<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-END>                               MAR-30-1996             JUN-30-1996             SEP-30-1996             DEC-31-1996
<CASH>                                           1,536                   2,064                   3,265                   6,949
<SECURITIES>                                       800                       0                       0                       0
<RECEIVABLES>                                   15,519                  16,072                  17,041                  19,762
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                      9,363                  13,396                  15,660                  13,630
<CURRENT-ASSETS>                                29,963                  34,871                  40,582                  44,572
<PP&E>                                          12,906                  13,467                  14,612                  15,927
<DEPRECIATION>                                   3,160                   3,680                   4,454                   5,046
<TOTAL-ASSETS>                                  39,877                  44,721                  51,274                  57,467
<CURRENT-LIABILITIES>                            8,756                  10,581                  13,076                  14,246
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        12,171                  12,388                  12,714                  13,338
<OTHER-SE>                                           0                       0                       0                       0
<TOTAL-LIABILITY-AND-EQUITY>                    39,877                  44,721                  51,274                  57,467
<SALES>                                         19,618                  44,370                  74,417                 107,437
<TOTAL-REVENUES>                                19,618                  44,370                  74,417                 107,437
<CGS>                                           10,401                  23,163                  39,068                  56,021
<TOTAL-COSTS>                                   10,401                  23,163                  39,068                  56,021
<OTHER-EXPENSES>                                 6,060                  13,693                  22,241                  31,844
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                                  3,227                   7,608                  13,235                  19,755
<INCOME-TAX>                                     1,128                   2,704                   4,599                   6,902
<INCOME-CONTINUING>                              2,099                   4,904                   8,636                  12,853
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     2,099                   4,904                   8,636                  12,853
<EPS-PRIMARY>                                      .19                     .44                     .77                    1.15
<EPS-DILUTED>                                      .18                     .42                     .73                    1.08


</TABLE>