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SN74LVC540AQPWRQ1 SN74LVC540DBLE SN74LVC540DW SN74LVC540FPT SN74LVC541A SN74LVC541ADB SN74LVC541ADBLE SN74LVC541ADBR SN74LVC541ADBRG4 SN74LVC541ADGVR