AMATI COMMUNICATIONS CORP
S-3/A, 1996-03-07
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 7, 1996.

                                                      REGISTRATION NO. 333-01187
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            ------------------------

                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                            ------------------------

                        AMATI COMMUNICATIONS CORPORATION

             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                              <C>
           DELAWARE                 94-1675494
 (State or other jurisdiction    (I.R.S. employer
     of incorporation or          identification
        organization)                number)
</TABLE>

   3801 ZANKER ROAD, P.O. BOX 5143, SAN JOSE, CALIFORNIA 95150 (408) 433-3300
              (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)

                              JAMES E. STEENBERGEN
                        AMATI COMMUNICATIONS CORPORATION
          3801 ZANKER ROAD, P.O. BOX 5143, SAN JOSE, CALIFORNIA 95150
                                 (408) 433-3300
      (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)

           with copies of all orders, notices and communications to:
                                Richard A. Peers
                              Stephen C. Ferruolo
                        Heller Ehrman White & McAuliffe
       525 University Avenue, Palo Alto, California 94301 (415) 324-7000

                            ------------------------

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   As soon as practicable after the Registration Statement becomes effective.

                            ------------------------

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. / /

                            ------------------------

 If any of the securities being registered on this Form are to be offered on a
                             delayed or continuous
    basis pursuant to Rule 415 under the Securities Act of 1933, other than
                           securities offered only in
connection  with dividend  or interest  reinvestment plans,  check the following
box. /X/

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                        AMATI COMMUNICATIONS CORPORATION

              CROSS-REFERENCE SHEET BETWEEN ITEMS IN FORM S-3 AND
              PROSPECTUS PURSUANT TO ITEM 501(B) OF REGULATION S-K

<TABLE>
<CAPTION>
 ITEM NO.                    FORM S-3 CAPTION                                 HEADING IN PROSPECTUS
- ----------  --------------------------------------------------  --------------------------------------------------
<S>         <C>                                                 <C>
Item 1.     Forepart of Registration Statement and Outside
             Front Cover Page of Prospectus...................  Outside Front Cover Page of Prospectus

Item 2.     Inside Front and Outside Back Cover Pages of
             Prospectus.......................................  Available Information

Item 3.     Summary Information, Risk Factors and Ratio of
             Earnings to Fixed Charges........................  Recent Developments, Risk Factors

Item 4.     Use of Proceeds...................................  Use of Proceeds

Item 5.     Determination of Offering Price...................  Not Applicable

Item 6.     Dilution..........................................  Not Applicable

Item 7.     Selling Security Holders..........................  Selling Stockholders

Item 8.     Plan of Distribution..............................  Plan of Distribution

Item 9.     Description of Securities to be Registered........  Description of Capital Stock

Item 10.    Interests of Named Experts and Counsel............  Legal Matters; Experts

Item 11.    Material Changes..................................  Recent Developments

Item 12.    Incorporation of Certain Information by
             Reference........................................  Documents Incorporated by Reference

Item 13.    Disclosure of Commission Position on
             Indemnification for Securities Act Liabilities...  Information Not Required in the Prospectus
</TABLE>
<PAGE>
PROSPECTUS

                    3,544,954 SHARES ALL OF WHICH ARE BEING
                        SOLD BY THE SELLING STOCKHOLDERS

                        AMATI COMMUNICATIONS CORPORATION

    All  of the 3,544,954 shares (the "Shares") of Common Stock, $.20 par value,
(the "Common Stock") of Amati Communications Corporation (the "Company") offered
by this  prospectus (the  "Prospectus") are  being sold  by the  holders of  the
Shares   (each  individually,   a  "Holder"   and  collectively,   the  "Selling
Stockholders") named in this Prospectus. See "Selling Stockholders." The Company
will not receive  any of the  proceeds from the  sale of Shares  by the  Selling
Stockholders.

    The  Company has not made any  underwriting arrangements with respect to the
Shares. The Company's Common Stock is traded on the Nasdaq National Market under
the symbol "AMTX". On February 29, 1996, the closing price for the Common Stock,
as reported on the Nasdaq National Market, was $6.75.

    Shares covered by this Prospectus may be offered for sale from time to  time
by  the Selling  Stockholders at such  prices and on  such terms as  may then be
obtainable, in negotiated  transactions, or otherwise.  Each Holder has  entered
into  an agreement with the  Company that restricts the  right of such Holder to
offer or sell the Shares (each  an "Affiliate's Agreement" and collectively  the
"Affiliate's  Agreements").  In  addition,  pursuant  to  a  registration rights
agreement between the  Selling Stockholders and  the Company (the  "Registration
Rights  Agreement"), the Selling  Stockholders have agreed to  offer or sell the
Shares only during the period  commencing three days after  the date of a  press
release announcing the Company's quarterly earnings and generally ending 45 days
after such date and any other periods the Company allows trading by its officers
and directors ("Window Periods"). Pursuant to the Registration Rights Agreement,
the  Company has the right at any time not to open a Window Period or, during an
open Window  Period,  to  suspend offers  and  sales  of Shares.  See  "Plan  of
Distribution."

    This  Prospectus  may  be  used  by  the  Selling  Stockholders  or  by  any
broker-dealer who may  participate in  sales of securities  covered hereby.  The
Selling  Stockholders and  the brokers and  dealers through whom  such sales are
effected may be deemed to be underwriters  under the Securities Act of 1933,  as
amended   (the  "Securities  Act").  The   Selling  Stockholders  will  pay  all
commissions, transfer taxes,  and other  expenses associated with  the sales  of
securities  by them. Pursuant to the  Registration Rights Agreement, the Company
has paid the expenses of the preparation of this Prospectus and the Company  has
agreed  to  indemnify  the  Selling  Stockholders  against  certain liabilities,
including liabilities arising under the Securities Act.

