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NM27C256 Schematic ( PDF Datasheet ) - National

Teilenummer NM27C256
Beschreibung 262 /144-Bit (32K x 8) High Performance CMOS EPROM
Hersteller National
Logo National Logo 




Gesamt 12 Seiten
NM27C256 Datasheet, Funktion
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






NM27C256 Datasheet, Funktion
Fast Programming Algorithm Flow Chart
FIGURE 1
6
TL D 10833 – 6

6 Page









NM27C256 pdf, datenblatt
Physical Dimensions inches (millimeters) (Continued)
LIFE SUPPORT POLICY
32-Lead Plastic Leaded Chip Carrier (PLCC)
Order Number NM27C256VXXX
NS Package Number VA32A
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
systems which (a) are intended for surgical implant
into the body or (b) support or sustain life and whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling can
be reasonably expected to result in a significant injury
to the user
2 A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system or to affect its safety or
effectiveness
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National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

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