The AT27C4096 is a low-power, high-performance 4,194,304-bit one-time programmable read-only memory (OTP EPROM) organized 256K by 16 bits. It requires a single 5V power supply in normal read mode operation. Any word can be accessed in less than 55 ns, eliminating the need for speed-reducing WAIT states. The x16 organization makes this part ideal for high-performance 16- and 32-bit microprocessor systems. In read mode, the AT27C4096 typically consumes 15 mA. Standby mode supply current is typically less than 10 µA. The AT27C4096 is available in industry-standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, and VSOP packages. The device features two-line control (CE, OE) to eliminate bus contention in high-speed systems. With high density 256K word storage capability, the AT27C4096 allows firmware to be stored reliably and to be accessed.
The AT27C4096 is a low‑power, high‑performance 4‑Mbit one‑time programmable (OTP) EPROM organized as 256K × 16 bits. It operates from a single 5 V supply and offers fast read access (55 ns) suitable for 16‑ and 32‑bit microprocessor systems. The device includes an integrated product identification code and supports rapid programming (≈50 µs/word).
Key features include low standby current, high ESD protection, multiple JEDEC‑standard packages (40‑lead PDIP, 44‑lead PLCC, 40‑lead VSOP), and a wide industrial temperature range. Detailed pin configurations, timing diagrams, and absolute maximum ratings are provided for system designers.
| Read Access Time | 55 ns |
|---|---|
| Standby Current | < 10 A |
| Active Current (5 MHz) | 40 mA |
| Supply Voltage | 5 V ±10 % |
| ESD Protection | 2000 V |
| Latchup Immunity | 200 mA |
| Operating Temperature Range | -55 °C to +125 °C |
| Input Low Voltage | -0.6 V |
| Input High Voltage | 2.0 V + 0.5 V |
| Programming Time | ≈50 µs/word |
| Package Options | 40‑lead PDIP, 44‑lead PLCC, 40‑lead VSOP |
The device provides a read access time of 55 ns.
It operates from a 5 V supply with a ±10 % tolerance.
The EPROM is offered in 40‑lead PDIP, 44‑lead PLCC, and 40‑lead VSOP packages.
Standby mode supply current is typically less than 10 A.