AT49LV002T-12PI Atmel, AT49LV002T-12PI Datasheet - Page 4
![IC FLASH 2MBIT 120NS 32DIP](/photos/7/21/72192/313-32-dip_sml.jpg)
AT49LV002T-12PI
Manufacturer Part Number
AT49LV002T-12PI
Description
IC FLASH 2MBIT 120NS 32DIP
Manufacturer
Atmel
Datasheet
1.AT49BV002-90JC.pdf
(26 pages)
Specifications of AT49LV002T-12PI
Format - Memory
FLASH
Memory Type
FLASH
Memory Size
2M (256K x 8)
Speed
120ns
Interface
Parallel
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
32-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
AT49LV002T12PI
BYTE PROGRAMMING: Once the memory array is erased, the device is programmed (to a
logical “0”) on a byte-by-byte basis. Please note that a data “0” cannot be programmed back to
a “1”; only erase operations can convert “0”s to “1”s. Programming is accomplished via the
internal device command register and is a 4 bus cycle operation (please refer to the Command
Definitions table). The device will automatically generate the required internal program pulses.
The program cycle has addresses latched on the falling edge of WE or CE, whichever occurs
last, and the data latched on the rising edge of WE or CE, whichever occurs first. Program-
ming is completed after the specified t
cycle time. The DATA polling feature may also be
BP
used to indicate the end of a program cycle.
BOOT BLOCK PROGRAMMING LOCKOUT: The device has one designated block that has
a programming lockout feature. This feature prevents programming of data in the designated
block once the feature has been enabled. The size of the block is 16K bytes. This block,
referred to as the boot block, can contain secure code that is used to bring up the system.
Enabling the lockout feature will allow the boot code to stay in the device while data in the rest
of the device is updated. This feature does not have to be activated; the boot block’s usage as
a write protected region is optional to the user. The address range of the boot block is 00000
to 03FFF for the AT49BV/LV002(N) while the address range of the boot block is 3C000 to
3FFFF for the AT49BV/LV002(N)T.
Once the feature is enabled, the data in the boot block can no longer be erased or pro-
grammed with input voltage of 5.5V or less. Data in the main memory block can still be
changed through the regular programming method. To activate the lockout feature, a series of
six program commands to specific addresses with specific data must be performed. Please
refer to the Command Definitions table.
BOOT BLOCK LOCKOUT DETECTION: A software method is available to determine if pro-
gramming of the boot block section is locked out. When the device is in the software product
identification mode (see Software Product Identification Entry and Exit sections) a read from
address location 00002H will show if programming the boot block is locked out for the
AT49BV/LV002(N), and a read from address location 3C002H will show if programming the
bootblock is locked out for AT49BV/LV002(N)T. If the data on I/O0 is low, the boot block can
be programmed; if the data on I/O0 is high, the program lockout feature has been activated
and the block cannot be programmed. The software product identification code should be
used to return to standard operation.
BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE: The user can override the boot
block programming lockout by taking the RESET pin to 12 volts during the entire chip erase,
sector erase or byte programming operation. When the RESET pin is brought back to TTL lev-
els the boot block programming lockout feature is again active. This feature is not available on
the AT49BV/LV002N(T).
PRODUCT IDENTIFICATION: The product identification mode identifies the device and man-
ufacturer as Atmel. It may be accessed by hardware or software operation. The hardware
operation mode can be used by an external programmer to identify the correct programming
algorithm for the Atmel product.
For details, see Operating Modes (for hardware operation) or Software Product Identification.
The manufacturer and device code is the same for both modes.
AT49BV/LV002(N)(T)
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