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74AC153MTC 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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74AC153MTC 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 9 page www.fairchildsemi.com 2 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 (S0, S1). The two 4-input multi- plexer circuits have individual active-LOW Enables (Ea, Eb) which can be used to strobe the outputs independently. When the Enables (Ea, Eb) are HIGH, the corresponding outputs Za, Zb) are forced LOW. The AC/ACT153 is the logic implementation 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. Za = Ea • (I0a • S1 • S0 + I1a • S1 • S0 + I2a • S1 • S0 + I3a • S1 • S0) Zb = Eb • (I0b • S1 • S0 + I1b • S1 • S0 + I2b • S1 • S0 + I3b • S1 • S0) Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Select Inputs (a or b) Output Inputs S0 S1 E I0 I1 I2 I3 Z XX H XXX X L LL LL X X X L LL L H X X X H HL L X L X X L HL L X H X X H LH L X X L X L LH L X X H X H HH L X X X L L HH L X X X H H |
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