Exhibit 24

                               POWER OF ATTORNEY

     The undersigned, as a Section 16 reporting person of Rambus Inc. (the
"Company"), hereby constitutes and appoints Jae Kim, Kirk Williams and Keith
Jones, and each of them, as the undersigned's true and lawful attorney-in-fact
to:

     1.  complete and execute Forms 3, 4 and 5 and other forms and all
         amendments thereto as such attorney-in-fact shall in his discretion
         determine to be required or advisable pursuant to Section 16 of the
         Securities Exchange Act of 1934 (as amended) and the rules and
         regulations promulgated thereunder, or any successor laws and
         regulations, as a consequence of the undersigned's ownership,
         acquisition or disposition of securities of the Company; and

     2.  do all acts necessary in order to file such forms with the SEC, any
         securities exchange or national association, the Company and such other
         person or agency as the attorneys-in-fact shall deem appropriate.

     The undersigned hereby ratifies and confirms all that said attorneys-in-
fact and agents shall do or cause to be done by virtue hereof.  The undersigned
acknowledges that the foregoing attorneys-in-fact, in serving in such capacity
at the request of the undersigned, are not assuming, nor is the Company
assuming, any of the undersigned's responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934, as amended.

     This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
Company and the foregoing attorneys-in-fact.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of the date written below.


                                            Signature: /s/ Luc Seraphin
                                                       -------------------------

                                            Print Name: Luc Seraphin
                                                        ------------------------

                                            Date: July 2, 2018
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