AT28BV256-20SU-T: A 5V-Compatible 256Kb Battery-Voltage Parallel EEPROM

In the realm of non-volatile memory, the ability to retain critical data through power cycles and across varying voltage conditions is paramount. The AT28BV256-20SU-T stands out as a specialized solution, merging the high-performance interface of parallel EEPROM with the low-voltage operation essential for battery-backed systems. This 256-kilobit memory device is engineered to serve as a reliable, low-power data vault in a wide array of applications, from industrial controls and medical instrumentation to legacy computing and telecommunications infrastructure.

The most defining feature of this IC is its 5V-tolerant operation in a battery-voltage environment. While the device is optimized for and typically powered by a 2.7V to 3.6V supply (compatible with lithium coin cell or battery pack outputs), its inputs and outputs are designed to be fully compatible with 5V logic levels. This is a critical advantage, as it allows the EEPROM to interface directly with older or industrial microcontrollers and logic circuits that operate on a 5V supply, eliminating the need for level-shifting circuitry. This not only simplifies board design and reduces component count but also enhances overall system reliability.

Organized as 32,768 words by 8 bits, the AT28BV256 offers a standard parallel interface for fast read and write operations. With an access time of 200ns (as denoted by the -20 speed grade), it provides sufficiently high performance for code shadowing and data storage tasks. The device guarantees a minimum endurance of 10,000 write cycles and offers a data retention period of over 10 years, ensuring long-term data integrity. Furthermore, it incorporates advanced data protection schemes, including both hardware and software write protection, to prevent accidental data corruption.

Packaged in a space-saving 28-lead SOIC (SU), it is well-suited for applications where board real estate is at a premium. Its low active and standby current consumption makes it an ideal candidate for power-sensitive, battery-powered designs.

ICGOODFIND: The AT28BV256-20SU-T is a strategically important component, offering a unique blend of 5V logic compatibility and low-voltage core operation. It serves as a vital bridge between modern low-power design requirements and legacy 5V system architectures, ensuring data persistence without complicating the design process.

Keywords: 5V-Tolerant, Battery-Voltage, Parallel EEPROM, Non-Volatile Memory, Low-Power.