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54AC157L Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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54AC157L Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page 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 com- mon Select input (S). The Enable input (E) is active-LOW. When E is HIGH, all of the outputs (Z) are forced LOW re- gardless of all other inputs. The ’AC/’ACT157 is the logic implementation of a 4-pole, 2-position switch where the posi- tion of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Z a = E • (I1a • S+I0a • S) Z b = E • (I1b • S+I0b • S) Z c = E • (I1c • S+I0c • S) Z d = 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 busses. 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 generate any four of the sixteen different 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 L LH X L L LH X H H LL L X L LL H X H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram DS100272-5 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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