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74AC157SJX Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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74AC157SJX Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 9 page www.fairchildsemi.com 2 Functional Description The AC/ACT157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active- LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The AC/ACT157 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. The logic equations for the outputs are shown below: Za = E • (I1a • S + I0a • S) Zb = E • (I1b • S + I0b • S) Zc = E • (I1c • S + I0c • S) Zd = E • (I1d • S + I0d • S) A common use of the AC/ACT157 is the moving of data from two groups of registers to four common output bus- ses. The particular 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 AC/ACT157 can gener- ate any four of the sixteen different functions of two vari- ables with one variable common. This is useful for implementing gating functions. 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 SI0 I1 Z HX X X L LH X L L LH X H H LL L X L LL H X H |
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