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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEET AND CONSOLIDATED STATEMENT OF INCOME AND IS QUALIFIED IN TIS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C> <C>
<PERIOD-TYPE> 3-MOS 3-MOS 12-MOS
<FISCAL-YEAR-END> MAR-31-2001 MAR-31-2000 MAR-31-2000
<PERIOD-START> APR-01-2000 APR-01-1999 APR-01-1999
<PERIOD-END> JUN-30-2000 JUN-30-1999 MAR-31-2000
<CASH> 56722 0 48515
<SECURITIES> 17611 0 21807
<RECEIVABLES> 13323 0 11144
<ALLOWANCES> 719 0 754
<INVENTORY> 4362 0 3131
<CURRENT-ASSETS> 96627 0 90492
<PP&E> 13704 0 12603
<DEPRECIATION> 7653 0 6946
<TOTAL-ASSETS> 103277 0 96748
<CURRENT-LIABILITIES> 17441 0 15626
<BONDS> 0 0 0
0 0 0
0 0 0
<COMMON> 31 0 31
<OTHER-SE> 41834 0 41424
<TOTAL-LIABILITY-AND-EQUITY> 103277 0 96748
<SALES> 17761 12814 0
<TOTAL-REVENUES> 25169 19071 0
<CGS> 6094 4814 0
<TOTAL-COSTS> 6689 5227 0
<OTHER-EXPENSES> 12893 9218 0
<LOSS-PROVISION> 0 0 0
<INTEREST-EXPENSE> 17 1 0
<INCOME-PRETAX> 5587 4626 0
<INCOME-TAX> 2317 1764 0
<INCOME-CONTINUING> 4304 3134 0
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> 0 0 0
<CHANGES> 0 0 0
<NET-INCOME> 4304 3134 0
<EPS-BASIC> .16 .22 0
<EPS-DILUTED> .15 .13 0
</TABLE>
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