    The Company  has filed  with  the Securities  and Exchange  Commission  (the
"Commission")  a Registration Statement under the Securities Act with respect to
the securities  offered  by this  Prospectus.  As  permitted by  the  rules  and
regulations  of  the Commission,  this Prospectus  does not  contain all  of the
information set  forth  in  the  Registration Statement  and  the  exhibits  and
schedules  thereto. For further information with  respect to the Company and the
securities offered hereby, reference is  made to the Registration Statement  and
the  exhibits  thereto,  which may  be  examined  without charge  at  the public
reference facilities maintained by the Commission at Judiciary Plaza, 450  Fifth
Street,  N.W., Washington, D.C. 20549, and copies  of which may be obtained from
the Commission upon payment of the prescribed fees.
                            ------------------------

            SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                             (SEE "RISK FACTORS.")
                             ---------------------

THESE SECURITIES HAVE NOT  BEEN APPROVED OR DISAPPROVED  BY THE SECURITIES  AND
 EXCHANGE   COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
   SECURITIES AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES  COMMISSION
     PASSED  UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS  PROSPECTUS.  ANY
                REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------

                  The date of this Prospectus is March 8, 1996
<PAGE>
    No  dealer, salesman, or  any other person  has been authorized  to give any
information or to make any representations or projections of future  performance
other  than those contained in this  Prospectus, and any such other information,
projections, or representations, if  given or made, must  not be relied upon  as
having been so authorized. The delivery of this Prospectus or any sale hereunder
at any time does not imply that the information herein is correct as of any time
subsequent  to its date. This Prospectus does not constitute an offer to sell or
a solicitation of an offer  to buy any of the  securities offered hereby in  any
jurisdiction where, and to any person to whom, it is unlawful to make such offer
or solicitation.

                             AVAILABLE INFORMATION

    The  Company is subject to the  informational requirements of the Securities
Exchange Act of 1934,  as amended (the "1934  Act") and in accordance  therewith
files  reports, proxy statements and other information with the Commission. Such
Registration Statement, reports, proxy statements  and other information can  be
inspected and copied at public reference facilities maintained by the Commission
at  Judiciary Plaza, 450  Fifth Street, N.W., Washington,  D.C. 20549. Copies of
such material can  be obtained  at prescribed  rates from  the Public  Reference
Section  of the Commission  at such address. Such  reports, proxy statements and
other information can also be inspected at the Commission's regional offices  at
7 World Trade Center, Suite 1300, New York, New York 10048 and 500 West Madison,
Chicago,  Illinois 60661, and at the offices  of the Nasdaq Stock Market at 9513
Key West Avenue, Rockville, Maryland 20850-3389.

                      DOCUMENTS INCORPORATED BY REFERENCE

    There are hereby incorporated in this Prospectus by reference the  following
documents  filed pursuant to  the 1934 Act:  (i) the Company's  Annual Report on
Form 10-K for the fiscal year ended July 29, 1995; (ii) the Company's  Quarterly
Report  on Form 10-Q  for the fiscal  quarter ended October  28, 1995; (iii) the
Company's Proxy  Statement  for  the  Annual Meeting  of  Shareholders  held  on
December  9, 1994; (iv) the Company's  Amendment No. 3 to Registration Statement
on Form S-4 (33-62023) filed with  the Commission on October 16, 1995,  relating
to  the merger of  the Company and the  former Amati Communications Corporation;
(v) the Company's Current Report on Form 8-K for November 28, 1995, as  amended;
and  (vi) the description of the Company's  securities contained in its form 8-A
Registration Statements filed pursuant to Section 12 of the 1934 Act.

    All documents filed by the Company  pursuant to Section 13(a), 13(c), 14  or
15(d)  of  the 1934  Act after  the date  of  this Prospectus  and prior  to the
termination of the offering of the securities offered hereby shall be deemed  to
be incorporated by reference in this Prospectus.

    The  Company hereby  undertakes to  provide without  charge to  each person,
including any  beneficial owner,  to whom  a copy  of this  Prospectus has  been
delivered, upon the written or oral request of such person, a copy of any or all
of  the documents referred  to above which  have been or  may be incorporated in
this Prospectus by reference,  other than exhibits to  such documents which  are
not  specifically  incorporated  by  reference into  the  information  that this
Prospectus incorporates. Requests for such  copies should be directed to:  Amati
Communications   Corporation,  3801  Zanker  Road,  P.O.  Box  5143,  San  Jose,
California 95150, Attention: Investor Relations, Telephone (408) 433-3300.

                                       2
<PAGE>
                              RECENT DEVELOPMENTS

    On November 28, 1995 the Company, formerly ICOT Corporation, and the  former
Amati  Communications Corporation ("Old Amati"), a privately held Mountain View,
California based company, completed the merger (the "Merger") by which Old Amati
became a wholly-owned subsidiary of the Company. In connection with the  Merger,
the  Company's name was changed from "ICOT Corporation" to "Amati Communications
Corporation" and on November 29, 1995 the trading symbol for the Company's stock
on the Nasdaq  National Market was  changed to "AMTX".  The Company's  principal
business  prior to  the Merger was  to develop, manufacture,  market and service
network connectivity  products for  sales to  end-users and  original  equipment
manufacturers;  the  business  of  Old  Amati  acquired  in  the  Merger  is the
development of  advanced  transmission  systems  utilizing  Discrete  Multi-tone
("DMT")  technology to  provide high  speed transmission  over copper  and cable
media. In 1993, Old Amati's DMT technology was selected as the American National
Standards Institute  ("ANSI") standard  for Asymmetric  Digital Subscriber  Line
("ADSL")  transmission  and, as  a result,  is recognized  as the  United States
standard for ADSL. Under  the terms of the  Merger Agreement, the  shareholders,
warrant  holders  and option  holders of  Old  Amati acquired  approximately 35%
(6,788,924) of  the fully  diluted shares  of the  Company. The  Company is  not
expected to operate profitably in the foreseeable future.

                                       3
<PAGE>
                                  RISK FACTORS

    The  information  about the  Company included  or incorporated  by reference
herein contains forward looking statements that involve risks and uncertainties,
including the risks detailed below. The Shares of Common Stock offered hereby by
the  Selling  Stockholders  involve  a  high  degree  of  risk  and  prospective
purchasers should carefully consider the following factors.

    EXPECTED  FUTURE LOSSES.   Due  in part  to the  Merger, the  Company is not
expected to  operate profitably  in the  foreseeable future.  In the  first  six
months  of fiscal 1996, the Company reported  a loss of $31,383,000, including a
one-time writeoff  of  $31,554,000  for  in  process  research  and  development
resulting  from the Merger. The  Company expects to continue  to incur losses in
future years.  There  can  be no  assurance  that  the Company  will  return  to
profitability.  Any  long-term  viability,  profitability  and  growth  from the
Company's technology will depend  upon successful commercialization of  products
resulting  from  its  research  and  product  development  activities. Extensive
additional research and development will be required prior to  commercialization
of  certain products. There can be no assurance that the Company will be able to
develop commercially viable products  from the technology, generate  significant
revenues and/or achieve profitability.

