AT29LV256-15JI Atmel, AT29LV256-15JI Datasheet - Page 3

• Manufacturer Part Number: AT29LV256-15JI
• Description: IC FLASH 256KBIT 150NS 32PLCC
• Manufacturer: Atmel

Specifications of AT29LV256-15JI

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 256K (32K x 8)
• Speed: 150ns
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3. Block Diagram
4. Device Operation
4.1
4.2
0563E–FLASH–2/07
Read
Software Data Protection Programming
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.
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 programmed. 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 inadvertent 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 pro-
gram operation. All software program commands must obey the sector program timing
specifications. Power transitions will not reset the software data protection feature; however,
the software feature will guard against inadvertent program cycles during power transitions.
Any attempt to write to the device without the 3-byte command sequence will start the internal
write timers. No data will be written to the device; however, for the duration of t
ation will effectively be a polling operation.
AT29LV256
WC
, a read oper-
3