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SN74LS490

Part Number	SN74LS490
Manufacturer	Motorola
Description	DUAL DECADE COUNTER
Published	Jan 9, 2017
Detailed Description	DUAL DECADE COUNTER The SN54 / 74LS490 contains a pair of high-speed 4-stage ripple counters. Each half of the SN54 / 74...
Datasheet	SN74LS490 PDF File

Overview

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 CONNECTION DIAGRAM DIP (TOP VIEW) VCC CPb MRb Q0b MSb Q1b Q2b Q3b 16 15 14 13 12 11 10 9 1 2 3 4 56 78 CPa MRa Q0a MSa Q1a Q2a Q3a GND PIN NAMES LOADING (Note a) HIGH LOW MS MR CP Q0 – Q3 Master Set (Set to 9) Input Master Reset Clock Input (Active LOW Go...

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