This part is a kind of semiconductor called Pm25LD020.

Function of this product has 512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory.

Manufacturers : Chingis Technology

Image and pinout :

Some of the text within the PDF file :

512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus Interface Pm25LD512/010/ 020 FEATURES • Single Power Supply Operation - Low voltage range: 2.3 V – 3.6 V • Memory Organization - Pm25LD512: 64K x 8 (512 Kbit) - Pm25LD010: 128K x 8 (1 Mbit) - Pm25LD020: 256K x 8 (2 Mbit) • Cost Effective Sector/Block Architecture - 512Kb : Uniform 4KByte sectors / Two uniform 32KByte blocks - 1Mb : Uniform 4KByte sectors / Four uniform 32KByte blocks - 2Mb : Uniform 4KByte sectors / Four uniform 64KByte blocks • Low standby current 1uA (Typ) • Serial Peripheral Interface (SPI) Compatible - Supports single- or dual-output - Supports SPI Modes 0 and 3 - Maximum 33 MHz clock rate for normal read - Maximum 100 MHz clock rate for fast read • Pag [ ... ]

Pm25LD020 PDF Datasheet Download