Intel PC28F256P30T85: A Comprehensive Technical Overview of the 256-Megabit Flash Memory Chip

The Intel PC28F256P30T85 represents a significant milestone in the evolution of non-volatile memory, embodying the advanced technology of its era for demanding embedded and industrial applications. As a 256-megabit (32-megabyte) StrataFlash® memory device, it combines high density with robust performance, making it a cornerstone for systems requiring reliable, long-term data storage.

Fabricated on a 0.13-micron process technology, this chip leverages Intel's innovative Multi-Level Cell (MLC) architecture. Unlike single-level cell (SLC) flash that stores one bit per cell, MLC technology stores two bits per cell, effectively doubling the density without a proportional increase in die size. This makes the PC28F256P30T85 a cost-effective solution for high-capacity storage needs. The device is organized as 32 Megabytes x 8 or 16 Megabytes x 16, providing design flexibility for both 8-bit and 16-bit microprocessor systems.

A key feature of this memory chip is its asynchronous page-mode operation. This architecture allows for significantly faster read times by permitting rapid access to data within a previously selected "page" of memory. With a page read access time of just 25ns and a standard random access time of 85ns, it delivers a substantial performance boost for code execution and data retrieval compared to standard asynchronous memories.

The PC28F256P30T85 operates on a versatile 2.7V to 3.6V voltage supply, typical for its generation, ensuring compatibility with a wide range of system power designs. Its endurance and data retention are critical for its target markets. The chip is rated for a minimum of 100,000 program/erase cycles per block, guaranteeing robust write capability over the product's lifetime. Furthermore, it can retain data integrity for up to 20 years, a vital characteristic for applications where firmware or critical parameters cannot be lost.

To ensure the highest levels of data protection and system integrity, the device incorporates several advanced features. The Advanced Sector Protection mechanism offers a hardware-based locking system to prevent accidental modification or erasure of critical code sectors. Command Locking prevents unauthorized writes, while a 64-bit Protection Register provides a unique identifier for security and inventory management. Built-in program and erase algorithms automate complex operations, simplifying the software driver development and minimizing the risk of errors.

Target applications are widespread, including telecommunications infrastructure (routers, switches), networking equipment, industrial control and automation systems, automotive systems, and high-end consumer electronics. In these fields, the combination of density, performance, and reliability is paramount.

ICGOODFIND: The Intel PC28F256P30T85 is a high-density, industrial-grade flash memory solution that masterfully balances capacity, speed, and unwavering reliability. Its MLC architecture, fast page-mode reads, and comprehensive suite of data protection features solidified its position as a trusted component for a generation of sophisticated embedded systems.

Keywords:

1. StrataFlash® Memory

2. Multi-Level Cell (MLC)

3. Asynchronous Page-Mode

4. Advanced Sector Protection

5. Program/Erase Endurance