<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          25,264
<SECURITIES>                                     9,018
<RECEIVABLES>                                   26,313
<ALLOWANCES>                                       413
<INVENTORY>                                     12,932
<CURRENT-ASSETS>                                76,712
<PP&E>                                          28,204
<DEPRECIATION>                                  18,934
<TOTAL-ASSETS>                                  97,878
<CURRENT-LIABILITIES>                           27,461
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        60,386
<OTHER-SE>                                      10,031
<TOTAL-LIABILITY-AND-EQUITY>                    97,878
<SALES>                                         45,654
<TOTAL-REVENUES>                                45,654
<CGS>                                           15,690
<TOTAL-COSTS>                                   15,690
<OTHER-EXPENSES>                                24,738
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  6,423
<INCOME-TAX>                                     1,245
<INCOME-CONTINUING>                              4,998
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,998
<EPS-PRIMARY>                                     0.20<F1><F2>
<EPS-DILUTED>                                     0.18<F1><F3>
<FN>
<F1>On August 22, 1997, the Company effected a two-for-one split of its outstanding
shares of Common Stock. This Restated Financial Data Schedule reflects the
stock split.
<F2>Data Listed for "EPS-PRIMARY" is the newly defined "BASIC EPS".
<F3>Data listed for "EPS-DILUTED" is the newly defined "DILUTED EPS".
</FN>