GENERAL DESCRIPTION
   MX25U25635F is 256Mb bits serial Flash memory, which is configured as 33,554,432 x 8 internally. When it is in two or four I/O mode, the structure becomes 134,217,728 bits x 2 or 67,108,864 bits x 4. MX25U25635F feature a serial peripheral interface and software protocol allowing operation on a simple 3-wire bus while it is in single I/O mode. The three bus signals are a clock input (SCLK), a serial data input (SI), and a serial data output (SO). Serial access to the device is enabled by CS# input.

FEATURES
GENERAL
• Serial Peripheral Interface compatible -- Mode 0 and Mode 3
• Single Power Supply Operation
   - 1.65 to 2.0 volt for read, erase, and program operations
• 256Mb: 268,435,456 x 1 bit structure or 134,217,728 x 2 bits (two I/O mode) structure or 67,108,864 x 4 bits (four I/O mode) structure
• Protocol Support
   - Single I/O, Dual I/O and Quad I/O
• Latch-up protected to 100mA from -1V to Vcc +1V
• Low Vcc write inhibit is from 1.0V to 1.4V
• Fast read for SPI mode
   - Support clock frequency up to 108MHz for all protocols
   - Support clock frequency up to 133MHz for all protocols (for MX25U25635FZ4I-08G only)
   - Support Fast Read, 2READ, DREAD, 4READ, QREAD instructions.
   - Configurable dummy cycle number for fast read operation
• Quad Peripheral Interface (QPI) available
• Equal Sectors with 4K byte each, or Equal Blocks with 32K byte each or Equal Blocks with 64K byte each
   - Any Block can be erased individually
• Programming :
   - 256byte page buffer
   - Quad Input/Output page program(4PP) to enhance program performance
• Typical 100,000 erase/program cycles
• 20 years data retention