TC74VHC273 TC74VHC273F TC74VHC273F(EL TC74VHC273F(EL,F) TC74VHC273F(EL,K,F TC74VHC273F(EL,K,F) TC74VHC273F(ELKF TC74VHC273F(K,F) TC74VHC273F(K.F) TC74VHC273FEL