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SN74AHC540NSRE4 SN74AHC540NSRG4 SN74AHC540PW SN74AHC540PWE4 SN74AHC540PWG4 SN74AHC540PWR SN74AHC540PWRE4 SN74AHC540PWRG4 SN74AHC540PWR-P SN74AHC541