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74F151ASC bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI) |
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74F151ASC bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL I0–I7 Data Inputs 1010 20 mA b06 mA S0–S2 Select Inputs 1010 20 mA b06 mA E Enable Input (Active LOW) 1010 20 mA b06 mA Z Data Output 50333 b 1 mA20 mA Z Inverted Data Output 50333 b 1 mA20 mA Functional Description The ’F151A is a logic implementation of a single pole 8-po- sition switch with the switch position controlled by the state of three Select inputs S0 S1 S2 Both assertion and nega- tion 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 in- puts The logic function provided at the output is Z e E (I0 S2 S1 S0 a I1 S2 S1 S0 a I2 S2 S1 S0 a I3 S2 S1 S0 a I4 S2 S1 S0 a I5 S2 S1 S0 a I6 S2 S1 S0 a 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 Inputs Outputs E S2 S1 S0 Z Z H XXX H L L LLL I0 I0 LL L H I1 I1 L LHL I2 I2 LL H H I3 I3 LH L L I4 I4 L HLH I5 I5 LH H L I6 I6 L HHH I7 I7 H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Logic Diagram TLF9481 – 4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays 2 |
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