Unveiling the AT27C256R-45PU: A High-Performance 256K OTP EPROM Solution

In the realm of embedded systems and legacy hardware design, the need for reliable, non-volatile memory remains paramount. The AT27C256R-45PU from Microchip Technology stands as a robust and efficient solution in this space. This integrated circuit is a 256K (32K x 8) One-Time Programmable (OTP) EPROM, engineered for applications requiring permanent data storage with high noise immunity and low power consumption.

The "45" in its part number signifies a key performance characteristic: a maximum access time of 45ns. This speed is critical for systems operating with high-performance microprocessors, ensuring the memory can serve data without introducing wait states, thereby maintaining optimal system throughput. Housed in a industry-standard 28-lead PDIP (Plastic Dual In-line Package), the device is designed for easy prototyping and integration into a wide array of computing and industrial control systems.

A defining feature of the AT27CC256R-45PU is its One-Time Programmable (OTP) nature. Unlike EEPROM or Flash memory, data written to this EPROM is permanent and cannot be electrically erased. This makes it an exceptionally secure choice for storing final application code, boot loaders, firmware, or lookup tables that must remain immutable for the entire operational life of the product. The programming process is straightforward, typically requiring a dedicated EPROM programmer, after which the data is retained indefinitely.

The device operates on a single 5-volt power supply, drawing a low active current and an even lower standby current, making it suitable for power-sensitive designs. Its compatibility with the JEDEC standard pinout ensures it is a drop-in replacement for other EPROMs of the same density, offering designers flexibility and a clear migration path.

ICGOOODFIND: The AT27C256R-45PU is a quintessential high-speed OTP EPROM memory IC, offering designers a perfect blend of performance, data permanence, and reliability for critical embedded applications.

Keywords:

OTP EPROM

45ns Access Time

Non-Volatile Memory

32K x 8 Organization

5V Operation