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54ACT158F Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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54ACT158F Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Functional Description The ’AC/’ACT158 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 ’AC/’ACT158 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 ’AC/’ACT158 is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is deter- mined by the state of the Select input. A less obvious use is as a function generator. The ’AC/’ACT158 can generate four functions of two variables with one variable common. This is useful for implementing gating functions. Truth Table Inputs Outputs E SI 0 I 1 Z HX X X H LL L X H LL H X L LH X L H LH X H L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram DS100273-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 |
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