GENERAL DESCRIPTION

The Pm25LQ512/010/020/040B (512K/1M/2M/4Mbit) 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 Pm25xQ 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.

FEATURES

• Industry Standard Serial Interface

- Pm25LQ040B: 4Mbit/512Kbyte

- Pm25LQ020B: 2Mbit/256Kbyte

- Pm25LQ010B: 1Mbit/128Kbyte

- Pm25LQ512B: 512Kbit/64Kbyte

- 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 Kbytes, 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 Range:

-40°C to +85°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

- S = 8-pin SOIC 150mil

- D = 8-pin TSSOP

Note1: Pm25LQ040B (not available in D)