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TL/D/10833

NM27C256 262,144-Bit (32K x 8) High Performance 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

Ð 120 ns access time

Y

JEDEC standard pin configuration

Ð 28-pin DIP package

Ð 32-pin chip carrier

Y

Drop-in replacement for 27C256 or 27256

Y

Manufacturer’s identification code

Block Diagram

TL/D/10833–1

TRI-STATE

É

is a registered trademark of National Semiconductor Corporation.

HPC

TM

is a trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M65/Printed in U. S. A.

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