GENERAL DESCRIPTION
The A25L040A is a 4M bit Serial Flash Memory, with advanced write protection mechanisms, accessed by a high speed SPI-compatible bus.
The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction.
The memory is organized as 8 blocks, each containing 16 sectors. Each sector is composed of 16 pages. Each page is 256 bytes wide. Thus, the whole memory can be viewed as consisting of 2048 pages, or 524,288 bytes.
The whole memory can be erased using the Chip Erase instruction, a block at a time, using Block Erase instruction, or a sector at a time, using the Sector Erase instruction.

FEATURES
◾ Family of Serial Flash Memories
   - A25L040A: 4M-bit /512K-byte
◾ Flexible Sector Architecture with 4KB Sectors
   - Sector Erase (4K-bytes) in 200ms (typical)
   - Block Erase (64K-bytes) in 0.5s (typical)
◾ Page Program (up to 256 Bytes) in 2ms (typical)
◾ 2.7 to 3.6V Single Supply Voltage
◾ SPI Bus Compatible Serial Interface
◾ 100MHz Clock Rate (maximum)
◾ Advanced Protection Features
   - Software and Hardware Write-Protect
   - Top/Bottom, Block/Sector Array Protection
◾ Electronic Signatures
   - JEDEC Standard Two-Byte Signature
      A25L040A: (3013h)
   - RES Instruction, One-Byte, Signature, for Backward Compatibility
      A25L040A (12h)
◾ AEC-Q100 Grade 3 Certification
◾ Package Options
   - 8-pin SOP (150/209mil), 8-pin DIP (300mil), 8-pin TSSOP,
      8-pin USON (2*3mm) and 8-pin WSON (6*5mm)
   - All Pb-free (Lead-free) Products are RoHS2.0 Compliant