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FM25040C датащи(PDF) 8 Page - Ramtron International Corporation

номер детали FM25040C
подробное описание детали  4Kb Serial 5V F-RAM Memory
PDF  13 Pages
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производитель  RAMTRON [Ramtron International Corporation]
домашняя страница  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25040C датащи(HTML) 8 Page - Ramtron International Corporation

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FM25040C - 4Kb 5V SPI F-RAM
Rev. 1.1
July 2011
Page 8 of
13
Figure 9. Memory Write
Figure 10. Memory Read
Endurance
Internally, a F-RAM operates with a read and restore
mechanism. Therefore, endurance cycles are applied
for each access: read or write. The
F-RAM
architecture is based on an array of rows and
columns. Each access causes a cycle for an entire
row. In the FM25040C, a row is 64 bits wide. Every
8-byte boundary marks the beginning of a new row.
Endurance can be optimized by ensuring frequently
accessed
data
is
located
in
different
rows.
Regardless, F-RAM read and write endurance is
effectively unlimited at the 20MHz clock speed.
Even at 2000 accesses per second to the same row, 15
years time will elapse before 10
12 endurance cycles
occur.
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