M
Author:
AN671
The following product conversion decision tree will
assist in converting from the old to the new devices. In
order to properly convert to new products two items
need to be known about the application; the operating
voltage of the system and whether the memory is orga-
nized as x8 or x16.
Converting from 93LC56/56B/66/66B Devices to 93LC56A/56B/66A/66B Devices
Shannon Poulin
Microchip Technology Inc.
DESCRIPTION
This application note details the process of converting
from 93LC56, 93LC56B, 93LC66, and 93LC66B type
devices to Microchip’s new 93LC56A, 93LC56B,
93LC66A, and 93LC66B devices. The new devices
offer improved data polling, lower standby current,
lower operating current and are available in a small
8-pin TSSOP package. The new devices also offer fixed
device organization. For example, the “A” suffix on the
93LC56A indicates that the device is organized as x8
only. The “B” suffix indicates that the 93LC56B is orga-
nized as x16 only.
The new devices also incorporate power protection cir-
cuitry that adds extra data protection when powering
the device up and down. The 93LCxxA/B devices are
designed to function as 2.5V-6.0V parts. The internal
voltage-detect circuit inhibits writes at < 2.2V nominally.
The operational parameters of the old and new devices
are outlined below.
Part Number Organization
93LC56
x8 or x16
93LC56B
x16 only
93LC66
x8 or x16
93LC66B
x16 only
93AA56
x8 or x16
93AA66
x8 or x16
93LC56A
NEW
x8 only
93LC56B
NEW
x16 only
93LC66A
NEW
x8 only
93LC66B
NEW
x16 only
Operating Range
2.0V-6.0V
2.0V-6.0V
2.0V-6.0V
2.0V-6.0V
1.8V-6.0V
1.8V-6.0V
2.5V-6.0V
2.5V-6.0V
2.5V-6.0V
2.5V-6.0V
PRODUCT CONVERSION
DECISION TREE
CURRENTLY USING
93LC56/93LC56B
OR
93LC66/93LC66B
2.5V
TO
6.0V?
NO
YES
ORG?
X16
USE 93LC56B
OR 93LC66B
X8
USE 93LC56A
OR 93LC66A
USE 93AA56
OR 93AA66
©
1997 Microchip Technology Inc.
DS00671A-page 1
Note the following details of the code protection feature on PICmicro
®
MCUs.
•
•
•
The PICmicro family meets the specifications contained in the Microchip Data Sheet.
Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowl-
edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
•
•
•
If you have any further questions about this matter, please contact the local sales office nearest to you.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
K
EE
L
OQ
, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro
®
8-bit MCUs, K
EE
L
OQ
®
code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
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