27C256 Datasheet, PDF (1/12 Pages) Microchip Technology – 256K (32K x 8) CMOS EPROM

December 1993
NM27C256
262 144-Bit (32K x 8) High Performance CMOS EPROM
General Description
The NM27C256 is a 256K Electrically Programmable Read
Only Memory It is manufactured in National’s latest CMOS
split gate EPROM technology which enables it to operate at
speeds as fast as 120 ns access time over the full operating
range
The NM27C256 provides microprocessor-based systems
extensive storage capacity for large portions of operating
system and application software Its 120 ns access time
provides high speed operation with high-performance CPUs
The NM27C256 offers a single chip solution for the code
storage requirements of 100% firmware-based equipment
Frequently-used software routines are quickly executed
from EPROM storage greatly enhancing system utility
The NM27C256 is configured in the standard EPROM pin-
out which provides an easy upgrade path for systems which
are currently using standard EPROMs
The NM27C256 is one member of a high density EPROM
Family which range in densities up to 4 Mb
Features
Y _{High performance CMOS}
120 ns access time
Y _{JEDEC standard pin configuration}
28-pin DIP package
32-pin chip carrier
Y _{Drop-in replacement for 27C256 or 27256}
Y _{Manufacturer’s identification code}
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
HPCTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL D 10833
TL D 10833 – 1
RRD-B30M65 Printed in U S A