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74F151A Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F151A Datasheet(HTML) 2 Page - Fairchild Semiconductor |
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2 / 7 page  www.fairchildsemi.com 2 Functional Description The F151A is a logic implementation of a single pole, 8- position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both assertion and negation outputs are provided. The Enable input (E) is active LOW. When it is not activated, the negation output is HIGH and the assertion output is LOW regardless of all other inputs. The logic function provided at the output is: Z = E • (I 0 S2 S1 S0 + I1 S2 S1 S0 + I2 S2 S1 S0 + I3 S2 S1 S0 + I4 S2 S1 S0 + I5 S2 S1 S0 + I6 S2 S1 S0 + I7 S2 S1 S0) The F151A provides the ability, in one package, to select from eight sources of data or control information. By proper manipulation of the inputs, the F151A can provide any logic function of four variables and its negation. Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 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. Inputs Outputs E S2 S1 S0 Z Z H XXX H L L LLL I0 I0 LL L H I1 I1 LL H L I2 I2 LL H H I3 I3 LH L L I4 I4 LH L H I5 I5 LH H L I6 I6 LH H H I7 I7 |
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