M24256-BWDW6TP STMicroelectronics, M24256-BWDW6TP Datasheet - Page 20

IC EEPROM 256KBIT 400KHZ 8TSSOP

M24256-BWDW6TP

Manufacturer Part Number
M24256-BWDW6TP
Description
IC EEPROM 256KBIT 400KHZ 8TSSOP
Manufacturer
STMicroelectronics
Datasheet

Specifications of M24256-BWDW6TP

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-TSSOP
Density
256Kb
Interface Type
Serial (I2C)
Organization
32Kx8
Access Time (max)
900ns
Frequency (max)
400KHz
Write Protection
Yes
Data Retention
40Year
Operating Supply Voltage (typ)
3.3/5V
Package Type
TSSOP
Operating Temp Range
-40C to 85C
Supply Current
2mA
Operating Supply Voltage (min)
2.5V
Operating Supply Voltage (max)
5.5V
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-8622-2
M24256-BWDW6TP

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0
Device operation
3.15
3.16
3.17
20/42
Current Address Read (in memory array)
For the Current Address Read operation, following a Start condition, the bus master only
sends a device select code with the Read/Write bit (RW) set to 1. The device acknowledges
this, and outputs the byte addressed by the internal address counter. The counter is then
incremented. The bus master terminates the transfer with a Stop condition, as shown in
Figure
Sequential Read
This operation can be used after a Current Address Read or a Random Address Read. The
bus master does acknowledge the data byte output, and sends additional clock pulses so
that the device continues to output the next byte in sequence. To terminate the stream of
bytes, the bus master must not acknowledge the last byte, and must generate a Stop
condition, as shown in
The output data comes from consecutive addresses, with the internal address counter
automatically incremented after each byte output. After the last memory address, the
address counter ‘rolls-over’, and the device continues to output data from memory address
00h.
Reading the Identification Page (M24256-D only)
The Identification Page (64 bytes) is an additional page which can be written and (later)
permanently locked in Read-only mode.
The Identification Page can be read by issuing a Read Identification Page instruction. This
instruction uses the same protocol and format as the Random Address Read (from memory
array) with device type identifier defined as 1011b. The MSB address bits A17/A6 are don't
care, the LSB address bits A5/A0 define the byte address inside the Identification Page. The
number of bytes to read in the ID page must not exceed the page boundary, otherwise
unexpected data will be read (e.g.: when reading the Identification Page from location 10d,
the number of bytes should be less than or equal to 54, as the ID page boundary is
64 bytes).
11, without acknowledging the byte.
Figure
11.
Doc ID 6757 Rev 23
M24256-BF, M24256-BR, M24256-BW, M24256-DR

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