GENERAL DESCRIPTION
The IS25WQ040/020 (4M/2Mbit) Serial Flash memory offers a storage solution with flexibility and performance in a simplified pin count package. ISSI’s “Industry Standard Serial Interface” is for systems that have limited space, pins, and power. The IS25WQ040/020 is accessed through a 4-wire SPI Interface consisting of a Serial Data Input (SI), Serial Data Output (SO), Serial Clock (SCK), and Chip Enable (CE#) pins, which also serve as multi-function I/O pins in Dual and Quad modes (see pin descriptions). The IS25xQ series of Flash is ideal for code shadowing to RAM, execute in place (XIP) operations, and storing non-volatile data.

FEATURES
• Industry Standard Serial Interface
   - IS25WQ040: 4M-bit/ 512K-byte
   - IS25WQ020: 2M-bit/ 256K-byte
   - 256-bytes per Programmable Page Standard
   - Standard SPI/Dual/Quad Multi-I/O SPI
• High Performance Serial Flash (SPI)
   - 33MHz SPI Normal Read
   - 104 MHz SPI/Dual/Quad Multi-I/O SPI
   - 416 MHz equivalent Quad SPI
   - 52MB/S Continuous Data Throughput
   - Supports SPI Modes 0 and 3
   - More than 100,000 erase/program cycles1
   - More than 20-year data retention
• Efficient Read and Program modes
   - Low Instruction Overhead Operations
   - Continuous data read
   - Allows XIP operations (execute in place)
   - Outperforms X16 Parallel Flash
• Flexible & Cost Efficient Memory Architecture
   - Uniform 4 Kbyte Sectors or 32/64 Kbyte Blocks
   - Flexible 4, 32, 64 K-bytes, or Chip Erase
   - Standard Page Program 1 to 256 bytes
   - Program/Erase Suspend and Resume
• Low Power with Wide Temp. Ranges
   - Single 1.65V to 1.95V Voltage Supply
   - 10 mA Active Read Current
   - 15 µA Standby Current
   - 2 µA Deep Power Down
   - Temp Grades:
      Extended: -40°C to +105°C
• Advanced Security Protection
   - Software and Hardware Write Protection
   - 256-Byte dedicated security area, One
      Time Programmable (OTP) Memory
   - 128 bit Unique ID for each device
• Industry Standard Pin-out & Pb-Free Packages2
   - JB = 8-pin SOIC 208mil
   - JN = 8-pin SOIC 150mil
   - JV = 8-pin VVSOP 150mil
   - JK = 8-contact WSON 6x5mm
   - JU = 8-contact USON 2x3mm
   - KGD (Call Factory)