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SN74LS490 - DUAL DECADE COUNTER

Download the SN74LS490 datasheet PDF. This datasheet also covers the SN74LS490D variant, as both devices belong to the same dual decade counter family and are provided as variant models within a single manufacturer datasheet.

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Note: The manufacturer provides a single datasheet file (SN74LS490D_MotorolaInc.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN74LS40 DUAL 4-INPUT NAND BUFFER
SN74LS42 ONE-OF-TEN DECODER
SN74LS47 BCD TO 7-SEGMENT DECODER/DRIVER
SN74LS48 BCD TO 7-SEGMENT DECODER
SN74LS00 QUAD 2-INPUT NAND GATE

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 Going Edge) Counter Outputs (Note b) 0.5 U.L. 0.5 U.L. 1.5 U.L. 10 U.L. 0.25 U.L. 0.25 U.L. 1.5 U.L.