SN74ALS640B-1NSR
SN74ALS640B-1NSRE4
SN74ALS640B-1NSRG4
SN74ALS640BDW
SN74ALS640BDWE4
SN74ALS640BDWG4
SN74ALS640BDWR
SN74ALS640BDWRE4
SN74ALS640BDWRG4
SN74ALS640BN