FEATURES
 Industry Standard Serial Interface
- IS25LQ040B: 4Mbit/512Kbyte
- IS25LQ020B: 2Mbit/256Kbyte
- IS25LQ010B: 1Mbit/128Kbyte
- IS25LQ512B: 512Kbit/64Kbyte
- IS25LQ025B: 256Kbit/32Kbyte
- 256-bytes per Programmable Page Standard
- Standard SPI/Dual/Quad Multi-I/O SPI
- Supports Serial Flash Discoverable Parameters (SFDP)
 High Performance Serial Flash (SPI)
- 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 cycles
- More than 20-year data retention
 Efficient Read and Program modes
- Low Instruction Overhead Operations
- Continuous data read with Byte Wrap around
- 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 Kbyte, or Chip Erase
- Standard Page Program 1 to 256 bytes
- Program/Erase Suspend and Resume
 Low Power with Wide Temp. Ranges
- Single 2.3V to 3.6V Voltage Supply
- 10 mA Active Read Current
- 8 μA Standby Current
- Deep Power Down
- Temp Grades:
Extended: -40°C to +105°C
Auto Grade (A3): -40°C to +125°C
 Advanced Security Protection
- Software and Hardware Write Protection
- 4x256-Byte dedicated security area with user-lockable bits, (OTP) One Time Programmable Memory
- 128 bit Unique ID for each device (Call Factory)
 Industry Standard Pin-out & Pb-Free Packages1
- JB = 8-pin SOIC 208mil
- JN = 8-pin SOIC 150mil
- JD = 8-pin TSSOP
- JV = 8-pin VVSOP 150mil
- JK = 8-contact WSON 6x5mm
- JU = 8-contact USON 2x3mm
- KGD (Call Factory)

GENERAL DESCRIPTION
The IS25LQ040B/020B/010B/512B/025B (4M/2M/1M/512K/256Kbit) 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 device 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 multifunction 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.
The memory array is organized into programmable pages of 256-bytes each. The device supports page program mode where 1 to 256 bytes of data can be programmed into the memory with one command. Pages can be erased in groups of 4Kbyte sectors, 32Kbyte blocks, 64Kbyte blocks, and/or the entire chip. The uniform sectors and blocks allow greater flexibility for a variety of applications requiring solid data retention.
The device supports the standard Serial Peripheral Interface (SPI), Dual/Quad output (SPI), and Dual/Quad I/O (SPI). Clock frequencies of up to 104MHz for all read modes allow for equivalent clock rates of up to 416MHz (104MHz x 4) which equates to 52Mbytes/S of throughput. These transfer rates can outperform 16-bit Parallel Flash memories allowing for efficient memory access for a XIP (execute in place) operation. The device is manufactured using industry leading non-volatile memory technology and offered in industry standard lead-free packages. See Ordering Information for the density and package combinations available.