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74VHC157 Fiches technique(PDF) 2 Page - Fairchild Semiconductor |
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74VHC157 Fiches technique(HTML) 2 Page - Fairchild Semiconductor |
2 / 10 page ©1992 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC157 Rev. 1.2 2 Logic Symbols IEEE/IEC Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Functional Description The VHC157 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 VHC157 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 VHC157 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 obvi- ous use is as a function generator. The VHC157 can generate any four of the sixteen different functions of two variables with one variable common. This is useful for implementing gating functions. 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 |
Numéro de pièce similaire - 74VHC157 |
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Description similaire - 74VHC157 |
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