SST25PF040B-80-4C-QAE

SST25PF040B-80-4C-QAE is an SPI Flash memory integrated circuit (IC) developed by Microchip Technology. It is widely used in modern applications, especially those related to microcontrollers and embedded systems. This article provides an overview of the application field and the working principle of the SST25PF040B-80-4C-QAE.

Application Field

The SST25PF040B-80-4C-QAE is an 8-pin SPI Flash memory IC with a 2-megabyte (2M) capacity. It is a non-volatile memory IC that combines 8Kb of program memory, 0.5Kb of EEPROM memory, and 8Kb of data memory. It provides features like On-Chip Erase capabilities, write protection, and redundancy management that allow it to be used for various applications. The typical applications for SST25PF040B-80-4C-QAE include:

• Data storage
• Microcontroller boot-up code
• Code and firmware updates
• Embedded system code

The SST25PF040B-80-4C-QAE is an ideal IC for applications that require reliable non-volatile data storage. It offers several advantages over its predecessor, the SST25VF040B-80-4C-QAE, such as low power consumption, wide-temperature range operation, enhanced flexibility, and industry-standard command sets. It has a wide voltage range of 2.7V to 5.25V, an operating temperature range of -40°C to +85°C and an industry-leading write/erase endurance of up to 10000 cycles.

Working Principle

The SST25PF040B-80-4C-QAE has an asynchronous serial peripheral interface (SPI) that provides a simple, cost-effective way to transfer data between SPI-compatible devices. It is controlled via commands received through the device’s four-wire SPI bus. The most commonly used commands include Read, Fast Read, Page Program, Erase, Block Erase, Serial Write, Sequential Read, and Status Register read/write. All other commands are communicated through the devices’ four-wire General Purpose Input/Output (GPIO) pins. This approach allows for flexible memory control, with the added advantages of low power consumption and fast operation.

In order to successfully write or erase data in the SST25PF040B-80-4C-QAE, two separate commands are required: the Write Enable command and the Erase/Write command.The Write Enable command is issued to enable the device’s write or erase functions. After the Write Enable command is successfully issued, the device’s status register can be read in order to confirm that the device is ready to accept data. After the desired data is written or erased, the Write Disable command is issued to terminate O.P.E.N operations.

The SST25PF040B-80-4C-QAE’s internal architecture consists of a serial programmable logic array (PLA), a multi-bank page buffer, and a Flash ROM array. The PLA implements the basic operations for the chip, including data transfer, write/erase procedures, and register read/write operations. The Flash ROM array stores the data, code, and instruction, organized into blocks of 8Kb. The multi-bank page buffer enables faster program and erase operations and provides redundancy management, allowing the user to manage multiple erase and write cycles.

The SST25PF040B-80-4C-QAE is an 8-pin SPI Flash memory IC with a 2M capacity. It is used in various applications, ranging from data storage to microcontroller boot-up code and firmware updates. It utilizes an asynchronous serial interface and four-wire GPIO interface to control its operations. The chip’s internal architecture, consisting of a PLA, multi-bank page buffer, and Flash ROM array, enables faster, more efficient operations while ensuring reliable, non-volatile data storage.