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    Part Img DSA002621.pdf by Texas Instruments

    • SN54LS640 THRU SN54LS642, SN54LS644, SN54LS645 SN74LS640 THRU SN74LS642, SN74LS644, SN74LS645 OCTAL BUS TRANSCEIVRS SDLS189 ­ APRIL 1979 ­ REVISED MARCH 1988 Copyright © 1988, Texas Instruments
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