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74ACT139 数据表(PDF) 2 Page - Texas Instruments |
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74ACT139 数据表(HTML) 2 Page - Texas Instruments |
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2 / 7 page ![]() 2 Functional Diagram TRUTH TABLE INPUTS OUTPUTS ENABLE SELECT EA1 A0 Y3 Y2 Y1 Y0 L L L HHH L L L HHH L H L H LHLH H L H H L HHH H X X HHHH X = Don’t Care 2 3 1A1 1A0 1E GND = 8 VCC = 16 1Y2 6 7 1Y3 1Y1 5 1Y0 4 1 DECODER 14 13 2A1 2A0 2E 2Y2 10 9 2Y3 2Y1 11 2Y0 12 15 DECODER 1 2 CD74AC139, CD74ACT139 |
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