at28lv256 ATMEL Corporation, at28lv256 Datasheet - Page 7

• Manufacturer Part Number: at28lv256
• Description: 256k 32k X 8 Low Voltage Cmos E2 Prom
• Manufacturer: ATMEL Corporation

Software Protected Write Cycle Waveforms
Notes: 1. A0 - A14 must conform to the addressing sequence for
Page Mode Characteristics
Programming Algorithm
Symbol
t
t
t
t
t
t
t
t
WC
AS
AH
DS
DH
WP
BLC
WPH
the first three bytes as shown above.
LAST ADDRESS
LOAD LAST BYTE
ADDRESS 2AAA
ANY ADDRESS
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA XX
LOAD DATA 55
LOAD DATA A0
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
TO
TO
TO
TO
TO
(3)
(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
2. A6 through A14 must specify the same page address during
3. OE must be high only when WE and CE are both low.
Notes:
1. Data Format: I/O7 - I/O0 (Hex);
2. Data protect state will be re-activated at the end of program
3. 1 to 64-bytes of data are loaded.
each high to low transition of WE (or CE) after the software
code has been entered.
cycle.
Address Format: A14 - A0 (Hex).
(1, 2, 3)
Min
200
100
50
50
0
0
AT28LV256
Max
150
10
Units
ms
ns
ns
ns
ns
ns
ns
s
2-151