AT27C256R-70JU: High-Speed 256K OTP EPROM for Embedded Systems

In the realm of embedded systems, where reliability, longevity, and deterministic performance are paramount, the choice of non-volatile memory is critical. The AT27C256R-70JU stands out as a dedicated solution, offering a robust architecture for storing immutable code and data. As a 256K-bit One-Time Programmable (OTP) EPROM, this device provides a perfect balance of speed, density, and cost-effectiveness for a wide array of industrial, automotive, and consumer applications.

The core advantage of the AT27C256R-70JU lies in its OTP nature. Unlike flash memory, which can be reprogrammed thousands of times, the contents of this EPROM are permanently written—or "burned"—into the silicon. This inherent characteristic makes it immune to software-based corruption or accidental erasure, ensuring the integrity of the firmware throughout the product's lifecycle. This is especially crucial for safety-critical systems and applications deployed in remote or harsh environments where data stability is non-negotiable.

Performance is another key strength. The "-70" suffix in its part number denotes an access time of 70 nanoseconds, classifying it as a high-speed memory component. This rapid read capability allows microprocessors to fetch instructions and data with minimal wait states, which is essential for maintaining high system throughput and real-time responsiveness in demanding embedded designs. The device is organized as 32,768 words by 8 bits (32K x 8), a standard byte-wide configuration that simplifies interface design with most common microcontrollers and microprocessors.

Housed in a 32-lead PLCC (Plastic Leaded Chip Carrier) package, the AT27C256R-70JU is designed for compactness and reliable surface-mount assembly. Its operation is straightforward, requiring a single +5V power supply, which aligns with the voltage requirements of most modern digital logic circuits. Furthermore, it features a low power consumption mode, reducing current draw significantly when the chip is not selected, a vital feature for power-sensitive applications.

ICGOODFIND: The AT27C256R-70JU is a high-performance OTP EPROM that delivers an optimal combination of permanent data retention, high-speed access, and design simplicity. It remains a trusted and effective solution for storing final production firmware, boot code, lookup tables, and other immutable parameters, guaranteeing unwavering performance for the lifetime of the embedded system.

Keywords: OTP EPROM, Embedded Systems, High-Speed Memory, Non-Volatile Memory, Firmware Storage.