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54AC258 Arkusz danych(PDF) 3 Page - Texas Instruments |
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54AC258 Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 10 page Connection Diagrams Functional Description The ’AC/’ACT258 is a quad 2-input multiplexer with TRI-STATE outputs. It selects four bits of data from two sources under control of a common Select input (S). When the Select input is LOW, the I 0x inputs are selected and when Select is HIGH, the I 1x inputs are selected. The data on the selected inputs appears at the outputs in inverted form. The ’AC/’ACT258 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is deter- mined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Z a = OE • (I1a • S+I0a • S) Z b = OE • (I1b • S+I0b • S) Z c = OE • (I1c • S+I0c • S) Z d = OE • (I1d • S+I0d • S) When the Output Enable input (OE) is HIGH, the outputs are forced to a high impedance state. If the outputs of the TRI-STATE devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should en- sure that Output Enable signals to TRI-STATE devices whose outputs are tied together are designed so there is no overlap. Truth Table Output Select Data Outputs Enable Input Inputs OE SI 0 I 1 Z HX X X Z LH X L H LH X H L LL L X H LL H X L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Pin Assignment for DIP and Flatpak DS100287-3 Pin Assignment for LCC DS100287-4 www.national.com 2 |
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