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Motorola Electronic Components Datasheet

74LS151 Datasheet

8-INPUT MULTIPLEXER

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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)
VCC I4
16 15
I5
14
I6 I7 S0
13 12 11
S1 S2
10 9
1 2 3 4 56
I3 I2 I1 I0 Z Z
78
E GND
PIN NAMES
S0 – S2
E
I0 – I7
Z
Z
Select Inputs
Enable (Active LOW) Input
Multiplexer Inputs
Multiplexer Output (Note b)
Complementary Multiplexer Output
(Note b)
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
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)
Temperature Ranges.
SN54/74LS151
8-INPUT MULTIPLEXER
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
7 4 3 2 1 15 14 13 12
11
E
S0
I0
I1
I2
I3
I4
I5
I6 I7
10 S1
9 S2
ZZ
65
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
5-252


Motorola Electronic Components Datasheet

74LS151 Datasheet

8-INPUT MULTIPLEXER

No Preview Available !

LOGIC DIAGRAM
9
S2
10
S1
11
S0
7
E
SN54 / 74LS151
I0 I1 I2 I3 I4 I5 I6 I7
4 3 2 1 15 14 13 12
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
65
ZZ
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:
Z = E (I0 S0 S1 S2 + I1 S0 S1 S2 + I2 S0 S1 S2
+ I3 S0 S1 S2 + I4 S0 S1 S2 + I5 S0 S1 S2 + I6 S0
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.
TRUTH TABLE
E S2 S1 S0 I0 I1 I2 I3 I4 I5 I6 I7 Z Z
HXXXXXXXXXXXHL
L L L L LXXXXXXXHL
L L L LHXXXXXXXLH
L L LHXLXXXXXXHL
L L LHXHXXXXXXLH
L LHLXXLXXXXXHL
L LHLXXHXXXXXLH
L LHHXXX L XXXXHL
L LHHXXXHXXXX LH
LHL LXXXXLXXXHL
LHL LXXXXHXXXLH
L H L HXXXXX L XXH L
L H L HXXXXXHXX L H
LHHL XXXXXX L XHL
LHHL XXXXXXHX LH
LHHHXXXXXXX LHL
L HHHX X X X X X XH L H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
FAST AND LS TTL DATA
5-253


Part Number 74LS151
Description 8-INPUT MULTIPLEXER
Maker Motorola
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74LS151 Datasheet PDF






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