    NEED  FOR  ADDITIONAL CAPITAL.   The  Company's future  capital requirements
depend on  many  factors,  including  sales levels,  progress  in  research  and
development  programs, establishment  of collaborative agreements,  and costs of
manufacturing and commercialization  activities. The Company  secured a line  of
credit for $1,200,000 as of January 27, 1996. It is likely that the Company will
seek  additional funding through  collaborative agreements or  through public or
private sales  of its  securities. There  can be  no assurance  that  additional
funding  will be available on acceptable terms, if at all. If adequate funds are
not available, the Company could be required to curtail significantly or  defer,
temporarily or permanently, one or more of its research and development programs
or  to  obtain  funds  through  arrangements that  may  require  the  Company to
relinquish certain technology or product rights.

    MARKET FOR  ADSL PRODUCTS  STILL UNDER  DEVELOPMENT; PRINCIPAL  ADSL  MARKET
OUTSIDE OF THE UNITED STATES.  ADSL was developed to transmit digital video over
copper  wire.  Although the  current  infrastructure in  the  local distribution
networks of  telephone  companies is  based  on copper  wire,  there can  be  no
assurance that telephone companies will pursue the deployment of ADSL systems to
allow  the  transmission of  digital  video, data  and  voice or,  if deployment
occurs, as to the volume and  timing of such deployment. Significant  deployment
may  be prevented or delayed by a  number of factors, including cost, regulatory
barriers,  lack  of  programming  content,  lack  of  consumer  demand  and  the
availability  of alternative technologies. Access  systems with high performance
broadband capability, such as the ADSL system, would be attractive to  telephone
companies  only  to  the  extent  that the  telephone  companies  plan  to offer
video-on-demand services which utilize  the full feature  of a high  performance
local  distribution network. Substantial amounts of  time, effort and money will
be required to develop such programming content. There can be no assurance  that
sufficient programming content for video-on-demand services will be developed to
justify  deploying  digital  video  transmission  systems,  or  that programming
content will be  both attractive to  consumers and offered  at prices that  will
create  a mass market. If  such products are developed,  and there is demand for
them, there can be no assurance  that telephone companies will select ADSL  over
competing technologies, such as fiber-to-the-curb, hybrid fiber-coaxial ("HFC"),
and  wireless communications. Fiber-to-the  curb, HFC and  wireless systems have
greater bandwidth than the ADSL products being developed by the Company. Because
foreign telephone companies currently face less competition from cable companies
than telephone companies face  in the United States,  the Company believes  that
its principal markets for ADSL will be outside the United States.

    PRICE  COMPETITIVENESS OF ADSL PRODUCTS.  The Company believes that in order
to  design  and   manufacture  commercially  acceptable   ADSL  products,   cost
improvements  beyond those available with  current technology will be necessary.
The future  success of  the Company  will depend,  in part,  on its  ability  to
develop  ADSL  products  that compete  effectively  on  the basis  of  price and
performance.

                                       4
<PAGE>
Current prices are  significantly higher  than those that  the Company  believes
would  be  necessary for  mass  deployment of  ADSL  products. There  can  be no
assurance that the Company will be  successful in developing ADSL products  that
can be sold at prices low enough to be viable in the market.

    RAPID   TECHNOLOGICAL   CHANGE;   COMPETITION   IN   THE   TELECOMMUNICATION
TRANSMISSION BUSINESS.  Competition  from existing  companies,  including  major
communications  companies,  is  expected  to  increase.  Most  of  the Company's
competitors in the  communications industry are  more established, benefit  from
greater market recognition and have greater financial, technical, production and
marketing  resources than the Company. Some competitors are developing alternate
access technologies, such as HFC,  fiber-to-curb and wireless systems, that  may
prove  technologically  superior  or  more  cost  effective  than  the Company's
technology. There  can be  no assurance  that developments  by others  will  not
render the Company's products or technologies obsolete or noncompetitive or that
the Company will be able to keep pace with new technological developments.

    COMPETITION  IN  THE  PC TO  MAINFRAME  CONNECTIVITY  BUSINESS.   The  PC to
Mainframe Connectivity  market is  highly competitive  and is  characterized  by
rapid  advances in technology which frequently result in the introduction of new
products with  improved  performance  characteristics,  thereby  subjecting  the
Company's  products  to the  risk of  technological obsolescence.  The Company's
ability to  compete  is dependent  on  several factors,  including  reliability,
product  performance, quality, features,  distribution channels, name awareness,
customer support,  product development  capabilities, and  the ability  to  meet
delivery  schedules. The Company  competes directly or  indirectly, with a broad
range of companies, many of whom have significantly greater financial and  other
resources.  In  addition,  the  Company  is only  competing  for  a  limited and
declining segment of the PC-Connectivity  market, which is itself declining  and
expected  to  continue to  decline. The  Company expects  revenues from  its PC-
Connectivity business to continue to decline.

    COMPETITION FOR  VDSL STANDARDS.    The Company  expects  to apply  its  DMT
technology  to  the  development  of Very  High-Speed  Digital  Subscriber Lines
("VDSL") products for the  transmission of digital  video service in  connection
with  a fiber-optic backbone to cover the distance from this platform or node to
subscribers' homes over copper wire or  coaxial cable. ANSI has not yet  awarded
the  standard for VDSL technology, and the competition for the ANSI standard for
VDSL is expected to be  intense. AT&T, as well  as other companies with  greater
resources  than the Company, are expected  to compete for these standards. There
is no  assurance  that  the  Company's DMT  technology  will  be  successful  in
obtaining the ANSI VDSL standard.

    DEPENDENCE  ON  COMPLEMENTARY PRODUCTS.   Widespread  use  of ADSL  and VDSL
products for digital video service will depend on the commercial availability of
other products and  components, including the  video content, digital  switches,
video servers, encode/decode equipment, and set-top boxes in subscribers' homes.
There  can be no  assurance that other  suppliers will develop  and market these
complementary components  effectively or  that these  components, when  combined
with  the Company's ADSL  and VDSL products,  will be a  cost-effective means of
transmitting video-on-demand or video dialtone.

    DEPENDENCE  ON  LARGE  CUSTOMERS  AND  SYSTEMS  INTEGRATORS.    The  Company
typically  expects to sell its  telecommunication transmission products to large
telecommunications service companies which serve as integrators for the  various
component  systems that  make up a  video-on-demand or  multimedia system. These
systems integrators  in  turn  sell  the  systems  to  telephone  companies  for
distribution  to their  subscribers. The Company  is largely  dependent on these
systems integrators for the introduction of its products to field trials.  There
can  be no assurance that systems integrators will select the Company's products
for field trials or,  if they do initially  select the Company's products,  that
they  will continue to use them.  In addition, telephone companies are generally
reluctant to  deploy  new technologies  available  only from  a  single  source,
especially  when the supplier is  as relatively small as  the Company, and often
require  the  availability  of  alternative  sources  before  deploying  a   new
technology.  This reluctance may  put the Company  at a competitive disadvantage
relative to  some  of its  competitors.  Further, acceptance  of  the  Company's
products by these customers may require the

                                       5
<PAGE>
Company  to relinquish  rights to  its technology or  products. There  can be no
assurance, however, that even if the  Company were to relinquish such rights  to
its  technology or products, telephone companies would deploy the Company's ADSL
or VDSL products.

