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SN54LS640 THRU SN54LS642, SN54LS644. SNS4LS645 SN74LS640 THRU SN74LS642, SN74LS644, SN74LS645 OCTAL BUS TRANSCEIVERS
D2420, APRIL 1979-REV1SED MARCH 1988
SN74LS04X-1 Versions Rated at I qj_ of 48