SN54LS490 Datasheet PDF

SN54/74LS490 DUAL DECADE COUNTER 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.

SN54/74LS490 DUAL DECADE COUNTER 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.