The NM27P040 is a 4096K Processor Oriented EPROM (POPTM) configured as 512K x 8. It is designed to simplify microprocessor interfacing while remaining compatible with standard EPROMs. It can reduce both wait states and glue logic when the specification improvements are taken advantage of in the system design. The NM27P040 is implemented in National’s advanced CMOS EPROM process to provide a reliable solution and access times as fast as 120 ns. The interface improvements address two areas to eliminate the need for additional devices to adapt the EPROM to the microprocessor and to eliminate wait states at the termination of the access cycle. Even with these improvements, the NM27P040 remains compatible with industry standard JEDEC pinout EPROMs. The time from CE or OE being negated until the outputs are guaranteed to be in the high impedance state has been reduced to eliminate the need for wait states at the termination of the memory cycle and the data-out hold time has been extended to eliminate the need to provide data hold time for the microprocessor by delaying control signals or latching and holding the data in external latches.
The NM27P040 is a 4,194,304‑bit (512K × 8) processor‑oriented CMOS EPROM designed for fast access and simplified microprocessor interfacing. It offers a 120 ns access time, extended data‑hold time and JEDEC‑compatible pinout, making it suitable for a wide range of embedded applications.
The document provides electrical characteristics, absolute maximum ratings, programming algorithms, erasure procedures, mechanical dimensions and manufacturer identification information, along with recommended system‑level decoupling and power‑supply guidelines.
| Access Time | 120 ns |
|---|---|
| Package Types | QXXX (Quartz‑Windowed Ceramic DIP) |
| Commercial Temperature Range | 60 °C to +70 °C |
| Military Temperature Range | -55 °C to +125 °C |
| Memory Size | 4,194,304 bits (512 K × 8) |
| Manufacturer’s Identification Code | 8F08 |
| Physical Package | 32‑Lead EPROM Ceramic Dual‑In‑Line (JQ) |
The NM27P040 has an access time of 120 ns.
It stores 4,194,304 bits, organized as 512 K × 8.
The identification code is 8F08.