    CUSTOMER CONCENTRATION; RELIANCE ON SALES  TO IBM.  Sales  to IBM for PC  to
Mainframe  connectivity and  related products  accounted for  approximately 83%,
62%, 65% and 70% of the Company's net sales in fiscal 1992, 1993, 1994 and 1995,
respectively. The  Company expects  that  IBM will  continue  to account  for  a
significant  portion of the  Company's future sales  of these products, although
IBM is not obligated to purchase any specified amount of products or to  provide
the  Company with binding  forecasts of product purchases  for any period. There
can be  no  assurance that  IBM  will continue  to  distribute and  support  the
Company's  products.  The  Company's  principal  contract  with  IBM  expires in
December 1996. Further, IBM may terminate  its agreements with the Company  upon
30 days' notice without a significant penalty.

    INTERNATIONAL  BUSINESS.   The  Company expects  that  sales outside  of the
United States  will  represent  a  significant  portion  of  its  future  sales,
especially  of the  Company's ADSL  products. Operations  outside of  the United
States  are  subject   to  various   risks,  including   exposure  to   currency
fluctuations, the imposition of governmental controls, the need to comply with a
wide  variety of foreign  and United States export  laws, political and economic
instability, trade  restrictions,  changes  in tariffs  and  taxes,  and  longer
payment  cycles typically associated with  international sales. The inability of
the Company  to  design  products  to  comply  with  foreign  standards  or  any
significant or prolonged delay in the Company's international sales could have a
material  adverse  effect  on  the  Company's  future  business  and  results of
operations.

    REGULATORY MATTERS.    Telephone  companies, which  constitute  the  initial
primary  market for  the Company's telecommunication  transmission products, and
cable television companies, which may become a future market for such  products,
are subject to extensive regulation by both the federal and state governments in
the United States and by foreign governments. Many of these regulations have the
effect  of limiting the economic incentive  of telephone companies to deploy new
technologies. Restrictions on telephone companies and cable television companies
may materially and  adversely affect  demand for  the products  of the  Company.
Legislation  recently  passed  by  Congress that  will  significantly  alter the
regulations on telephone companies and cable companies in the United States, and
there can be no  assurance that such legislation  will not adversely affect  the
commercialization  of the  Company's products. In  addition, both  in the United
States and abroad, rates for telecommunications services are governed by tariffs
or licensed carriers that are subject to regulatory approval. These tariffs also
could have a material adverse affect on the demand for the Company's products.

    DEPENDENCE  ON  SUPPLIERS  AND  THIRD-PARTY  MANUFACTURERS.    Certain   key
components in the Company's products, such as integrated circuits, are currently
available  only from  single sources.  The Company  does not  have any long-term
supply contracts with its sole source vendors and purchases these components  on
a  purchase order basis.  In addition, certain  components and subassemblies for
the Company's  products  have  long  lead times.  While  the  Company  seeks  to
accurately  forecast its requirements, inaccuracies in its forecast could result
in shortages  or  oversupplies of  these  components. The  inability  to  obtain
sufficient quantities of sole source components or subassemblies as required, or
to  develop alternative  sources as required  in the future,  or inaccuracies in
forecasts for long lead time components or subassemblies could result in  delays
or  reductions in product shipments or  product redesigns which would materially
and adversely affect  the Company's  business, operating  results and  financial
condition.  In addition,  increases in  the prices  of components  for which the
Company does not have  alternate sources could  materially and adversely  affect
the Company's operating results.

    The Company intends to outsource its manufacturing operations to independent
third   party  manufacturers.  There  are  risks  associated  with  the  use  of
independent manufacturers, including  unavailability of or  delays in  obtaining
adequate  supplies of products and reduced  control of manufacturing quality and
production costs.  There can  be no  assurance that  the Company's  third  party

                                       6
<PAGE>
manufacturers  will provide  adequate supplies of  quality products  on a timely
basis. The inability  to obtain such  products on  a timely basis  would have  a
material  adverse  effect  on  the  Company's  business,  operating  results and
financial condition.

    PATENTS AND TRADE SECRETS.  There can be no assurance that any patents owned
or controlled by the Company will provide commercially significant protection of
the Company's technology  or ensure that  the Company may  not be determined  to
infringe  valid patents of others. The Company's patents have not been tested in
court, and the validity and scope  of the Company's proprietary rights could  be
challenged.  The Company has also received foreign patents, but since the patent
laws of foreign countries differ from those of the United States, the degree  of
protection  afforded by any foreign patents may be different from that available
under U.S. patent laws.

    The Company also relies on trade  secrets and proprietary know-how which  it
seeks to protect by confidentiality agreements with its collaborators, employees
and  consultants. There can  be no assurance  that these agreements  will not be
breached, that the Company  will have adequate remedies  for any breach or  that
the  Company's trade secrets and proprietary  know-how will not otherwise become
known or be discovered by competitors.

    THE COMPANY'S RSI LAWSUIT.  The Company is a defendant in a suit brought  in
November 1993 alleging repetitive stress injuries ("RSI") resulting from the use
of the Company's products claiming $1 million in compensatory and $10 million in
punitive damages. While the Company believes that the claim is without merit and
has  tendered defense  of the suit  to its  insurance carriers, there  can be no
assurance that the suit will not have a material adverse effect on the financial
position or results of operations of the Company.

