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M24512-W Datasheet(PDF) 16 Page - STMicroelectronics

Part No. M24512-W
Description  512 Kbit and 256 Kbit serial I²C bus EEPROM with three Chip Enable lines
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M24512-W Datasheet(HTML) 16 Page - STMicroelectronics

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Device operation
M24512-x, M24256-Bx
16/35
3.9
ECC (error correction code) and write cycling
The M24xxx-W, M24xxx-R and M24xxx-HR devices offer an ECC (error correction code)
logic which compares each 4-byte word with its six associated ECC EEPROM bits. As a
result, if a single bit out of 4 bytes of data happens to be erroneous during a Read operation,
the ECC detects it and replaces it by the correct value. The read reliability is therefore much
improved by the use of this feature.
Note however that even if a single byte has to be written, 4 bytes are internally modified
(plus the ECC bits), that is, the addressed byte is cycled together with the other three bytes
making up the word. It is therefore recommended to write by word (4 bytes) in order to
benefit from the larger amount of Write cycles.
The M24xxx-W, M24xxx-R and M24xxx-HR devices are qualified at 1 million (1 000 000)
Write cycles, using a cycling routine that writes to the device by multiples of 4-bytes.
Figure 8.
Write Mode sequences with WC = 0 (data write enabled)
Byte Write
Dev sel
Byte addr
Byte addr
Data in
WC
Page Write
Dev sel
Byte addr
Byte addr
Data in 1
WC
Data in 2
AI01106d
Page Write
(cont'd)
WC (cont'd)
Data in N
ACK
R/W
ACK
ACK
ACK
ACK
ACK
ACK
ACK
R/W
ACK
ACK


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