MM54C192 MM74C192 Synchronous 4-Bit Up Down Decade.
National
MM54C192 - Synchronous 4-Bit Up/Down Decade Counter
MM54C192 MM74C192 Synchronous 4-Bit Up Down Decade Counter MM54C193 MM74C193 Synchronous 4-Bit Up Down Binary Counter February 1988 MM54C192 MM74C19.
