This part is a kind of semiconductor called 45DB041B.

Function of this product has 4-megabit 2.5-volt Only or 2.7-volt Only DataFlash.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

Features • • • • • • • • • • • • Single 2.5V - 3.6V or 2.7V - 3.6V Supply Serial Peripheral Interface (SPI) Compatible 20 MHz Max Clock Frequency Page Program Operation – Single Cycle Reprogram (Erase and Program) – 2048 Pages (264 Bytes/Page) Main Memory Supports Page and Block Erase Operations Two 264-byte SRAM Data Buffers – Allows Receiving of Data while Reprogramming of Nonvolatile Memory Continuous Read Capability through Entire Array Low Power Dissipation – 4 mA Active Read Current Typical – 2 µA CMOS Standby Current Typical Hardware Data Protection Feature 100% Compatible to AT45DB041 and AT45DB041A 5.0V-tolerant Inputs: SI, SCK, CS, RESET, and WP Pins Commercial and Industrial Temperature Ranges 4-megabit 2.5-volt Only or 2.7-volt Only DataFlash [ ... ]

45DB041B PDF Datasheet Download