10

0565E–FLASH–9/08

AT29LV020

17. Software Protected Program Waveform

Notes:

1. A8 through A17 must specify the sector address during each high to low transition of WE (or CE) after the software code has

been entered.

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

3. All bytes that are not loaded within the sector being programmed will be indeterminate.

18. Programming Algorithm

(1)

16. Program Cycle Characteristics

Symbol

Parameter

Min

Max

Units

Write Cycle Time

20

ms

t

AS

Address Set-up Time

10

ns

t

AH

Address Hold Time

100

ns

Data Set-up Time

100

ns

t

DH

Data Hold Time

10

ns

t

WP

Write Pulse Width

200

ns

Byte Load Cycle Time

150

µs

t

WPH

Write Pulse Width High

200

ns

Byte 0

Byte 254

Byte 255

Notes:

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

Address Format: A14 - A0 (Hex).

2. Data Protect state will be re-activated at end of

program cycle.

3. 256 bytes of data MUST BE loaded.

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA A0

TO

ADDRESS 5555

LOAD DATA

TO

WRITES ENABLED

ENTER DATA