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54F158ASCQB 데이터시트(PDF) 2 Page - National Semiconductor (TI) |
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54F158ASCQB 데이터시트(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL I0a–I0d Source 0 Data Inputs 1010 20 mA b06 mA I1a–I1d Source 1 Data Inputs 1010 20 mA b06 mA E Enable Input (Active LOW) 1010 20 mA b06 mA S Select Input 1010 20 mA b06 mA Za–Zd Inverted Outputs 50333 b 1 mA20 mA Functional Description The ’F158A quad 2-input multiplexer selects four bits of data from two sources under the control of a common Se- lect input (S) and presents the data in inverted form at the four outputs The Enable input (E) is active LOW When E is HIGH all of the outputs (Z) are forced HIGH regardless of all other inputs The ’F158A is the logic implementation of a 4-pole 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input A common use of the ’F158A is the moving of data from two groups of registers to four common output busses The par- ticular register from which the data comes is determined by the state of the Select input A less obvious use is as a function generator The ’F158A can generate four functions of two variables with one variable common This is useful for implementing gating functions Truth Table Inputs Outputs E SI0 I1 Z HX X X H LL L X H LL H X L LH X L H LH X H L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Zn e E c (I1n S a I0n S) Logic Diagram TLF9484 – 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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