The Microchip AT28BV64B-20SU: A Robust Parallel EEPROM for 5V Systems

In the realm of non-volatile memory, parallel EEPROMs have long been the workhorses for systems requiring reliable, byte-alterable storage with a simple, fast interface. The Microchip AT28BV64B-20SU stands as a prime example of this enduring technology, offering a robust combination of capacity, performance, and ease of integration for 5V-based designs.

This device organizes its 64-Kbit storage as 8,192 words by 8 bits (8K x 8), providing ample space for critical data, calibration constants, boot code, or configuration parameters that must persist through power cycles. A key feature of this EEPROM is its 128-byte page write capability. This allows not only individual byte writes but also significantly faster write operations by permitting up to 128 bytes of data to be written in a single, internal self-timed cycle. This dramatically improves throughput when updating large blocks of data, a common task in many applications.

Operating from a single 5V ±10% power supply, the `AT28BV64B-20SU` is designed for direct compatibility with a vast array of microcontrollers, microprocessors, and logic families. The `-20SU` suffix denotes a maximum access time of 200ns, ensuring swift read operations that do not impede the performance of the host processor. The parallel interface provides a separate address and data bus, enabling direct memory access (DMA) and straightforward connection to most system buses.

Data integrity is further ensured through advanced control logic. The device incorporates both hardware and software data protection mechanisms. The hardware write protection feature activates when the supply voltage drops below a specific threshold, preventing erroneous writes during power transitions. Additionally, a software data protection protocol can be enabled, requiring a specific three-byte command sequence to initiate any write operation, safeguarding memory contents from accidental corruption by errant code.

Housed in a space-saving 28-lead SOIC (SO) package, this EEPROM is suitable for a wide range of industrial, automotive, and consumer applications where reliability under varying environmental conditions is paramount. Its enduring design makes it an ideal solution for both new designs and as a reliable replacement in legacy systems.

ICGOOODFIND: The Microchip AT28BV64B-20SU is a highly reliable and performant parallel EEPROM. Its 5V operation, 128-byte page write mode, and comprehensive data protection features make it an excellent choice for designers seeking a proven non-volatile memory solution for demanding embedded systems.

Keywords: Parallel EEPROM, 5V Operation, Page Write, Data Protection, Non-Volatile Memory.