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FM25V20 데이터시트(PDF) 10 Page - Ramtron International Corporation

부품명 FM25V20
상세설명  2Mb Serial 3V F-RAM Memory
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제조업체  RAMTRON [Ramtron International Corporation]
홈페이지  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25V20 데이터시트(HTML) 10 Page - Ramtron International Corporation

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FM25V20 - 2Mb SPI F-RAM
Rev. 3.0
August 2012
Page 10 of 17
Endurance
The FM25V20 device is capable of being accessed at
least 10
14 times, reads or writes. An F-RAM memory
operates
with a read and restore
mechanism.
Therefore, an endurance cycle is applied on a row
basis for each access (read or write) to the memory
array. The F-RAM architecture is based on an array
of rows and columns. Rows are defined by A17-A3
and column addresses by A2-A0.
See Block
Diagram (pg 2) which shows the array as 32K rows
of 64-bits each. The entire row is internally accessed
once whether a single byte or all eight bytes are read
or written. Each byte in the row is counted only once
in an endurance calculation. The table below shows
endurance calculations for 64-byte repeating loop,
which includes an op-code, a starting address, and a
sequential 64-byte data stream. This causes each byte
to experience one endurance cycle through the loop.
F-RAM read and write endurance is virtually
unlimited even at 40MHz clock rate.
Table 6. Time to Reach 100 Trillion Cycles for Repeating 64-byte Loop
SCK Freq
(MHz)
Endurance
Cycles/sec.
Endurance
Cycles/year
Years to Reach
10
14 Cycles
40
73,520
2.32 x 10
12
43.1
10
18,380
5.79 x 10
11
172.7
5
9,190
2.90 x 10
11
345.4


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