AT29LV256-20PI ATMEL [ATMEL Corporation], AT29LV256-20PI Datasheet - Page 7

• Manufacturer Part Number: AT29LV256-20PI
• Description: 256K 32K x 8 3-volt Only CMOS Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

Program Cycle Characteristics
Software Protected Program Waveform
Notes: 1. OE must be high when WE and CE are both low.
Programming Algorithm
Symbol
t
t
t
t
t
t
t
t
WC
AS
AH
DS
DH
WP
BLC
WPH
2. A6 through A14 must specify the sector address
during each high to low transition of WE (or CE)
after the software code has been entered.
SECTOR (64 BYTES)
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA 55
LOAD DATA A0
LOAD DATA
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
(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(1)
(2)
Min
100
100
200
200
10
10
(1, 2, 3)
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
2. Data Protect state will be re-activated at end of program cycle.
3. 64-bytes of data
3. All bytes that are not loaded within the sector being
Address Format: A14 - A0 (Hex).
programmed will be indeterminate.
MUST BE
Max
150
20
AT29LV256
loaded.
Units
ms
ns
ns
ns
ns
ns
ns
s
4-39