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74LVQ157 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74LVQ157 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page 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 Functional Description The LVQ157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Se- lect 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 LVQ157 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: 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 LVQ157 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 func- tion generator. The LVQ157 can generate any four of the six- teen different functions of two variables with one variable common. This is useful for implementing gating functions. Logic Diagram DS011352-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 |
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