<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                         403,187
<SECURITIES>                                   278,332
<RECEIVABLES>                                  115,299
<ALLOWANCES>                                     4,155
<INVENTORY>                                     57,148
<CURRENT-ASSETS>                               937,170
<PP&E>                                         292,594
<DEPRECIATION>                                  91,648
<TOTAL-ASSETS>                               1,235,233
<CURRENT-LIABILITIES>                          120,159
<BONDS>                                        230,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           116
<OTHER-SE>                                     867,318
<TOTAL-LIABILITY-AND-EQUITY>                 1,235,233
<SALES>                                        180,630
<TOTAL-REVENUES>                               180,630
<CGS>                                           79,738
<TOTAL-COSTS>                                   79,738
<OTHER-EXPENSES>                               188,157
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               3,067
<INCOME-PRETAX>                               (81,199)
<INCOME-TAX>                                   (3,860)
<INCOME-CONTINUING>                           (77,339)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (77,339)
<EPS-PRIMARY>                                   (0.68)<F1>
<EPS-DILUTED>                                   (0.68)
<FN>
<F1>FOR PURPOSES OF THIS EXHIBIT, PRIMARY MEANS BASIC.
</FN>