NM27C256: 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

  - High performance CMOS
         120 ns access time
  - JEDEC standard pin configuration
         28-pin DIP package
         32-pin chip carrier
  - Drop-in replacement for 27C256 or 27256
  - Manufacturer’s identification code