10

0273K–PEEPR–2/09

AT28BV256

17. Programming Algorithm(1)(2)(3)

Notes:

1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex).

2. Data protect state will be re-activated at the end of program cycle.

3. 1 to 64 bytes of data are loaded.

18. Software Protected Program Cycle Waveforms(1)(2)(3)

Notes:

1. A0 - A14 must conform to the addressing sequence for the first three bytes as shown above.

2. A6 through A14 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.

16. Page Mode Characteristics

Symbol

Parameter

Min

Max

Units

t

WC

Write Cycle Time

10

ms

Address Set-up Time

0

ns

t

AH

Address Hold Time

50

ns

Data Set-up Time

50

ns

Data Hold Time

0

ns

t

WP

Write Pulse Width

200

ns

Byte Load Cycle Time

150

µs

Write Pulse Width High

100

ns

LOAD DATA AA

TO

ADDRESS 5555

LOAD DATA 55

TO

ADDRESS 2AAA

LOAD DATA A0

TO

ADDRESS 5555

LOAD DATA XX

TO

LOAD LAST BYTE

TO

ENTER DATA

PROTECT STATE