GENERAL DESCRIPTION
   The EN25S40A is a 4 Megabit (512K-byte) Serial Flash memory, with advanced write protection mechanisms. The EN25S40A supports the standard Serial Peripheral Interface (SPI), and a high performance Dual output as well as Dual, Quad I/O using SPI pins: Serial Clock, Chip Select, Serial DQ0 (DI) and DQ1(DO), DQ2(WP#) and DQ3(HOLD#). SPI clock frequencies of up to 104MHz are supported allowing equivalent clock rates of 208MHz (104MHz x 2) for Dual Output and 416MHz (104MHz x 4) for Quad Output when using the Dual/Quad Output Fast Read instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction. S40A also offers a sophisticated method f

FEATURES
• Single power supply operation
   - Full voltage range: 1.65-1.95 volt
• Serial Interface Architecture
   - SPI Compatible: Mode 0 and Mode 3
• 4 M-bit Serial Flash
   - 4 M-bit / 512 KByte /2048 pages
   - 256 bytes per programmable page
• Standard, Dual or Quad SPI
   - Standard SPI: CLK, CS#, DI, DO, WP#, HOLD#
   - Dual SPI: CLK, CS#, DQ0, DQ1, WP#, HOLD#
   - Quad SPI: CLK, CS#, DQ0, DQ1, DQ2, DQ3
• High performance
   - 104MHz clock rate for one data bit
   - 104MHz clock rate for two data bits
   - 104MHz clock rate for four data bits
• Burst Modes
   - 8/16/32/64 linear burst with wrap-around
• Low power consumption
   - 5 mA typical active current
   - 1μA typical power down current
• Uniform Sector Architecture:
   - 128 sectors of 4-Kbyte
   - 16 blocks of 32-Kbyte
   - 8 blocks of 64-Kbyte
   - Any sector or block can be erased individually
• Software and Hardware Write Protection:
   - Write Protect all or portion of memory via
      software
   - Enable/Disable protection with WP# pin
• High performance program/erase speed
   - Page program time: 0.30ms typical
   - Sector erase time: 40ms typical
   - 32KB Block erase time 100ms typical
   - 64KB Block erase time 150ms typical
   - Chip erase time: 2 seconds typical
• Write Suspend and Write Resume
• Lockable 512 byte OTP security sector
• Support Serial Flash Discoverable
   Parameters (SFDP) signature
• Read Unique ID Number (Note) ※
• Minimum 100K endurance cycle
• Package Options
   - 8 pins SOP 150mil body width
   - 8 pins VSOP 150mil body width
   - 8 contact USON 2x3 mm
   - 8 contact VDFN 5x6 mm
   - All Pb-free packages are compliant RoHS,
      Halogen-Free and REACH.
• Industrial temperature Range