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NM27C040

4,194,304-Bit (512K x 8) High Performance CMOS EPROM

Fairchild Semiconductor 

February 1999

NM27C040

4,194,304-Bit (512K x 8) High Performance

CMOS EPROM

General Description

The NM27C040 is a high performance, 4,194,304-bit Electrically

Programmable UV Erasable Read Only Memory. It is organized

as 512K words of 8 bits each. Its pin-compatibility with byte-wide

JEDEC EPROMs enables upgrades through 8 Mbit EPROMs.

The “Don’t Care” feature on VPP during read operations allows

memory expansions from 1M to 8 Mbits with no printed circuit

board changes.

The NM27C040 provides microprocessor-based systems exten-

sive storage capacity for large portions of operating system and

application software. Its 120ns access time provides high speed

operation with high-performance CPUs. The NM27C040 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 NM27C040 is manufactured using Fairchild’s advanced

CMOS AMG™ EPROM technology.

Block Diagram

VCC

GND

VPP

OE

CE/PGM

Output Enable,

Chip Enable, and

Program Logic

Features

s High performance CMOS

— 120, 150ns access time*

s Simplified upgrade path

—VPP is a “Don’t Care” during normal read operation

s Manufacturer’s identification code

s JEDEC standard pin configuration

— 32-pin PDIP

— 32-pin PLCC

— 32-pin CERDIP

*Note: New revision meets 70ns. Please check with factory for availability.

Data Outputs O0 - O7

Output

Buffers

Y Decoder

Y Gating

A0 - A18

Address

Inputs

X Decoder

4,194,304-Bit

Cell Matrix

AMG™ is a trademark of WSI, Inc.

© 1999 Fairchild Semiconductor Corporation

1

NM27C040 Rev. C.1

DS010836-1

www.fairchildsemi.com

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