74F153SC datasheet(2/10 Pages) NSC

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Unit LoadingFan Out

54F74F

Pin Names

Description

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

Side A Enable Input (Active LOW)

1010

20 mA b06 mA

Side B Enable Input (Active LOW)

1010

20 mA b06 mA

Side A Output

50333

1 mA20 mA

Side B Output

50333

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

H e HIGH Voltage Level

L e LOW

X e Immaterial

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