The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM). It features fast read access time and low-power CMOS operation. The product is available in industrial and automotive temperature ranges, and comes in various package options.
The AT27C256R is a low‑power, high‑performance 256‑Kbit one‑time programmable EPROM offered by Atmel. It operates from a single 5 V supply and provides fast read access with less than 45 ns access time, making it suitable for high‑speed microprocessor systems.
Key features include a rapid programming algorithm (typical 100 µs/byte), industrial and automotive temperature ranges, multiple JEDEC‑standard package options, and an integrated product identification code for easy programming equipment selection. The datasheet details electrical characteristics, pin configurations, timing diagrams, and absolute maximum ratings for designers.
| Read Access Time | 45 ns |
|---|---|
| Supply Voltage | 5 V ±10 % |
| Programming Time | 100 µs/byte (typical) |
| Package Options | 28‑lead PDIP, 32‑lead PLCC, 28‑lead TSOP, SOIC |
The device provides a read access time of 45 ns.
It operates from a 5 V supply with a ±10 % tolerance.
The part is offered in 28‑lead PDIP, 32‑lead PLCC, 28‑lead TSOP, and SOIC packages.