    POSSIBLE VOLATILITY OF STOCK  PRICE; SHARES ELIGIBLE FOR  FUTURE SALE.   The
market  price of  the Company's  Common Stock  has been  and may  continue to be
highly volatile. As a result  of the Merger, the Company  has issued a total  of
5,197,638  additional shares  of Common Stock  to shareholders of  Old Amati and
holders who  exercised their  Old Amati  warrants effective  as of  the  Merger.
1,050,000  of these  shares will be  held in  escrow until November  28, 1996 to
indemnify the Company against damages and expenses arising from a breach of  the
representations,  warranties  and  covenants  of  Old  Amati  contained  in  the
agreements relating to the Merger. Pursuant to the Affiliate's Agreements,  each
Holder  (other than Dr.  Cioffi) has agreed not  to dispose of  more than 25% of
such Holder's  Common  Stock  before  November  28,  1996  without  the  written
permission  of the Company. Dr. Cioffi's  Affiliate's Agreement provides that he
shall not, without the written permission  of the Company, dispose of more  than
25% of the common stock equivalents held by him (including Common Stock issuable
upon  exercise of his  outstanding stock options) before  November 28, 1996, nor
more than 50%  of such  common stock equivalents  before November  28, 1997.  In
addition,  sales of  shares by certain  Selling Stockholders are  subject to the
volume limitation  of Rule  144.  See "Plan  of  Distribution." Except  for  the
foregoing,  the shares  of Common  Stock issued  as a  result of  the Merger are
freely tradeable. Sales of Shares by the Selling Stockholders and sales of other
Common Stock by  other shareholders  of Old Amati,  other current  stockholders,
many  of  whom acquired  their  shares at  prices  significantly lower  than the
current market price,  and by option  holders and warrant  holders who  exercise
Company  stock options or warrants could have  a depressive effect on the market
price of the Company's Common Stock. Additionally, future events, many of  which
will  be  beyond the  control  of the  Company,  as well  as  expected quarterly
fluctuations in revenues and financial results, may have a significant impact on
the market price of the Company's Common Stock.

                                USE OF PROCEEDS

    The Company will not receive any of the proceeds from the sale of the Shares
by the Selling Stockholders.

                                       7
<PAGE>
                              SELLING STOCKHOLDERS

    The following  table sets  forth  certain information  regarding  beneficial
ownership  of  the Company's  Common  Stock by  the  Selling Stockholders  as of
February 29, 1996, including the number of shares underlying stock options  that
are exercisable within 60 days of such date, and as adjusted to reflect the sale
by Selling Stockholders of Shares offered by them by this Prospectus.

<TABLE>
<CAPTION>
                                                            COMMON STOCK                               COMMON STOCK
                                                         BENEFICIALLY OWNED                         BENEFICIALLY OWNED
                                                       PRIOR TO OFFERING (1)                          AFTER OFFERING
                                                    ----------------------------   COMMON STOCK   ----------------------
                                                        NUMBER         PERCENT      TO BE SOLD     NUMBER      PERCENT
                                                    ---------------  -----------  --------------  ---------  -----------
<S>                                                 <C>              <C>          <C>             <C>        <C>
John M. Cioffi (2)................................     1,636,110(4)       9.21%        934,920      701,190       3.59%
James F. Gibbons (3)..............................       333,119(5)       1.94         239,627       93,492          *
Kim Maxwell.......................................       765,465          4.48         765,465            0          0
Nepenthe Group Profit Sharing Plan (FOB) Gerald A.
 Marxman..........................................       179,037          1.05         179,037            0          0
Nepenthe Group Profit Sharing Plan (FOB) Frank J.
 Kocsis...........................................        71,871             *          71,871            0          0
Nepenthe Group Profit Money Purchase Plan (FOB)
 Frank J. Kocsis..................................        59,951             *          59,951            0          0
James F. Ottinger.................................       373,968          2.10         373,968            0          0
Stanford University...............................       584,325          3.42         584,325            0          0
University Ventures II............................       408,562(6)       2.38         335,790       72,772          *
</TABLE>

- ------------------------
*   Less than 1%

(1) Applicable  percentage of ownership is based  on 17,064,692 shares of Common
    Stock outstanding as of February 20, 1996.

(2) Dr. Cioffi was  the founder of  Old Amati  and served as  Vice President  of
    Engineering, Chief Technical Officer and a director of Old Amati since 1991.
    Dr.  Cioffi has been  a director and  the Vice President  of Engineering and
    Chief Technical Officer of the Company since the Merger.

(3) Dr. Gibbons served as the  Chairman of the Board  of Directors of Old  Amati
    since  1992. He  has been  a director  of the  Company since  the Merger and
    Chairman of the Board of Directors since December, 1995. Dr. Gibbons  serves
    as a member of the Compensation Committee.

(4) Includes 701,190 shares issuable upon exercise of outstanding options.

(5) Includes 93,492 shares issuable upon exercise of outstanding options.

(6) Includes 72,772 shares issuable upon exercise of an outstanding warrant.

                              PLAN OF DISTRIBUTION

    All or a portion of the Shares of Common Stock offered hereby by the Selling
Stockholders  may be delivered and/or sold in  transactions from time to time on
the over-the-counter market at prices prevailing at the time, at prices  related
to  such prevailing prices  or at negotiated  prices and/or may  also be used to
cover any short positions previously  established. The Selling Stockholders  may
effect  such transactions by  selling to or through  one or more broker-dealers,
and such broker-dealers  may receive  compensation in the  form of  underwriting
discounts, concessions or commissions from the Selling Stockholders. The Selling
Stockholders  and any  broker-dealers that  participate in  the distribution may
under certain circumstances be deemed to be "underwriters" within the meaning of
the Securities Act, and any commissions received by such broker-dealers and  any
profits  realized  on  the  resale  of  Shares  by  them  may  be  deemed  to be
underwriting discounts and  commissions under  the Securities  Act. The  Selling
Stockholders   may  agree  to  indemnify  such  broker-dealers  against  certain
liabilities, including liabilities  under the Securities  Act. In addition,  the
Company has agreed to

                                       8
<PAGE>
indemnify  the Selling  Stockholders with respect  to the  Shares offered hereby
against certain liabilities, including, without limitation, certain  liabilities
under  the Securities Act,  or, if such indemnity  is unavailable, to contribute
toward amounts required to be paid in respect of such liabilities.

    Any broker-dealer participating  in such transactions  as agent may  receive
commissions  from the Selling  Stockholders (and, if  they act as  agent for the
purchaser of such Shares,  from such purchaser).  Broker-dealers may agree  with
the  Selling Stockholders to sell  a specified number of  Shares at a stipulated
price per share,  and, to the  extent such a  broker-dealer is unable  to do  so
acting  as  agent for  the Selling  Stockholders, to  purchase as  principal any
unsold Shares at the price required  to fulfill the broker-dealer commitment  to
the  Selling Stockholders.  Broker-dealers who  acquire Shares  as principal may
thereafter resell  such Shares  from time  to time  in transactions  (which  may
involve  crosses  and block  transactions  and which  may  involve sales  to and
through other  broker-dealers, including  transactions of  the nature  described
above)  in the over-the-counter market,  in negotiated transactions or otherwise
at market prices prevailing at the time of sale or at negotiated prices, and  in
connection  with such resales may pay to  or receive from the purchasers of such
Shares commissions computed as described above. To the extent required under the
Securities Act, a supplemental prospectus will be filed, disclosing (a) the name
of any such broker-dealers, (b) the number of Shares involved, (c) the price  at
which  such Shares  are to  be sold,  (d) the  commissions paid  or discounts or
concessions allowed  to such  broker-dealers, where  applicable, (e)  that  such
broker-dealers  did not conduct any investigation  to verify the information set
out or incorporated by  reference in this prospectus,  as supplemented, and  (f)
other facts material to the transaction.

