M24128-BWMN6P STMicroelectronics, M24128-BWMN6P Datasheet - Page 17

• Manufacturer Part Number: M24128-BWMN6P
• Description: IC EEPROM 128KBIT 400KHZ 8SOIC
• Manufacturer: STMicroelectronics

Specifications of M24128-BWMN6P

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 128K (16K x 8)
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Organization: 16 K x 8
• Interface Type: I2C
• Maximum Clock Frequency: 0.4 MHz
• Access Time: 900 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.5 V
• Maximum Operating Current: 2 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V, 5.5 V
• Memory Configuration: 16384 X 8
• Clock Frequency: 400kHz
• Supply Voltage Range: 2.5V To 5.5V
• Memory Case Style: SO
• No. Of Pins: 8
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8577-5; M24128-BWMN6P

M24128-BW, M24128-BR, M24128-BF
4.9
Figure 9.
ECC (error correction code) and write cycling
The new M24128 devices offer an ECC (error correction code) logic which compares each
4-byte word with its six associated EEPROM ECC 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 word), that is, the addressed byte is cycled together with the three other bytes
making up the word. It is therefore recommended to write by packets of 4 bytes in order to
benefit from the larger amount of write cycles.
All M24128 devices are qualified at 1 million (1 000 000) write cycles; the new M24128
devices offering the ECC improvement are qualified using a cycling routine that writes to the
device by multiples of 4-byte words.
WC
Byte Write
WC
Page Write
WC (cont'd)
Page Write
(cont'd)
Write mode sequences with WC = 0 (data write enabled)
Dev Select
Dev Select
ACK
Doc ID 16892 Rev 19
Data in N
R/W
R/W
ACK
ACK
Byte address
Byte address
ACK
ACK
ACK
Byte address
Byte address
ACK
ACK
Data in 1
Data in
Device operation
ACK
ACK
AI01106d
Data in 2
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