Software Data Protection Write Cycle Waveforms

(1, 2, 3)

Notes: 1. A0 - A12 must conform to the addressing sequence for

the first three bytes as shown above.

2. A6 through A12 must specify the same page address during

each high to low transition of WE (or CE)

after the software code has been entered.

3. OE must be high only when WE and CE are both low.

LOAD LAST BYTE

TO

LAST ADDRESS

LOAD DATA A0

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA AA

TO

ADDRESS 1555

Notes for software program code:

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

Address Format: A12 - A0 (Hex).

2. Data protect state will be re-activated at

the end of the write cycle.

3. 1 to 64-bytes of data are loaded.

ENTER DATA

PROTECT STATE

WRITES ENABLED

(2)

Write Algorithm

(1)

LOAD DATA XX

TO

ANY ADDRESS

(3)

Symbol

Parameter

Min

Max

Units

Write Cycle Time

10

ms

Address Set-up Time

0

ns

Address Hold Time

100

ns

Data Set-up Time

100

ns

Data Hold Time

0

ns

Write Pulse Width

200

ns

Byte Load Cycle Time

100

µs

Write Pulse Width High

100

ns

Page Mode Characteristics

AT28LV64B

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