AT28C64B-20 Ver la hoja de datos (PDF) - Atmel Corporation

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AT28C64B-20

64K(8K x 8) Parallel EEPROM Page Write and Software Data Protection

Atmel Corporation 

Chip Erase Waveforms

AT28C64B

tS

tH

tW

tS = tH = 1 µs (min.)

tW = 10 ms (min.)

VH = 12.0 V ±0.5 V

Software Data Protection Algorithms

Software Data Protection Enable Algorithm(1)

LOAD DATA AA

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA A0

TO

ADDRESS 1555

WRITES ENABLED(2)

LOAD DATA XX

TO

ANY ADDRESS(4)

LOAD LAST BYTE

TO

LAST ADDRESS

ENTER DATA

PROTECT STATE

Note:

1. Notes for software program code:

2. Data Format: I/O7 - I/O0 (Hex);

Address Format: A12 - A0 (Hex).

3. Write Protect state will be activated at end of write even if no other data is loaded.

4. Write Protect state will be deactivated at end of write period even if no other data is

loaded.

5. 1 to 64 bytes of data are loaded.

9

0270I–PEEPR–08/03

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