at28lv64b-20tc ATMEL Corporation, at28lv64b-20tc Datasheet - Page 7

• Manufacturer Part Number: at28lv64b-20tc
• Description: 64k 8k X 8 Low Voltage Cmos E2 Prom With Page Write And Software Data Protection
• Manufacturer: ATMEL Corporation

Software Data Protection Write Cycle Waveforms
Notes: 1. A0 - A12 must conform to the addressing sequence for
Write Algorithm
Page Mode Characteristics
Symbol
t
t
t
t
t
t
t
t
WC
AS
AH
DS
DH
WP
BLC
WPH
the first three bytes as shown above.
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 0AAA
LAST ADDRESS
ADDRESS 1555
ADDRESS 1555
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
(1)
(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
2. Data protect state will be re-activated at
3. 1 to 64-bytes of data are loaded.
2. A6 through A12 must specify the same page address during
3. OE must be high only when WE and CE are both low.
Address Format: A12 - A0 (Hex).
the end of the write cycle.
each high to low transition of WE (or CE)
after the software code has been entered.
Min
100
100
200
100
0
0
(1, 2, 3)
AT28LV64B
Max
100
10
Units
ms
ns
ns
ns
ns
ns
ns
s
2-141