The AT27BV256 is a high-performance, low-power, low-voltage 262,144-bit one-time programmable read-only memory (OTP EPROM) organized as 32K by 8 bits. It requires only one supply in the range of 2.7V to 3.6V in normal read mode operation, making it ideal for fast, portable systems using either regulated or unregulated battery power. Atmel’s innovative design techniques provide fast speeds that rival 5V parts while keeping the low power consumption of a 3V supply. At VCC = 2.7V, any word can be accessed in less than 70 ns. With a typical power dissipation of only 18 mW at 5 MHz and VCC = 3V, the AT27BV256 consumes less than one fifth the power of a standard 5V EPROM. Standby mode supply current is typically less than 1
The AT27BV256 is a 256‑Kbit (32K × 8) one‑time programmable EPROM that operates from a single supply voltage of 2.7 V to 3.6 V. It offers fast read access (≤70 ns) and ultra‑low standby current (<1 pA), making it suitable for battery‑powered portable systems.
The device is available in JEDEC‑standard PLCC, SOIC and TSOP packages and includes features such as a rapid programming algorithm, integrated product identification code, and dual‑voltage compatibility with both 3 V and 5 V logic levels.
| Supply voltage range | 2.7 V – 3.6 V |
|---|---|
| Read access time | ≤ 70 ns |
| Standby current | < 1 pA |
| Active power consumption | ≈ 18 mW at 5 MHz, 3 V |
| Operating temperature range | -40 °C – +85 °C |
| Package types | 32‑lead PLCC, 28‑lead SOIC, 28‑lead TSOP |
The device provides a read access time of 70 ns.
It operates from a single supply voltage between 2.7 V and 3.6 V.
Standby current is typically less than 1 pA at 3 V.
The part is offered in 32‑lead PLCC, 28‑lead SOIC, and 28‑lead TSOP packages.