Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

AT29LV256 Datasheet(PDF) 2 Page - ATMEL Corporation

Part # AT29LV256
Description  256K 32K x 8 3-volt Only CMOS Flash Memory
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29LV256 Datasheet(HTML) 2 Page - ATMEL Corporation

  AT29LV256 Datasheet HTML 1Page - ATMEL Corporation AT29LV256 Datasheet HTML 2Page - ATMEL Corporation AT29LV256 Datasheet HTML 3Page - ATMEL Corporation AT29LV256 Datasheet HTML 4Page - ATMEL Corporation AT29LV256 Datasheet HTML 5Page - ATMEL Corporation AT29LV256 Datasheet HTML 6Page - ATMEL Corporation AT29LV256 Datasheet HTML 7Page - ATMEL Corporation AT29LV256 Datasheet HTML 8Page - ATMEL Corporation AT29LV256 Datasheet HTML 9Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 2 / 10 page
background image
Block Diagram
To allow for simple in-system reprogrammability, the
AT29LV256 does not require high input voltages for pro-
gramming. Three-volt-only commands determine the op-
eration of the device. Reading data out of the device is
similar to reading from an EPROM. Reprogramming the
AT29LV256 is performed on a sector basis; 64-bytes of
data are loaded into the device and then simultaneously
programmed.
During a reprogram cycle, the address locations and 64-
bytes of data are captured at microprocessor speed and
internally latched, freeing the address and data bus for
other operations. Following the initiation of a program cy-
cle, the device will automatically erase the sector and then
program the latched data using an internal control timer.
The end of a program cycle can be detected by DATA poll-
ing of I/O7. Once the end of a program cycle has been
detected, a new access for a read or program can begin.
Description (Continued)
Device Operation
READ:
The AT29LV256 is accessed like an EPROM.
When CE and OE are low and WE is high, the data stored
at the memory location determined by the address pins is
asserted on the outputs. The outputs are put in the high
impedance state whenever CE or OE is high. This dual-
line control gives designers flexibility in preventing bus
contention.
SOFTWARE DATA PROTECTION PROGRAMMING:
The AT29LV256 has 512 individual sectors, each 64-
bytes. Using the software data protection feature, byte
loads are used to enter the 64-bytes of a sector to be pro-
grammed. The AT29LV256 can only be programmed or
reprogrammed using the software data protection feature.
The device is programmed on a sector basis. If a byte of
data within the sector is to be changed, data for the entire
64-byte sector must be loaded into the device. The
AT29LV256 automatically does a sector erase prior to
loading the data into the sector. An erase command is not
required.
Software data protection protects the device from inadver-
tent programming. A series of three program commands
to specific addresses with specific data must be presented
to the device before programming may occur. The same
three program commands must begin each program op-
eration. All software program commands must obey the
sector program timing specifications. Power transitions
will not reset the software data protection feature, however
(continued)
the software feature will guard against inadvertent pro-
gram cycles during power transitions.
Any attempt to write to the device without the 3-byte com-
mand sequence will start the internal write timers. No data
will be written to the device; however, for the duration of
tWC, a read operation will effectively be a polling operation.
After the software data protection’s 3-byte command code
is given, a byte load is performed by applying a low pulse
on the WE or CE input with CE or WE low (respectively)
and OE high. The address is latched on the falling edge of
CE or WE, whichever occurs last. The data is latched by
the first rising edge of CE or WE.
The 64-bytes of data must be loaded into each sector. Any
byte that is not loaded during the programming of its sec-
tor will be erased to read FFh. Once the bytes of a sector
are loaded into the device, they are simultaneously pro-
grammed during the internal programming period. After
the first data byte has been loaded into the device, suc-
cessive bytes are entered in the same manner. Each new
byte to be programmed must have its high to low transition
on WE (or CE) within 150
µs of the low to high transition of
WE (or CE) of the preceding byte. If a high to low transition
is not detected within 150
µs of the last low to high transi-
tion, the load period will end and the internal programming
period will start. A6 to A14 specify the sector address. The
sector address must be valid during each high to low tran-
4-34
AT29LV256


Similar Part No. - AT29LV256

ManufacturerPart #DatasheetDescription
logo
ATMEL Corporation
AT29LV010A ATMEL-AT29LV010A Datasheet
491Kb / 10P
   1 Megabit 128K x 8 3-volt Only CMOS Flash
AT29LV010A-12JC ATMEL-AT29LV010A-12JC Datasheet
721Kb / 16P
   1-megabit (128K x 8) 3-volt Only Flash Memory
AT29LV010A-12JI ATMEL-AT29LV010A-12JI Datasheet
721Kb / 16P
   1-megabit (128K x 8) 3-volt Only Flash Memory
AT29LV010A-12TC ATMEL-AT29LV010A-12TC Datasheet
721Kb / 16P
   1-megabit (128K x 8) 3-volt Only Flash Memory
AT29LV010A-12TI ATMEL-AT29LV010A-12TI Datasheet
721Kb / 16P
   1-megabit (128K x 8) 3-volt Only Flash Memory
More results

Similar Description - AT29LV256

ManufacturerPart #DatasheetDescription
logo
ATMEL Corporation
AT29C257 ATMEL-AT29C257 Datasheet
562Kb / 12P
   256K 32K x 8 5-volt Only CMOS Flash Memory
AT29C256 ATMEL-AT29C256 Datasheet
664Kb / 12P
   256K 32K x 8 5-volt Only CMOS Flash Memory
AT29C256 ATMEL-AT29C256 Datasheet
343Kb / 17P
   256K (32K x 8) 5-volt Only Flash Memory
AT29LV020 ATMEL-AT29LV020 Datasheet
486Kb / 10P
   2 Megabit 256K x 8 3-volt Only CMOS Flash Memory
AT29LV020 ATMEL-AT29LV020_08 Datasheet
387Kb / 16P
   2-megabit (256K x 8) 3-volt Only Flash Memory
AT29C020 ATMEL-AT29C020 Datasheet
257Kb / 11P
   2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
AT49F020 ATMEL-AT49F020 Datasheet
84Kb / 10P
   2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
logo
PMC-Sierra, Inc
PM29F002 PMC-PM29F002 Datasheet
148Kb / 21P
   2 Megabit (256K X 8) 5.0 Volt-only CMOS Flash Memory
logo
ATMEL Corporation
AT49F002T ATMEL-AT49F002T Datasheet
119Kb / 12P
   2-Megabit 256K x 8 5-volt Only CMOS Flash Memory
AT49BV4096 ATMEL-AT49BV4096 Datasheet
176Kb / 11P
   4-Megabit 256K x 16 3-volt Only CMOS Flash Memory
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com