This post describes for the EEPROM.
The part number is 4256BWP, M24256-BW.
The function of this semiconductor is 256-Kbit serial I2C bus EEPROM.
The package is SOP 8 Pin Type
The manufacturer of this part is STMicroelectronics.
See the preview image and the Datasheet PDF file for more information.
Description
Serial EEPROMs are commonly used in a wide range of applications, including embedded systems, consumer electronics, automotive electronics, and industrial equipment. They provide non-volatile storage for settings, calibration data, user preferences, and other important information in electronic devices.
The 4256BWP is a 256-Kbit I2C-compatible EEPROM (Electrically Erasable PROgrammable
Memory) organized as 32 K × 8 bits. The M24256-BW can operate with a supply voltage from 2.5 V to 5.5 V, the M24256-BR and M24256-DR can operate with a supply voltage from 1.8 V to 5.5 V, and the M24256-BF and M24256-DF can operate with a supply voltage from 1.7 V to 5.5 V. All these devices operate with a clock frequency of 1 MHz (or less), over an ambient temperature range of –40 °C / +85 °C.
The M24256-D offers an additional page, named the Identification Page (64 bytes). The Identification Page can be used to store sensitive application parameters which can be (later) permanently locked in Read-only mode.
42568WP Marking
Features:
• Compatible with all I2C bus modes: – 1 MHz – 400 kHz – 100 kHz
• Memory array: – 256 Kbit (32 Kbytes) of EEPROM – Page size: 64 bytes – Additional Write lockable page (M24256-D order codes)
• Single supply voltage and high speed: – 1 MHz clock from 1.7 V to 5.5 V
• Write: – Byte Write within 5 ms – Page Write within 5 ms
• Operating temperature range: – from -40 °C up to +85 °C
• Random and sequential Read modes • Write protect of the whole memory array
• Enhanced ESD/Latch-Up protection
• More than 4 million Write cycles
• More than 200-years data retention Packages
