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TYPES SN54LS638, SN54LS639, SN74LS638, SN74LS639 OCTAL BUS TRANSCEIVERS
D 2 6 3 6 , J A N U A R Y 1981 R E V IS E D D E C E M B E R 1983
Bidirectional Bus Transceivers in HighDensity 20-Pin Packag
