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TC74VHCT540AFT(E,K TC74VHCT540AFT(E.K) TC74VHCT540AFT(EK TC74VHCT540AFT(EL) TC74VHCT540AFT.EL TC74VHCT540AFTEK TC74VHCT540AFTEK(M) TC74VHCT540AFTEL TC74VHCT540F TC74VHCT540FS