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NM27P040QE170 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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NM27P040QE170 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  TLD11367 December 1993 NM27P040 4194304-Bit (512K x 8) Processor Oriented CMOS EPROM General Description 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 advan- tage of in the system design The NM27P040 is implement- ed in National’s advanced CMOS EPROM process to pro- vide 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 termina- tion 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 Features Y Fast output turn off to eliminate wait states Y Extended data hold time for microprocessor compatibility Y High performance CMOS 120 ns access time Y JEDEC standard pin configuration Y Manufacturer’s identification code Block Diagram TLD11367 – 1 TRI-STATE is a registered trademark of National Semiconductor Corporation POPTM is a trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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