SN74ALS644AN SN74ALS645A SN74ALS645A-1 SN74ALS645A-1DBR SN74ALS645A-1DW SN74ALS645A-1DWE4 SN74ALS645A-1DWG4 SN74ALS645A-1DWR SN74ALS645A-1DWRE4 SN74ALS645A-1DWRG4