    The Selling Stockholders will pay all commissions, transfer taxes, and other
expenses  associated with  the sale  of securities  by them.  The Shares offered
hereby are being registered pursuant to contractual obligations of the  Company,
and the Company has paid the expenses of the preparation of this Prospectus.

    The  Selling Stockholders' rights to offer or sell the Shares are restricted
by  the  Affiliate's  Agreements  and  the  Registration  Rights  Agreement.  In
addition,  sales of shares by Drs. Gibbons  and Cioffi are subject to the volume
limitations and manner-of-sale requirements of Rule 144.

    The Affiliate's Agreements provide that each Holder (other than Dr.  Cioffi)
shall  not, without  the written  permission of  the Company,  sell or otherwise
dispose of more  than 25% of  such Common  Stock before November  28, 1996.  Dr.
Cioffi's  Affiliate's Agreement provides that he  shall not, without the written
permission of the Company,  sell or otherwise  dispose of more  than 25% of  the
common  stock  equivalents held  by him  (including  Common Stock  issuable upon
exercise of his outstanding  stock options) before November  28, 1996, nor  more
than 50% of such common stock equivalents before November 28, 1997.

    Pursuant to the Registration Rights Agreement, the Selling Stockholders have
agreed  that, throughout the period of the Registration Statement, of which this
Prospectus forms a part,  Selling Stockholders shall only  offer or sell  Shares
during  open  Window  Periods  and  in  accordance  with  the  trading clearance
procedure set forth in the Registration Rights Agreement. The trading  clearance
procedure  requires  that,  during  any  Window  Period,  a  Selling Stockholder
proposing to offer or sell pursuant to the Registration Statement, of which this
Prospectus forms a part, must send a clearance form to the Company at least  two
(2)  business days prior  to the date  the Selling Stockholder  proposes to sell
Shares, requesting that the Company clear the trade. The Company shall reply  to
such  Selling Stockholder within two (2)  business days following receipt of the
clearance form, and  in the reply  shall either confirm  that the Window  Period
remains  open and that the  sale can be made,  or notify the Selling Stockholder
that trading is  suspended (and  indicating, if practicable,  the expected  date
when  such suspension shall end).  If the reply confirms  an open Window Period,
the Selling Stockholder is permitted to offer and sell Shares during the  Window
Period,  unless  the Company  informs the  Selling  Stockholder that  the Window
Period has  been  closed.  Clearance  must  be  obtained  each  time  a  Selling
Shareholder intends to offer or sell Shares.

                                       9
<PAGE>
    The Company has the right at any time not to open a Window Period or, during
an  open Window Period, to suspend offers  and sales of Shares whenever, and for
so long as,  in the reasonable  judgment of the  Company there is  or may be  in
existence  material  undisclosed  information  or  events  with  respect  to the
Company.

                          DESCRIPTION OF CAPITAL STOCK

    As of  the date  of this  Prospectus, the  authorized capital  stock of  the
Company  consists of 45,000,000 shares of  Common Stock, $.20 par value ("Common
Stock"), and  5,000  shares  of  Preferred Stock,  $100  par  value  ("Preferred
Stock").

COMMON STOCK

    As  of  February 29,  1996,  there were  17,064,692  shares of  Common Stock
outstanding held of record by  approximately 1,704 stockholders. The holders  of
shares  of Common Stock are entitled to one  vote per share on all matters to be
voted on by stockholders,  except that holders may  cumulate their votes in  the
election  of directors.  Subject to  preferences that  may be  applicable to any
outstanding Preferred Stock,  holders of  Common Stock are  entitled to  receive
ratably  such dividends  as may  be declared  by the  Board of  Directors in its
discretion from funds legally available therefor. In the event of a liquidation,
dissolution, or winding up of the Company, holders of Common Stock are  entitled
to  share ratably in all  assets remaining after payment  of liabilities and the
liquidation preference of  any outstanding  Preferred Stock.  Holders of  Common
Stock have no preemptive rights and have no rights to convert their Common Stock
into any other securities. The outstanding shares of Common Stock are fully paid
and nonassessable.

PREFERRED STOCK

    The  Board of  Directors has the  authority to  issue up to  5,000 shares of
Preferred Stock  in one  or more  series  and to  fix the  rights,  preferences,
privileges  and  restrictions  thereof,  including  dividend  rights, conversion
rights, voting  rights, terms  of redemption,  liquidation preferences  and  the
number  of shares  constituting any  series or  the designation  of such series,
without any  further  vote  or  action by  the  shareholders.  The  issuance  of
Preferred  Stock  may have  the effect  of delaying,  deferring or  preventing a
change in control of the Company or making removal of management more  difficult
without further action by the shareholders and could adversely affect the rights
and  powers, including voting rights, of the holders of Common Stock. This could
have the effect of decreasing the market price of the Common Stock. The  Company
has no present plans to issue any additional shares of Preferred Stock.

                                 LEGAL MATTERS

    The legality of the issuance of the securities being offered hereby is being
passed  upon for  the Company  by Heller  Ehrman White  & McAuliffe,  Palo Alto,
California.

                                    EXPERTS

    The audited financial statements  and schedules of the  Company at July  31,
1993,  July 30, 1994 and  July 29, 1995 and  for each of the  three years in the
period ended July 29, 1995 incorporated  by reference herein and in the  related
Registration  Statement have  been audited  by Arthur  Andersen LLP, independent
public accountants, as indicated in their reports with respect thereto, and  are
incorporated  by reference herein in reliance upon the authority of said firm as
experts.

    The financial statements of Old Amati at December 31, 1993 and 1994 and  for
the  three years  ended in  the period ended  December 31,  1994 incorporated by
reference herein and in the Registration Statement have been audited by Ernst  &
Young  LLP, independent auditors, and are  included in reliance upon such report
given upon the authority of such firm as experts in accounting and auditing.

                                       10
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

    The  following table sets forth various expenses in connection with the sale
and distribution of the  securities being registered. All  of the amounts  shown
are  estimates except  for the  Securities and  Exchange Commission Registration
Fee.

