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SN74LVC821ADVR SN74LVC821ADW SN74LVC821ADWE4 SN74LVC821ADWG4 SN74LVC821ADWR SN74LVC821ANSR SN74LVC821ANSRE4 SN74LVC821ANSRG4 SN74LVC821APW SN74LVC821APWR