Fairchild 74F153 service manual

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74F153
Dual 4-Input Multiplexer

General Description

The F153 is a high-speed dual 4-input multiplexer with
common select inputs and individual enable inputs for each
section. It can select two lines of data fro m four sources.
The two buffered outputs present data in the true (non­inverted) form. In addition to multiplexer operation, the
F153 can generate any two functions of three variables.

Ordering Code:

Order Number Package Number Package Description

74F153SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74F153SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F153PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

74F153 Dual 4-Input Multiplexer

April 1988
Revised July 1999

Logic Symbols

Connection Diagram

IEEE/IEC

© 1999 Fairchild Semiconductor Corporation DS009482 www.fairchildsemi.com

Unit Loading/Fan Out

74F153

Pin Names Description

I0a–I

3a

I

0b–I3b

, S

S

0

1

E

a

E

b

Z

a

Z

b

U.L.

HIGH/LOW

Input I

Output I

IH/IIL
OH/IOL

Side A Data Inputs 1.0/1.0 20 µA/−0.6 mA
Side B Data Inputs 1.0/1.0 20 µA/−0.6 mA
Common Select Inputs 1.0/1.0 20 µA/−0.6 mA
Side A Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA
Side B Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA
Side A Output 50/33.3 −1 mA/20 mA
Side B Output 50/33.3 −1 mA/20 mA

Truth Table

Select Inputs Inputs (a or b) Output

S1E I0I1I2I

S

0

X X HXXXX L
L L LLXXX L
L L LHXXX H
H L LXLXX L
HLLXHXXH
LHLXXLXL
LHLXXHXH
H H LXXXL L
H H LXXXH H

H = HIGH Voltage Level
L = LOW
X = Immaterial

Logic Diagram

Functional Description

The F153 is a dua l 4- in pu t mu l ti ple x er. It can select tw o bi t s
of data from up to four so urces under the control of the

Z

3

common Select inputs (S
circuits have individual active LOW Enables (E
can be used to strobe the outputs independently. When the

Enables (E

) are forced LOW. The F153 i s the logi c impleme ntation

Z

b

, Eb) are HIGH, the corresponding outputs (Za,

a

of a 2-pole, 4-position switch, where the position of the
switch is determined by the logic levels s upp lied to the two
Select inputs. The logic e quations for the outputs are as
follows:

= Ea•(I0a•S1•S0 + I1a•S1•S0 +

Z

a

= Eb•(I0b•S1•S0 + I1b•S1•S0 +

Z

b

The F153 can be used to mo ve da ta fr om a group of regis­ters to a common output bus. Th e particular reg ister from
which the data came would be det ermined by the state of
the Select inputs. A less obvious app lication is as a func­tion generator. The F153 can generate two functions of
three variables. This is useful for implementing highly irreg­ular random logic.

, S1). The two 4-input multiplexer

0

+ I3a•S1•S0)

I

2a•S1•S0

+ I3b•S1•S0)

I

2b•S1•S0

, Eb) which

a

Please note that this diagram is provided o nly f or t he understanding of lo gic operations and shou ld not be used to estimate propagation delays.

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