전자부품 데이터시트 검색엔진 |
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74F379SC 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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74F379SC 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 74F379 consists of four edge-triggered D-type flip- flops with individual D inputs and Q and Q outputs. The Clock (CP) and Enable (E) inputs are common to all flip- flops. When the E is input HIGH, the register will retain the present data independent of the CP input. The Dn and E inputs can change when the clock is in either state, pro- vided that the recommended setup and hold times are observed. Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Transition NC = No Change 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 E Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA D0–D3 Data Inputs 1.0/1.0 20 µA/−0.6 mA CP Clock Pulse Input (Active Rising Edge) 1.0/1.0 20 µA/−0.6 mA Q0–Q3 Flip-Flop Outputs 50/33.3 −1 mA/20 mA Q0–Q3 Complement Outputs 50/33.3 −1 mA/20 mA Inputs Outputs E CP Dn Qn Qn H XNC NC L HH L L LL H |
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