Intel PA28F400B5B60: A Technical Overview of the 5V Flash Memory Chip
The Intel PA28F400B5B60 represents a significant milestone in the evolution of non-volatile memory technology. As a member of Intel's renowned ETOX™ (EPROM Tunnel Oxide) flash memory family, this chip is engineered for systems requiring reliable, high-performance storage with a single 5V power supply. Its architecture and feature set cater to a wide range of applications, from embedded systems and telecommunications equipment to industrial controllers and automotive electronics.
A primary characteristic of this device is its 5V single power supply operation, which simplifies system design by eliminating the need for additional voltage regulators commonly required for lower-voltage chips. This feature, combined with its 400Kbit (512Kb) organization—configured as 512K x 8 or 256K x 16—provides substantial flexibility for both 8-bit and 16-bit data bus microprocessors. The chip's access time is sufficiently fast to support many contemporary microcontrollers without wait states, enhancing overall system performance.
The PA28F400B5B60 is built on a highly reliable flash technology. It offers a minimum of 100,000 program/erase cycles per sector, ensuring robust endurance for frequently updated code or data storage. Data retention is specified at up to 10 years, a critical factor for long-lifecycle products. The memory array is divided into multiple sectors, allowing for individual sector erase operations. This means specific blocks of data can be rewritten without affecting the entire chip, drastically improving efficiency during firmware updates.
Programming and erasing are managed through a command user interface (CUI), which allows standard microprocessor write sequences to control the internal algorithms. This interface simplifies the integration process for developers. Furthermore, the chip incorporates several hardware and software data protection features, including a hardware-based write protection pin that, when asserted, prevents any accidental program or erase commands from modifying the memory content.
In terms of packaging, the device is commonly available in industry-standard packages like the 40-lead TSOP (Thin Small Outline Package), making it suitable for space-constrained PCB designs. Its industrial temperature range support ensures reliable operation in harsh environmental conditions.
ICGOOODFIND
The Intel PA28F400B5B60 is a robust and versatile 5V flash memory solution, prized for its sector erase capability, high endurance, and simple integration. It stands as a reliable choice for developers designing systems that demand non-volatile memory with a single power rail and long-term data integrity.
Keywords: Flash Memory, 5V Operation, Sector Erase, Command User Interface (CUI), Non-Volatile Storage
