<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM XIRCOM,
INC.'S FORM 10-K FOR THE YEAR ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.

<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-2000
<PERIOD-START>                             OCT-01-1999
<PERIOD-END>                               SEP-30-2000
<CASH>                                         113,284
<SECURITIES>                                   195,205
<RECEIVABLES>                                   62,780
<ALLOWANCES>                                     9,577
<INVENTORY>                                     24,483
<CURRENT-ASSETS>                               412,271
<PP&E>                                         121,290
<DEPRECIATION>                                  46,556
<TOTAL-ASSETS>                                 541,549
<CURRENT-LIABILITIES>                           73,456
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            30
<OTHER-SE>                                     450,929
<TOTAL-LIABILITY-AND-EQUITY>                   541,549
<SALES>                                        496,199
<TOTAL-REVENUES>                               496,199
<CGS>                                          279,318
<TOTAL-COSTS>                                  279,318
<OTHER-EXPENSES>                               185,122
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  97
<INCOME-PRETAX>                                 41,091
<INCOME-TAX>                                    16,063
<INCOME-CONTINUING>                             25,028
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    25,028
<EPS-BASIC>                                        .87
<EPS-DILUTED>                                      .82