sequence for Activating Software

Data Protection

Figure 10. Write Sequence for Deactivating

Software Data Protection

5094 FHD F08

5094 FHD F09

SOFTWARE DATA

PROTECTION ACTIVATED

(12)

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

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.

(1)

Аналогичный номер детали - CAT28LV65PA-25T

производитель	номер детали	датащи	подробное описание детали
Catalyst Semiconductor	CAT28LV65PA-25T	74Kb / 12P	64K-Bit CMOS PARALLEL EEPROM

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Аналогичное описание - CAT28LV65PA-25T

производитель	номер детали	датащи	подробное описание детали
Catalyst Semiconductor	CAT28C64BJ-12	57Kb / 12P	64K-Bit CMOS PARALLEL E2PROM
	CAT28HT64	219Kb / 10P	64K-Bit CMOS PARALLEL E2PROM
	CAT28LV64	78Kb / 10P	64K-Bit CMOS PARALLEL E2PROM
	CAT28C65B	60Kb / 11P	64K-Bit CMOS PARALLEL E2PROM
	CAT28C64A	238Kb / 8P	64K - BIT CMOS E2PROM
	CAT28HT256	218Kb / 10P	256K-Bit CMOS PARALLEL E2PROM
	CAT28LV256	53Kb / 10P	256K-Bit CMOS PARALLEL E2PROM
	CAT28C512	97Kb / 10P	512K-Bit CMOS PARALLEL E2PROM
	CAT28C17A	59Kb / 8P	16K-Bit CMOS PARALLEL E2PROM
	CAT28C257	75Kb / 10P	256K-Bit CMOS PARALLEL E2PROM

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Аналогичный номер детали - CAT28LV65PA-25T

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