<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             OCT-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                         262,648
<SECURITIES>                                   392,906
<RECEIVABLES>                                   82,068
<ALLOWANCES>                                     1,711
<INVENTORY>                                     48,600
<CURRENT-ASSETS>                               893,185
<PP&E>                                         284,108
<DEPRECIATION>                                  98,557
<TOTAL-ASSETS>                               1,132,385
<CURRENT-LIABILITIES>                          115,723
<BONDS>                                        230,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           108
<OTHER-SE>                                     786,554
<TOTAL-LIABILITY-AND-EQUITY>                 1,132,385
<SALES>                                        183,872
<TOTAL-REVENUES>                               183,872
<CGS>                                           74,719
<TOTAL-COSTS>                                   74,719
<OTHER-EXPENSES>                                78,680
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,992
<INCOME-PRETAX>                                 35,397
<INCOME-TAX>                                    10,385
<INCOME-CONTINUING>                             25,012
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    25,012
<EPS-BASIC>                                       0.23
<EPS-DILUTED>                                     0.23