<TABLE>
<S>                                                                 <C>
Securities and Exchange Commission Registration Fee...............  $   6,724
Accounting Fees...................................................      1,000
Printing Costs, Legal Fees and Disbursements......................     20,000
Miscellaneous.....................................................        276
                                                                    ---------
    TOTAL:........................................................  $  28,000
                                                                    ---------
                                                                    ---------
</TABLE>

ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

    The Company has the  power to indemnify its  officers and directors  against
liability  for certain acts  pursuant to Section 145  of the General Corporation
Law of the State of Delaware.  The Restated Certificate of Incorporation of  the
Company provides that a director of the Company, to the full extent permitted by
the  Delaware General Corporation Law, shall not be liable to the Company or its
stockholders for monetary damage for breach of fiduciary duty as a director.

    Article IX  of the  Company's  Bylaws provides  for the  indemnification  of
officers,  directors, employees  and agents of  the Company.  The Bylaws provide
that the Company shall indemnify  its directors, officers, employees and  agents
against  expenses, judgments, fines and amounts  paid in settlement actually and
reasonably incurred  by them  in  connection with  any threatened,  pending,  or
completed action, suit or proceeding (other than an action by or in the right of
the  corporation), if they acted  in good faith and  in a manner they reasonably
believe to be in or not opposed to the best interest of the corporation and  had
no  reasonable  cause to  believe the  conduct  was unlawful.  In relation  to a
proceeding by or in the right of  the Company, a director, officer, employee  or
agent  shall be indemnified against expenses actually and reasonably incurred in
connection with the defense  or settlement of such  proceeding if the  director,
officer,  employee  or agent  acted in  good faith  and  in a  manner he  or she
reasonably believed  to be  in  or not  opposed to  the  best interests  of  the
corporation,  except that  no indemnification  shall be  made in  respect of any
claim, issue or matter as  to which such person shall  have been adjudged to  be
liable for negligence or misconduct in the performance of his or her duty to the
corporation  unless and only to  the extent that the  Delaware Court of Chancery
shall determine that such person is fairly and reasonably entitled to indemnity.
The Bylaws also provide that expenses incurred by a director, officer,  employee
or  agent may be advanced by the Company upon receipt of an undertaking by or on
behalf of the director, officer, employee  or agent to repay such amount  unless
it  shall ultimately be determined that he  or she is entitled to be indemnified
by the Company as authorized in the Bylaws.

                                      II-1
<PAGE>
ITEM 16.  EXHIBITS.

<TABLE>
<CAPTION>
  EXHIBIT                                        DESCRIPTION
- -----------  -----------------------------------------------------------------------------------
<C>          <S>
       5     Opinion of Heller Ehrman White & McAuliffe
      10.1   Registration Rights Agreement dated February 15, 1996*
      10.2   Form of Affiliate's Agreement*
      10.3   Affiliate's Agreement of Dr. John M. Cioffi dated November 20, 1995*
      23.1   Consent of Heller Ehrman White & McAuliffe (included in Exhibit 5)
      23.2   Consent of Arthur Andersen LLP*
      23.3   Consent of Ernst & Young LLP*
      24     Power of Attorney (See Page II-4)
</TABLE>

- ------------------------
*Previously filed.

ITEM 17.  UNDERTAKINGS.

    A. The undersigned Company hereby undertakes:

       (1) To file, during any period in which offers or sales are being made, a
           post-effective amendment to this registration statement;

              (i)
               To include any  prospectus required  by section  10(a)(3) of  the
               Securities Act of 1933;

             (ii)
               To  reflect in the  prospectus any facts  or events arising after
               the effective date  of the  Registration Statement  (or the  most
       recent  post-effective amendment  thereof) which, individually  or in the
       aggregate, represent a fundamental change in the information set forth in
       the Registration Statement;

            (iii)
               To include any material information  with respect to the plan  of
               distribution   not  previously  disclosed   in  the  Registration
       Statement or any material change to such information in the  Registration
       Statement;

    Provided,  however,  that paragraphs  (i) and  (ii) shall  not apply  if the
information required  to be  included  in a  post-effective amendment  by  those
paragraphs  is contained in periodic reports filed by the registrant pursuant to
section 13 or  section 15(d) of  the Securities  Exchange Act of  1934 that  are
incorporated by reference in the Registration Statement.

       (2) That,  for  the  purpose  of  determining  any  liability  under  the
           Securities Act of 1933, each  such post-effective amendment shall  be
    deemed to be a new Registration Statement relating to the securities offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.

       (3) To  remove from registration  by means of  a post-effective amendment
           any of the  securities being  registered which remain  unsold at  the
    termination of the offering.

    B. That,  for purposes of determining any liability under the Securities Act
       of 1933,  each  filing of  the  registrant's annual  report  pursuant  to
section  13(a) or  section 15(d)  of the Securities  Exchange Act  of 1934 (and,
where applicable,  each  filing of  an  employee benefit  plan's  annual  report
pursuant  to  Section 15(d)  of the  Securities  Exchange Act  of 1934)  that is
incorporated by reference in the registration statement shall be deemed to be  a
new  registration statement relating to the securities offering therein, and the
offering of such securities at that time shall be deemed to be the initial  bona
fide offering thereof.

    C. Insofar  as indemnification for liabilities  arising under the Securities
       Act of  1933 may  be  permitted to  directors, officers  and  controlling
persons  of the  Registrant pursuant to  the provisions described  under Item 15
above, or otherwise, the Registrant has been advised that in the opinion of  the
Securities  and  Exchange  Commission, such  indemnification  is  against public
policy as expressed

                                      II-2
<PAGE>
in the Act  and is,  therefore, unenforceable.  In the  event that  a claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
Registrant of expenses incurred  or paid by a  director, officer or  controlling
person  of  the Registrant  in the  successful  defense of  any action,  suit or
proceeding) is  asserted against  the Registrant  by such  Director, officer  or
controlling  person  in connection  with  the securities  being  registered, the
Registrant will,  unless in  the opinion  of  its counsel  the matter  has  been
settled  by controlling precedent, submit to a court of appropriate jurisdiction
the question whether  such indemnification  by it  is against  public policy  as
expressed  in the  Act and will  be governed  by the final  adjudication of such
issue.

                                      II-3
<PAGE>
                                   SIGNATURES

    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
certifies that it has  reasonable grounds to  believe that it  meets all of  the
requirements  for filing on  Form S-3 and  has duly caused  this Amendment to be
signed on its behalf by the undersigned, thereunto duly authorized in San  Jose,
State of California, on the 7th day of March, 1996.

