at28lv010 ATMEL Corporation, at28lv010 Datasheet - Page 3

• Manufacturer Part Number: at28lv010
• Description: At28lv010 1-megabit 128k X 8 Low Voltage Paged Parallel Eeproms
• Manufacturer: ATMEL Corporation

3. Block Diagram
4. Device Operation
4.1
4.2
0395D–PEEPR–10/06
Read
Write
The AT28LV010 is accessed like a Static RAM. 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 when either CE or OE is high. This dual-line
control gives designers flexibility in preventing bus contention in their system.
The write operation of the AT28LV010 allows 1 to 128 bytes of data to be written into the
device during a single internal programming period. Each write operation must be preceded by
the software data protection (SDP) command sequence. This sequence is a series of three
unique write command operations that enable the internal write circuitry. The command
sequence and the data to be written must conform to the software protected write cycle timing.
Addresses are latched on the falling edge of WE or CE, whichever occurs last and data is
latched on the rising edge of WE or CE, whichever occurs first. Each successive byte must be
written within 150 µs (t
will cease accepting data and commence the internal programming operation. If more than
one data byte is to be written during a single programming operation, they must reside on the
same page as defined by the state of the A7 - A16 inputs. For each WE high to low transition
during the page write operation, A7 - A16 must be the same.
The A0 to A6 inputs are used to specify which bytes within the page are to be written. The
bytes may be loaded in any order and may be altered within the same load period. Only bytes
which are specified for writing will be written; unnecessary cycling of other bytes within the
page does not occur.
BLC
) of the previous byte. If the t
BLC
limit is exceeded the AT28LV010
AT28LV010
3