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M74HC390 Datasheet(PDF) 5 Page - STMicroelectronics |
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M74HC390 Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 17 page  M74HC390 Truth table 5/17 3 Truth table Table 2. Truth table COUNT Outputs BCD COUNT (1) 1. Output QA is connected to input CLOCK B for BCD count. BI-QUINARY (2) 2. Output QD is connected to input CLOCK A for bi-quinary count. QD QC QB QA QA QD QC QB 0 LLLL LLLL 1 LLL H LLL H 2 L LH L L LH L 3 L LH HL LH H 4L H L L L H L L 5L H L H H H L L 6L H H L H L L H 7 L H HHH L H L 8 H LLL H L H H 9H L L H H H L L Table 3. Truth table Inputs Outputs CLOCK A CLOCK B CLEAR QA QB QC QD X X H LLL L X L BINARY COUNT UP X L QUINARY COUNT UP |
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