Microchip Technology, Inc. EPROM AT27C256R-45PU

The AT27C256R-45PU is a low-power, one-time programmable read-only memory (OTP EPROM) with a storage capacity of 256K bits, organized as 32K by 8 bits. It operates with a single 5V power supply and features a fast read access time of 45ns, making it suitable for high-performance microprocessor systems without the need for WAIT states. The device consumes a maximum of 20mA during active operation at 5MHz and only 100µA in standby mode. This memory chip is available in industry-standard 28-lead PDIP and 32-lead PLCC packages, ensuring compatibility with various designs. It incorporates a rapid programming algorithm that allows for programming times of approximately 100µs per byte. The AT27C256R also includes features such as CMOS- and TTL-compatible inputs and outputs, an integrated product identification code, and high reliability with 2,000V ESD protection and 200mA latchup immunity. Operating temperature ranges are suitable for industrial and automotive applications, and the product is offered in a green packaging option that is free from lead and halides. This combination of features makes the AT27C256R-45PU a reliable choice for applications requiring efficient firmware storage and retrieval.