AT29C257-20JI Atmel, AT29C257-20JI Datasheet - Page 8
![IC FLASH 256KBIT 200NS 32PLCC](/photos/7/21/72190/453-32-plcc_sml.jpg)
AT29C257-20JI
Manufacturer Part Number
AT29C257-20JI
Description
IC FLASH 256KBIT 200NS 32PLCC
Manufacturer
Atmel
Datasheet
1.AT29C257-12JI.pdf
(12 pages)
Specifications of AT29C257-20JI
Format - Memory
FLASH
Memory Type
FLASH
Memory Size
256K (32K x 8)
Speed
200ns
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
32-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
AT29C25720JI
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT29C257-20JI
Manufacturer:
ATM
Quantity:
2 400
Company:
Part Number:
AT29C257-20JI
Manufacturer:
ATM
Quantity:
2 400
Software Protected Program Cycle Waveform
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
2. Data Protect state will be activated at end of program cycle.
3. Data Protect state will be deactivated at end of program
4. 64-bytes of data must be loaded.
Notes: 1. A6 through A14 must specify the page address
Software Data
Protection Enable Algorithm
4-112
Address Format: A14 - A0 (Hex).
period.
2. OE must be high when WE and CE are both low.
during each high to low transition of WE (or CE)
after the software code has been entered.
PAGE (64 BYTES)
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA 55
LOAD DATA A0
LOAD DATA
TO
TO
TO
TO
AT29C257
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(1)
(2)
3. All bytes that are not loaded within the page being
Software Data
Protection Disable Algorithm
programmed will be indeterminate.
(1, 2, 3)
PAGE (64 BYTES)
ADDRESS 2AAA
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
LOAD DATA
TO
TO
TO
TO
TO
TO
TO
(4)
EXIT DATA
PROTECT STATE
(1)
(3)