资料介绍
74LS168.pdf 54LS168 Synchronous Bi-Directional BCD Decade Counter
June 1989
54LS168 Synchronous Bi-Directional
BCD Decade Counter
General Description
The 54LS168 is a fully synchronous 4-state up down coun-
ter featuring a preset capability for programmable operation
carry lookahead for easy cascading and a U D input to con-
trol the direction of counting It counts in the BCD (8421)
sequence and all state changes whether in counting or par-
allel loading are initiated by the LOW-to-HIGH transition of
the clock
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