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74F153SC Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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74F153SC Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 10 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL I0a–I3a Side A Data Inputs 1010 20 mA b06 mA I0b–I3b Side B Data Inputs 1010 20 mA b06 mA S0 S1 Common Select Inputs 1010 20 mA b06 mA Ea Side A Enable Input (Active LOW) 1010 20 mA b06 mA Eb Side B Enable Input (Active LOW) 1010 20 mA b06 mA Za Side A Output 50333 b 1 mA20 mA Zb Side B Output 50333 b 1 mA20 mA Functional Description The ’F153 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 multiplexer 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 ’F153 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 two Select inputs The logic equations for the outputs are as follows Za e Ea(I0aS1S0 a I1aS1S0 a I2aS1S0 a I3aS1S0) Zb e Eb(I0bS1S0 a I1bS1S0 a I2bS1S0 a I3bS1S0) The ’F153 can be used to move data from a group of regis- ters to a common output bus The particular register from which the data came would be determined by the state of the Select inputs A less obvious application is as a function generator The ’F153 can generate two functions of three variables This is useful for implementing highly irregular random logic Truth Table Select Inputs (a or b) Output Inputs S0 S1 E I0 I1 I2 I3 Z XX H X X X X L LL L L 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 H e HIGH Voltage Level L e LOW X e Immaterial 2 |
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