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74F148 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F148 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The F148 8-input priority encoder accepts data from eight active LOW inputs (I0–I7) and provides a binary represen- tation on the three active LOW outputs. A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line 7 having the high- est priority. A HIGH on the Enable Input (EI) will force all outputs to the inactive (HIGH) state and allow new data to settle without producing erroneous information at the out- puts.A Group Signal output (GS) and Enable Output (EO) are provided along with the three priority data outputs (A2, A1, A0). GS is active LOW when any input is LOW: this indicates when any input is active. EO is active LOW when all inputs are HIGH. Using the Enable Output along with the Enable Input allows cascading for priority encoding on any number of input signals. Both EO and GS are in the inactive HIGH state when the Enable Input is HIGH. 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. Application 16-Input Priority Encoder Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL I0 Priority Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA I1–I7 Priority Inputs (Active LOW) 1.0/2.0 20 µA/−1.2 mA EI Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA EO Enable Output (Active LOW) 50/33.3 −1 mA/20 mA GS Group Signal Output (Active LOW) 50/33.3 −1 mA/20 mA A0–A2 Address Outputs (Active LOW) 50/33.3 −1 mA/20 mA |
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