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SN74LVC821APW SN74LVC821APWR SN74LVC821APWR LC821A SN74LVC821APWRE4 SN74LVC821APWRG4 SN74LVC821APWT SN74LVC821DBLE SN74LVC821DBR SN74LVC821DW SN74LVC821PWLE