The AT27BV040 chip is a high performance, low power, low voltage, 4,194,304-bit one-time programmable read only memory (EPROM) organized as 512K by 8 bits. It requires only one supply in the range of 2.7 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 byte can be accessed in less than 100 ns. With a typical power dissipation of only 18 mW at 5 MHz and VCC = 3V, the AT27BV040 consumes less than one fifth the power of a standard 5V EPROM. Standby mode supply current is typically less than 1 µA.
The AT27BV040 is a 4‑Megabit (512K × 8) one‑time programmable EPROM that operates from a single supply voltage of 2.7 V to 3.6 V, with an optional 5 V + 10 % range. It offers fast read access (120 ns), low standby current and high reliability features such as 2 kV ESD protection.
The document lists pin assignments, switching considerations, timing diagrams, absolute maximum ratings, and detailed DC/AC electrical characteristics. Package options include 32‑lead PLCC, TSOP and VSOP, with full mechanical dimensions and recommended decoupling components for stable operation.
| Read Access Time | 120 ns |
|---|---|
| Supply Voltage Range | 2.7 V to 3.6 V (or 5 V + 10 %) |
| Active Power Consumption | 36 mW at 5 MHz |
| Standby Current | < 1 µA typical |
| ESD Protection | 2 kV |
It operates from 2.7 V to 3.6 V, and also supports a standard 5 V + 10 % supply range.
The device provides a fast read access time of 120 ns.
Typical active power consumption is 36 mW at 5 MHz.
The EPROM is offered in 32‑lead PLCC, 32‑lead TSOP, and 32‑lead VSOP packages.