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SN74LVC540APWT SN74LVC540APWTE4 SN74LVC540APWTG4 SN74LVC540A-Q1 SN74LVC540AQDWREP SN74LVC540AQDWRQ1 SN74LVC540AQPWREP SN74LVC540AQPWRQ1 SN74LVC540DBLE SN74LVC540DW