54LS192 DM74LS192 Up Down Decade Counter with Sepa.
National Semiconductor
DM74LS192 - Up/Down Decade Counter
54LS192 DM74LS192 Up Down Decade Counter with Separate Up Down Clocks May 1992 54LS192 DM74LS192 Up Down Decade Counter with Separate Up Down Clocks.
