<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE THREE
MONTHS ENDED JUNE 30, 2000 QUARTERLY REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-2001
<PERIOD-START>                             APR-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                         189,812
<SECURITIES>                                   784,255
<RECEIVABLES>                                   38,960
<ALLOWANCES>                                       689
<INVENTORY>                                     11,092
<CURRENT-ASSETS>                             1,039,967
<PP&E>                                          89,723
<DEPRECIATION>                                  44,810
<TOTAL-ASSETS>                               1,282,107
<CURRENT-LIABILITIES>                           41,747
<BONDS>                                          4,768
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         1,246
<OTHER-SE>                                   1,234,346
<TOTAL-LIABILITY-AND-EQUITY>                 1,282,107
<SALES>                                         74,188
<TOTAL-REVENUES>                                74,188
<CGS>                                           19,314
<TOTAL-COSTS>                                   19,314
<OTHER-EXPENSES>                                49,532
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  43
<INCOME-PRETAX>                                 17,619
<INCOME-TAX>                                    14,224
<INCOME-CONTINUING>                              3,395
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,395
<EPS-BASIC>                                      $0.03
<EPS-DILUTED>                                    $0.03