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TYPES SN54LS668, SN54LS669, SN74LS668, SN74LS669 SYNCHRONOUS 4-BIT UP/DOWN COUNTERS
D 2 3 5 1 , APRIL 19 7 7 -R E V IS E D APRIL 1 9 8 5
LS668 . . . SYNCHRONOUS UP/DO W N DECADE COUNTERS 'LS669 .
