The AT27C040 is a low-power, high-performance, 4,194,304-bit one-time pro- grammable read-only memory (OTP EPROM) organized as 512K by 8 bits.
The AT27C040 is a low‑power, high‑performance 4,194,304‑bit one‑time programmable (OTP) EPROM that operates from a single 5 V supply. It offers fast 70 ns read access, 100 pA standby current, and 30 mA active current at 5 MHz, making it suitable for high‑speed microprocessor systems.
The device is supplied in standard JEDEC‑approved 32‑lead PDIP, PLCC, and TSOP packages and includes features such as 2000 V ESD protection, 200 mA latchup immunity, and a rapid programming algorithm of 100 ps/byte. Detailed electrical characteristics, pin configurations, timing diagrams, and absolute maximum ratings are provided for design integration.
| Memory size | 4,194,304 bits (4 Mbit) |
|---|---|
| Read access time | 70 ns |
| Standby current | 100 pA max |
| Active current (5 MHz) | 30 mA max |
| Supply voltage | 5 V ±10 % |
| Operating temperature range | -40 °C to 85 °C |
| ESD protection | 2000 V |
| Latchup immunity | 200 mA |
| Programming speed | 100 ps/byte (typical) |
| Programming supply current | 40 mA |
The device provides a fast read access time of 70 ns.
Standby current is limited to a maximum of 100 pA.
The EPROM operates from a 5 V supply with a ±10 % tolerance.
It is offered in 32‑lead PDIP, 32‑lead PLCC, and 32‑lead TSOP packages.