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SN7490A, SN7492A, SN7493A, SN74LS90, SN74LS92, SN74LS93. DECADE, DIVIDE-BY-TWELVE AND BINARY COUNTERS. SDLS940A – MARCH 1974 – REVISED MARCH 1988.

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#44. 7490 Datasheet | National Semiconductor - DatasheetsPDF.com

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#64. 74LS90 IC Decade BCD Counter 7490 - Megatronics.pk

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