<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
NOTE: THE SHARES USED IN THE COMPUTATION OF BASIC AND DILUTED NET INCOME PER
SHARE REFLECT THE TWO-FOR-ONE STOCK SPLIT EFFECTED OCTOBER 19, 2000.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 381,486
<SECURITIES> 22,815
<RECEIVABLES> 12,140
<ALLOWANCES> 0
<INVENTORY> 9,490
<CURRENT-ASSETS> 432,735
<PP&E> 27,591
<DEPRECIATION> 0
<TOTAL-ASSETS> 465,351
<CURRENT-LIABILITIES> 18,999
<BONDS> 0
0
0
<COMMON> 358,988
<OTHER-SE> 86,842
<TOTAL-LIABILITY-AND-EQUITY> 465,351
<SALES> 58,841
<TOTAL-REVENUES> 58,841
<CGS> 24,392
<TOTAL-COSTS> 48,680
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 22,874
<INCOME-TAX> 8,464
<INCOME-CONTINUING> 14,410
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 14,410
<EPS-BASIC> 0.38
<EPS-DILUTED> 0.34
</TABLE>