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54AC153 Datasheet(PDF) 3 Page - Texas Instruments |
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54AC153 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 10 page Connection Diagrams Functional Description The ’AC/’ACT153 is a dual 4-input multiplexer. It can select two bits of data from up to four sources under the control of the common Select inputs (S 0,S1). The two 4-input multi- plexer circuits have individual active-LOW Enables (E a,Eb) which can be used to strobe the outputs indepedently. When the Enables (E a,Eb) are HIGH, the corresponding outputs Z a,Zb) are forced LOW. The ’AC/’ACT153 is the logic imple- mentation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels supplied to the Select inputs. The logic equations for the outputs are shown below. Z a = Ea • (I0a • S1 • S0 +I1a • S1 • S0 + I 2a • S1 • S0 +I3a • S1 • S0) Z b = Eb • (I0b • S1 • S0 +I1b • S1 • S0 + I 2b • S1 • S0 +I3b • S1 • S0) Truth Table Select Inputs (a or b) Output Inputs S 0 S 1 E I 0 I 1 I 2 I 3 Z XX H XXXX L L LLL X X X L L L L H XXX H H L L XLX X L H L L XHX X H L H L X XLX L L H L X XHX H H H L XXX L L H H L XXX H H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Pin Assignment for DIP and Flatpak DS100271-3 Pin Assignment for LCC DS100271-4 www.national.com 2 |
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