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74F521SJ Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F521SJ Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page www.fairchildsemi.com 2 Unit Loading/Fan Out Truth Table H = HIGH Voltage Level L = LOW Voltage Level Note 1: A0 = B0, A1 = B1, A2 = B2, etc. Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL A0–A7 Word A Inputs 1.0/1.0 20 µA/−0.6 mA B0–B7 Word B Inputs 1.0/1.0 20 µA/−0.6 mA IA=B Expansion or Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA OA=B Identity Output (Active LOW) 50/33.3 −1 mA/20 mA Inputs Output IA = B A, B OA = B LA = B (Note 1) L LA ≠ BH HA = B (Note 1) H HA ≠ BH |
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