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SN54ALS640A THRU SN54ALS645A, SN54AS640 THRU SN54AS645
SN74ALS640A THRU SN74ALS645A, SN74AS640 THRU SN74AS645
OCTAL BUS TRANSCEIVERS
D2661, DECEMBER 1983-RE V ISE D MAY 1986
SN 54ALS', SN 54A S'