The SN54/74LS490 contains a pair of high-speed 4-stage ripple counters. Each half of the SN54/74LS490 has individual Clock, Master Reset and Master Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code.

• Dual Version of SN54/74LS490
• Individual Asynchronous Clear and Preset to 9 for Each Counter
• Count Frequency — Typically 65 MHz
• Input Clamp Diodes Limit High-Speed Termination Effects