Description
The AT25FS040 provides 4,194,304 bits of serial reprogrammable Flash memory organized as 524,288 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The AT25FS040 is available in a space-saving 8-lead JEDEC SOIC and 8-lead Ultra Thin SAP packages.

FEATUREs
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
   – Datasheet describes Mode 0 Operation
• 50 MHz Clock Rate
• Byte Mode and Page Mode Program (1 to 256 Bytes) Operations
• Sector/Block/Page Architecture
   – Sixteen 256 byte Pages per Sector
   – Sixteen 4 Kbyte Sectors per Block
   – Eight uniform 64 Kbyte Blocks
• Self-timed Sector, Block and Chip Erase
• Product Identification Mode with JEDEC Standard
• Low-voltage Operation
   – 2.7V (VCC = 2.7V to 3.6V)
• Hardware and Software Write Protection
   – Device protection with Write Protect (WP) Pin
   – Write Enable and Write Disable Instructions
   – Software Write Protection:
• Upper 1/64, 1/32, 1/16, 1/8, 1/4, 1/2 or Entire Array
• Flexible Op Codes for Maximum Compatibility
• Self-timed Program Cycle
   – 30 µs/Byte Typical
• Single Cycle Reprogramming (Erase and Program) for Status Register
• High Reliability
   – Endurance: 10,000 Write Cycles Typical
• 8-lead JEDEC 150mil SOIC and 8-lead Ultra Thin Small Array Package (SAP)
• Die Sales: Waffer Form, Tape and Reel, and Bumped Wafers