Intel JS28F256P33BF: A Detailed Technical Overview of the 256-Megabit Parallel NOR Flash Memory
The Intel JS28F256P33BF stands as a significant component in the landscape of non-volatile memory solutions, representing a high-density, high-performance 256-megabit Parallel NOR Flash memory device. Engineered for applications demanding reliable code storage and fast execution, this memory chip is a cornerstone in systems where boot integrity, data retention, and rapid read access are paramount.
Architectural Foundation and Density
Organized as 32M x 8 bits or 16M x 16 bits, the 256-megabit (32-megabyte) density provides ample storage for complex boot code, operating systems, and application firmware in embedded systems. Its parallel interface (x8 or x16) is a key differentiator, enabling wide data paths that are essential for achieving the high throughput necessary for Execute-In-Place (XIP) operations. This allows the host processor to run code directly from the flash memory without the need to first shadow it into RAM, significantly reducing system boot times and simplifying memory hierarchy.
Core Performance Characteristics
A defining feature of the JS28F256P33BF is its access speed. With a fast 90ns initial access time and the capability to operate at a 66MHz burst frequency in synchronous mode, it delivers the high bandwidth required by modern high-performance microprocessors, microcontrollers, and DSPs. The device supports both asynchronous and synchronous read modes, offering design flexibility. Its page mode read feature further enhances performance by allowing rapid sequential access within a selected page of memory.
Advanced Command Set and Reliability
Built on Intel's proven StrataFlash® embedded memory technology, this device features a sophisticated command-set architecture that simplifies writing and erasing operations. Unlike simple memory-mapped devices, it requires specific command sequences to initiate functions like program/erase, protecting against accidental data corruption. The integration of Advanced Sector Protection mechanisms offers robust security, allowing individual sectors to be permanently locked to prevent unauthorized code modification. Furthermore, it includes a 128-bit Protection Register for storing unique device and system information securely.
Voltage and Power Management
The "P33" in its part number signifies its core voltage requirement of 3.3V ± 0.3V for all operations, including read, program, and erase. This makes it compatible with the I/O voltages of a vast array of modern processors. The device also incorporates sophisticated power management features, including a deep power-down mode that drastically reduces current consumption to a mere fraction of standby current, which is critical for battery-powered or energy-sensitive applications.
Endurance and Data Retention
The JS28F256P33BF is designed for long-term reliability, supporting a minimum of 100,000 program/erase cycles per sector. This endurance ensures the device can withstand frequent firmware updates over the lifetime of the product. Data retention is specified at an impressive 20 years, guaranteeing that stored code and critical data remain intact for decades without power.
Target Applications
This combination of features makes the Intel JS28F256P33BF ideal for a wide range of demanding applications. It is commonly found in:
Networking Equipment: Routers, switches, and modems for storing boot code and firmware.
Industrial Control and Automation Systems: Where reliability and long-term availability are critical.
Telecommunications Infrastructure: Base stations and network controllers.
Automotive Systems: Engine control units (ECUs) and infotainment systems.
Consumer Electronics: Digital cameras, printers, and set-top boxes.
ICGOOODFIND
The Intel JS28F256P33BF is a premier choice for designers seeking a high-performance, reliable, and secure parallel NOR Flash solution. Its robust architecture, fast synchronous and asynchronous read capabilities, and advanced security features make it exceptionally well-suited for critical embedded systems that require fast boot times, in-place code execution, and unwavering data integrity over extended product lifecycles.
Keywords: Parallel NOR Flash, Execute-In-Place (XIP), 256-Megabit, StrataFlash, Sector Protection
