M24256-BWMW6G STMicroelectronics, M24256-BWMW6G Datasheet - Page 13

• Manufacturer Part Number: M24256-BWMW6G
• Description: IC EEPROM 256KBIT 400KHZ 8SOIC
• Manufacturer: STMicroelectronics

Specifications of M24256-BWMW6G

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K 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 (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8580-5; M24256-BWMW6G

M24256-BF, M24256-BR, M24256-BW, M24256-DR
3.5
Addressing the memory array
To start communication between the bus master and the slave device, the bus master must
initiate a Start condition. Following this, the bus master sends the device select code, shown
in
The 4-bit device type identifier 1010b selects the memory array, the 4-bit device type
identifier 1011b selects the Identification page. A device select code handling a value
different than 1010b or 1011b is not acknowledged by the device.
Table 4.
1. The most significant bit, b7, is sent first.
2. E0, E1 and E2 are compared against the respective external pins on the memory device.
Up to eight memory devices can be connected on a single I
unique 3-bit code on the Chip Enable (E0, E1, E2) inputs. When the device select code is
received, the device only responds if the Chip Enable Address is the same as the value on
the Chip Enable (E0, E1, E2) inputs.
The 8
If a match occurs on the device select code, the corresponding device gives an
acknowledgment on Serial Data (SDA) during the 9
the device select code, it deselects itself from the bus, and goes into Standby mode.
Table 5.
1. X = V
Device select code
when addressing the
memory array
Device select code
when accessing the
Identification page
Current Address
Read
Random Address
Read
Sequential Read
Byte Write
Page Write
Table 4
th
Mode
IH
bit is the Read/Write bit (RW). This bit is set to 1 for Read and 0 for Write operations.
or V
(on Serial Data (SDA), most significant bit first).
Device select code (for memory array)
Operating modes
IL
.
RW bit
1
0
1
1
0
0
b7
1
1
Device type identifier
WC
Doc ID 6757 Rev 23
V
V
X
X
X
X
IL
IL
(1)
b6
0
0
Bytes
 64
 1
1
1
1
b5
1
1
(1)
th
Start, device select, RW = 1
Start, device select, RW = 0, Address
re-Start, device select, RW = 1
Similar to Current or Random Address
Read
Start, device select, RW = 0
Start, device select, RW = 0
b4
0
1
bit time. If the device does not match
Chip Enable address
2
b3
E2
E2
C bus. Each one is given a
Initial sequence
E1
E1
b2
Device operation
b1
E0
E0
(2)
RW
RW
RW
b0
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