Motorola MC74F158AD, MC74F158AN, MC54F158AJ Datasheet

4-69

FAST AND LS TTL DATA

QUAD 2-INPUT MULTIPLEXER

The MC74F158A is a high-speed quad 2-input multiplexer. It selects four
bits of data from two sources using the common Select and Enable inputs.
The four buffered outputs present the selected data in the inverted form. The
F158A can also generate any four of the 16 different functions of two
variables.

• AC Enhanced Version of the F158

CONNECTION DIAGRAM DIP (TOP VIEW)

1516 14 13 12 11 10

21 3 4 5 6 7

V

CC

9

8

E

I0cI

1c

Z

cI0dI1dZd

S I

0aI1aZaI0bI1bZb

GND

LOGIC DIAGRAM

I

0aI1aI0bI1bI0c

I

1b

I

1cI0d

SEI

1d

Z

a

Z

b

Z

c

Z

d

FUNCTION TABLE

Inputs Output

E S I

0

I

1

Z

H X X X H
L L L X H
L L H X L
L H X L H
L H X H L

H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care

MC74FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXD SOIC

MC74F158A

QUAD 2-INPUT
MULTIPLEXER

FAST SHOTTKY TTL

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

12

13

14

15

1

2
3

4

7

5
6

11
10

9

Z

a

Z

b

Zc

Z

d

I

1a

I

0a

E

I

0c

I

1c

I

1d

I

0d

I

0b

I

1b

VCC = PIN 16
GND = PIN 8

S

4-70

FAST AND LS TTL DATA

MC74F158A

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 74 4.5 5.0 5.5 V

T

A

Operating Ambient Temperature Range 74 0 25 70 °C

I

OH

Output Current — High 74 –1.0 mA

I

OL

Output Current — Low 74 20 mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol Parameter Min Typ Max Unit Test Conditions

V

IH

Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage

V

IL

Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage

V

IK

Input Clamp Diode Voltage –1.2 V IIN = –18 mA VCC = MIN

V

OH

Output HIGH Voltage 74 2.7 3.4 V IOH = –1.0 mA VCC = 4.75 V

74 2.5 VCC = 4.50 V

V

OL

Output LOW Voltage 0.35 0.5 V IOL = 20 mA VCC = MIN

I

IH

Input HIGH Current 20

µA VIN = 2.7 V VCC = MAX

100 µA VIN = 7.0 V

I

IL

Input LOW Current –0.6 mA VIN = 0.5 V VCC = MAX

I

OS

Output Short Circuit Current (Note 2) –60 –150 mA V

OUT

= 0 V VCC = MAX

I

CC

Power Supply Current (Note 3) 10 15 mA VCC = MAX, VIN = HIGH

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.

2. Not more than one output should be shorted at a time, nor for more than 1 second.

3. ICC measured with outputs open and 4.5 V applied to all inputs.

AC CHARACTERISTICS

74F 74F

TA = +25°C

VCC = +5.0 V

CL = 50 pF

TA = 0°C to 70°C

VCC = 5.0 V ±10%

CL = 50 pF

Symbol Parameter Min Max Min Max

Unit

t

PLH

Propagation Delay 3.0 8.5 3.0 9.5

ns

t

PHL

S to Z 2.5 6.5 2.5 7.0

t

PLH

Propagation Delay 2.5 6.0 2.5 7.0

ns

t

PHL

E to Z

n

2.0 6.0 2.0 6.5

t

PLH

Propagation Delay 2.0 5.9 2.0 7.0

ns

t

PHL

In to Z 1.0 4.0 1.0 4.5

FUNCTIONAL DESCRIPTION

The F158A quad 2-input multiplexer selects four bits of data

from two sources under the control of a common Select input
(S) and presents the data in inverted form at the four outputs.
The Enable input (E

) is active LOW. When E is HIGH, all of the

outputs (Z

) are forced HIGH regardless of all other inputs. The
F158A is the logic implementation of a 4-pole, 2-position
switch where the position of the switch is determined by the
logic levels supplied to the Select input.

A common use of the F158A is the moving of data from two
groups of registers to four common output busses. The partic­ular register from which the data comes is determined by the
state of the Select input. A less obvious use is as a function
generator. The F158A can generate four functions of two vari­ables with one variable in common. This is useful for imple­menting gating functions.