NM27P040

The NM27P040 is a 4096K Processor Oriented EPROM (POPTM) configured as 512K x 8. It's 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 of NM27P040 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 of NM27P040 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 of NM27P040 and the data-out hold time has been extended to eliminate the need to provide data hold time for the microprocessor delaying control signals or latching and holding the data external latches.