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AT28LV64B_

64K (8K x 8) Low Voltage CMOS E2PROM with Page Write and Software Data Protection

Atmel Corporation 

AT28LV64B

Page Mode Characteristics

Symbol

tWC

tAS

tAH

tDS

tDH

tWP

tBLC

tWPH

Parameter

Write Cycle Time

Address Set-up Time

Address Hold Time

Data Set-up Time

Data Hold Time

Write Pulse Width

Byte Load Cycle Time

Write Pulse Width High

Write Algorithm (1)

LOAD DATA AA

TO

ADDRESS 1555

LOAD DATA 55

TO

ADDRESS 0AAA

LOAD DATA A0

TO

ADDRESS 1555

LOAD DATA XX

TO

ANY ADDRESS (3)

WRITES ENABLED (2)

Min

Max

10

0

100

100

0

200

100

100

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.

LOAD LAST BYTE

TO

LAST ADDRESS

ENTER DATA

PROTECT STATE

Software Data Protection Write Cycle Waveforms (1, 2, 3)

Units

ms

ns

ns

ns

ns

ns

µs

ns

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.

2-141

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