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DM74LS90M Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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DM74LS90M Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Function Tables BCD Count Sequence (Note 1) Bi-Quinary (5-2) (Note 2) H = HIGH Level L = LOW Level X = Don’t Care Note 1: Output QA is connected to input B for BCD count. Note 2: Output QD is connected to input A for bi-quinary count. Note 3: Output QA is connected to input B. Logic Diagram The J and K inputs shown without connection are for reference only and are functionally at a high level. Count Output QD QC QB QA 0 L LLL 1L L L H 2L L H L 3L L H H 4L H L L 5L H L H 6L H H L 7 L HHH 8 H LLL 9H L L H Count Output QA QD QC QB 0 L LLL 1L L L H 2L L H L 3L L H H 4L H L L 5 H LLL 6H L L H 7H L H L 8H L H H 9H H L L |
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