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    DSA00778633.pdf by Texas Instruments

    • SN54190, SN54191, SN54LS190, SN54LS191, SN74190, SN74191, SN74LS190, SN74LS191 SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL SDLS072 ­ DECEMBER 1972 ­ REVISED MARCH 1988 PRODUCTION DATA i
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