NM27C256 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – 262,144-Bit (32K x 8) High Performance CMOS EPROM

July 1998
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 Fairchild’s latest CMOS split gate
EPROM technology which enables it to operate at speeds as fast
as 90 ns access time over the full operating range.
The NM27C256 provides microprocessor-based systems exten-
sive storage capacity for large portions of operating system and
application software. Its 90 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 pinout
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
s High performance CMOS
— 90 ns access time
s JEDEC standard pin configuration
— 28-pin PDIP package
— 32-pin chip carrier
— 28-pin CERDIP package
s Drop-in replacement for 27C256 or 27256
s Manufacturer’s identification code
Block Diagram
VCC
GND
VPP
OE
CE/PGM
Output Enable
and Chip Enable Logic
Data Outputs O0 - O7
Output
Buffers
Y Decoder
A0 - A14
Address
Inputs
X Decoder
Y Gating
© 1998 Fairchild Semiconductor Corporation
1
DS010833-1
www.fairchildsemi.com