Datasheet SN74ls151 Datasheet

8-INPUT MULTIPLEXER

The TTL/MSI SN54/74LS151 is a high speed 8-input Digital Multiplexer.
It provides, in one package, the ability to select one bit of data from up to eight
sources. The LS151 can be used as a universal function generator to
generate any logic function of four variables. Both assertion and negation
outputs are provided.

• Schottky Process for High Speed

• Multifunction Capability

• On-Chip Select Logic Decoding

• Fully Buffered Complementary Outputs

• Input Clamp Diodes Limit High Speed Termination Effects

CONNECTION DIAGRAM DIP (TOP VIEW)

V

CC

16 15

I4I5I

6I7

14 13 12 11 10 9

S

S

0

S

1

2

SN54/74LS151

8-INPUT MULTIPLEXER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

16

1

16

1

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

123456
I

I2I

3

PIN NAMES LOADING (Note a)

S0–S
E
I0–I

7

Z
Z

NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

T emperature Ranges.

Select Inputs

2

Enable (Active LOW) Input
Multiplexer Inputs
Multiplexer Output (Note b)
Complementary Multiplexer Output

(Note b)

1I0

ZZ

8

7
EGND

HIGH

0.5 U.L.

0.5 U.L.

0.5 U.L.
10 U.L.
10 U.L.

LOW

0.25 U.L.

0.25 U.L.

0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.

D SUFFIX

16

1

SOIC

CASE 751B-03

ORDERING INFORMATION

SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC

LOGIC SYMBOL

7432115141312

EI0I1I2I3I4I5I6I

S

11

10

0

S

1

9

S

2

Z

Z

65

7

FAST AND LS TTL DAT A

5-1

VCC = PIN 16
GND = PIN 8

SN54/74LS151

LOGIC DIAGRAM

9

S

2

10

S

1

11

S

0

7

E

VCC = PIN 16
GND = PIN 8

= PIN NUMBERS

I

0

FUNCTIONAL DESCRIPTION

The LS151 is a logical implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both assertion and
negation outputs are provided. The Enable input (E) is active
LOW. When it is not activated, the negation output is HIGH
and the assertion output is LOW regardless of all other inputs.
The logic function provided at the output is:

I

I

I

I

I

I

1

2

3

4

5

34

6

5

Z Z

Z = E

⋅ (I0 ⋅ S

⋅ S1 ⋅ S2 + ⋅ I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅ S

0

1412

I

6

7

1315

12

+ I3 ⋅ S0 ⋅ S1 ⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅ S1 ⋅ S2 + I6 ⋅ S

⋅ S1 ⋅ S2 + I7 ⋅ S0 ⋅ S1 ⋅ S2).

The LS151 provides the ability, in one package, to select
from eight sources of data or control information. By proper
manipulation of the inputs, the LS151 can provide any logic
function of four variables and its negation.

2
0

TRUTH TABLE

E S2S1S0I0I1I2I3I4I5I6I7Z Z

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

L L LLLXXXXXXXHL
LLLLHXXXXXXXLH
LLLHXLXXXXXXHL
LLLHXHXXXXXXLH
LLHLXXLXXXXXHL
LLHLXXHXXXXXLH
LLHHXXXLXXXXHL
LLHHXXXHXXXXLH
LHLLXXXXLXXXHL
LHLLXXXXHXXXLH
LHLHXXXXXLXXHL
LHLHXXXXXHXXLH
LHHLXXXXXXLXHL
LHHLXXXXXXHXLH
LHHHXXXXXXXLHL
LHHHXXXXXXXHLH

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

FAST AND LS TTL DATA

5-2

SN54/74LS151

VILI

LOW Volt

V

Guaranteed Input LOW Voltage for
VOHOutput HIGH Volt

VCC MIN, IOH MAX, VIN V

IH

VOLOutput LOW Volt

V

V

V

IIHI

HIGH C

t

VCC 5.0 V

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

T

A

I

OH

I

OL

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Symbol Parameter

V

IH

V

IK

I

IL

I

OS

I

CC

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

AC CHARACTERISTICS (T

Symbol Parameter

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

Supply Voltage 54

Operating Ambient Temperature Range 54

Output Current — High 54, 74 –0.4 mA
Output Current — Low 54

Limits

Min Typ Max

Input HIGH Voltage 2.0 V

nput

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA

nput

Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
Power Supply Current 10 mA VCC = MAX

Propagation Delay
Select to Output Z

Propagation Delay
Select to Output Z

Propagation Delay
Enable to Output Z

Propagation Delay
Enable to Output Z

Propagation Delay
Data to Output Z

Propagation Delay
Data to Output Z

age

age

age

urren

= 25°C)

A

54 0.7
74 0.8

54 2.5 3.5 V
74 2.7 3.5 V

54, 74 0.25 0.4 V IOL = 4.0 mA

74 0.35 0.5 V IOL = 8.0 mA

Limits

Min Typ Max

27
18

14
20

26
20

15
18

20
16

13
12

74

74

74

20 µA VCC = MAX, VIN = 2.7 V

0.1 mA VCC = MAX, VIN = 7.0 V

43
30

23
32

42
32

24
30

32
26

21
20

4.5

4.75
–55

0

Unit Test Conditions

Guaranteed Input HIGH Voltage for
All Inputs

Guaranteed Input LOW Voltage for
All Inputs

VCC = MIN, IOH = MAX, VIN = V
or VIL per Truth Table

Unit Test Conditions

ns

ns

ns

ns

ns

ns

5.0

5.0
25

25

VCC = 5.0 V

5.5

5.25
125

70

4.0

8.0

VCC = VCC MIN,

=

IN

IL

per Truth Table

CL = 15 pF

or

IH

IH

V

°C

mA

V

IN

V

OUT

AC WAVEFORMS

1.3 V
t

PHL

1.3 V

1.3 V
t

PLH

1.3 V

V

V

IN

OUT

1.3 V
t

PHL

1.3 V 1.3 V

t

PLH

1.3 V

Figure 1 Figure 2

FAST AND LS TTL DATA

5-3