                                          AMATI COMMUNICATIONS CORPORATION

                                          By: _________________*________________
                                                    James E. Steenbergen
                                                 DIRECTOR, PRESIDENT, CHIEF
                                                        EXECUTIVE
                                             OFFICER AND CHIEF FINANCIAL OFFICER

                               POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints James E. Steenbergen or Terry Medel, or either of
them,  with the power of substitution, her or  his attorney in fact, to sign any
amendments to this Registration Statement (including post-effective amendments),
and to file the  same, with exhibits thereto  and other documents in  connection
therewith,  with the  Securities and  Exchange Commission,  hereby ratifying and
confirming all  that  each  of  said  attorney-in-fact,  or  his  substitute  or
substitutes, may do or cause to be done by virtue hereof.

    Pursuant   to  the  requirements  of  the   Securities  Act  of  1933,  this
Registration Statement has  been signed below  by the following  persons in  the
capacities and on the dates indicated.

<TABLE>
<C>                                       <S>                                 <C>
                             *            Director, President, Chief
- ---------------------------------------    Executive Officer and Chief        March 7, 1996
          James E. Steenbergen             Financial Officer
                  /s/ TERRY MEDEL         Chief Accounting Officer
- ---------------------------------------    (Principal Accounting Officer)     March 7, 1996
              Terry Medel

                             *
- ---------------------------------------   Director                            March 7, 1996
             John M. Cioffi

                             *
- ---------------------------------------   Director                            March 7, 1996
            James F. Gibbons

                             *
- ---------------------------------------   Director                            March 7, 1996
              Aamer Latif

                             *
- ---------------------------------------   Director                            March 7, 1996
            Donald L. Lucas

            /s/ TERRY MEDEL
- ---------------------------------------                                       March 7, 1996
              *Terry Medel
           (Attorney-in-fact)
</TABLE>

                                      II-4
<PAGE>
                        AMATI COMMUNICATIONS CORPORATION

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
                                                                                                    SEQUENTIALLY NUMBERED
  EXHIBIT                                         DESCRIPTION                                               PAGES
- -----------  -------------------------------------------------------------------------------------  ---------------------
<C>          <S>                                                                                    <C>
       5     Opinion of Heller Ehrman White & McAuliffe...........................................
      10.1   Registration Rights Agreement dated February 15, 1996*...............................
      10.2   Form of Affiliate's Agreement*.......................................................
      10.3   Affiliate's Agreement of Dr. John M. Cioffi dated November 20, 1995*.................
      23.1   Consent of Heller Ehrman White & McAuliffe (included in Exhibit 5)...................
      23.2   Consent of Arthur Andersen LLP*......................................................
      23.3   Consent of Ernst & Young LLP*........................................................
      24     Power of Attorney (See Page II-4)....................................................
</TABLE>

- ------------------------
*Previously filed.

<PAGE>
                                                                       EXHIBIT 5
                  [HELLER EHRMAN WHITE & McAULIFFE LETTERHEAD]

                                 March 7, 1996

                                                                      16199-0012

Amati Communications Corporation
3801 Zanker Road
San Jose CA 95150

            Registration Statement on Form S-3

Ladies and Gentlemen:

    We  have acted  as counsel to  Amati Communications  Corporation, a Delaware
corporation (the "Company"),  in connection with  the Registration Statement  on
Form  S-3 (Registration No.  33-01187) originally filed  with the Securities and
Exchange Commission (the "Commission")  on February 23, 1996  and as amended  by
Amendment   No.  1  thereto   filed  with  the  Commission   on  March  7,  1996
(collectively, the  "Registration Statement")  for  the purpose  of  registering
under  the  Securities  Act  of  1933, as  amended,  an  aggregate  of 3,544,954
currently issued and outstanding shares of its Common Stock, $.20 par value (the
"Shares"), all of which are to be sold by certain of the Company's stockholders.

                                       I.

    We have assumed the authenticity  of all records, documents and  instruments
submitted  to  us as  originals, the  genuineness of  all signatures,  the legal
capacity of natural persons and the conformity to the originals of all  records,
documents  and instruments submitted to us  as copies. In rendering our opinion,
we have examined the following records, documents, instruments, certificates and
each additional instruments, corporate records, certificates and other documents
as we have deemed necessary or appropriate for our opinion:

    (a)The  Certificate  of  Incorporation  of  the  Company  certified  by  the
       Secretary  of State of the State of Delaware as of February 28, 1996, and
       certified to us by  an officer of  the Company as  being complete and  in
       full force and effect as of the date of this opinion;

    (b)The Bylaws of the Company certified to us by an officer of the Company as
       being  complete  and in  full force  and effect  as of  the date  of this
       opinion;

    (c)A Certificate  of  the  Secretary  and  Treasurer  of  the  Company:  (i)
       attaching  records  certified  to  us  as  constituting  all  records  of
       proceedings and actions of the Board of Directors of the Company relating
       to the Shares; and (ii) certifying as to certain factual matters; and

    (d)The Registration Statement.

    This opinion is  limited to  the laws  of the  State of  California, and  we
disclaim  any  opinion as  to the  laws  of any  other jurisdiction.  We further
disclaim any opinion as to any other statute, rule, regulation, ordinance, order
or other  promulgation  of any  other  jurisdiction  or any  regional  or  local
governmental  body or as to any  related judicial or administrative opinion. Our
opinion to the effect that all issued and outstanding Shares are fully paid  and
nonassessable  is based solely  on the certificate identified  in item (c) above
that the  consideration for  such  Shares recited  in  the Board  of  Directors'
resolutions for such Shares has been received.
<PAGE>
                                      II.

    Based  upon the foregoing and our examination of such questions of law as we
have deemed  necessary or  appropriate  for the  purpose  of this  opinion,  and
assuming  that:  (i) the  Registration Statement  becomes and  remains effective
during the period when the Shares are offered and sold; and (ii) all  applicable
securities  laws are complied with, it is our opinion that the Shares covered by
the Registration Statement are legally issued, fully paid and nonassessable.

                                      III.

    This opinion  is  rendered  to  you  in  connection  with  the  Registration
Statement and is solely for your benefit. This opinion may not be relied upon by
you for any other purpose, or relied upon by any other person, firm, corporation
or  other entity for any purpose, without our prior written consent. We disclaim
any obligation to  advise you  of any developments  that come  to our  attention
after the date of this opinion.

    We  hereby  consent to  the  filing of  this opinion  as  an exhibit  to the
Registration Statement.

                                          Very truly yours,
                                          Heller Ehrman White & McAuliffe


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