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SN54HC640, SN54HC643, SN54HC645 SN74HC640, SN74HC643, SN74HC645 OC TAL BUS TRANSC EIVERS W ITH 3-STATE O U TPU TS
D 26B 4, DECEMBER 1 9 8 2 -R E V IS E D SEPTEMBER 1 9 8 7
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