Exhibit 5.1

Motorola, Inc.
1303 East Algonquin Road
Schaumburg, Illinois  60196

August 15, 2001

Motorola, Inc.
1303 East Algonquin Road
Schaumburg, Illinois  60196

Ladies and Gentlemen:

I refer to the Registration Statement on Form S-4 (the "Registration Statement")
of Motorola, Inc., a Delaware corporation (the "Company"), filed on August 15,
2001 with the Securities and Exchange Commission under the Securities Act of
1933, as amended (the "Securities Act"). The Registration Statement relates to
shares of the Company's Common Stock, par value $3 per share (including the
associated preferred stock purchase rights, the "Shares"), which are to be
issued in connection with the merger (the "Merger") of Bayou Merger Sub, Inc., a
Delaware corporation and a wholly owned subsidiary of the Company ("Merger
Sub"), with and into RiverDelta Networks, Inc., a Delaware corporation
("RiverDelta"), pursuant to the Agreement and Plan of Merger dated as of July
11, 2001 by and among RiverDelta, the Company and Merger Sub, as amended by
Amendment No. 1 thereto dated as of August 13, 2001 (as amended, the "Merger
Agreement").

I have examined and am familiar with (i) the Company's Restated Certificate of
Incorporation, as amended, (ii) the Company's By-Laws, as amended, and (iii) the
corporate proceedings relating to the Merger Agreement and the Registration
Statement. Upon the basis of the foregoing, and having satisfied myself as to
such other matters of law and fact as I consider relevant for the purposes of
this opinion, I advise you that, in my opinion, upon issuance and delivery of
the Shares in accordance with the Merger Agreement, the Shares will have been
validly issued, fully paid and non-assessable.

The foregoing opinion is limited to the General Corporation Law of the State of
Delaware. I express no opinion herein as to any other laws, statutes,
regulations or ordinances.

I hereby consent to the filing of this opinion as an exhibit to the Registration
Statement and to the use of my name in the Registration Statement under the
caption "Legal and Tax Matters." In giving this consent, I do not admit that I
am within the category of persons whose consent is required by Section 7 of the
Securities Act.

                                 Very truly yours,

                                 /s/ Jeffrey A. Brown
                                 ----------------------
                                 By:    Jeffrey A. Brown, Esq.
                                 Title: Senior Corporate Counsel
                                        Corporate Law Department
                                        Motorola, Inc.