SN74LS151
8-Input Multiplexer
The TTL / MSI SN74LS151 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.
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•
•
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Schottky Process for High Speed
Multifunction Capability
On-Chip Select Logic Decoding
Fully Buffered Complementary Outputs
Input Clamp Diodes Limit High Speed Termination Effects
LOW
POWER
SCHOTTKY
GUARANTEED OPERATING RANGES
Symbol
V
CC
T
A
I
OH
I
OL
Parameter
Supply Voltage
Operating Ambient
Temperature Range
Output Current – High
Output Current – Low
Min
4.75
0
Typ
5.0
25
Max
5.25
70
– 0.4
8.0
Unit
V
°C
mA
mA
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
SN74LS151N
SN74LS151D
Package
16 Pin DIP
16 Pin
Shipping
2000 Units/Box
2500/Tape & Reel
©
Semiconductor Components Industries, LLC, 1999
1
December, 1999 – Rev. 6
Publication Order Number:
SN74LS151/D
SN74LS151
CONNECTION DIAGRAM DIP
(TOP VIEW)
V
CC
16
I
4
15
I
5
14
I
6
13
I
7
12
S
0
11
S
1
10
S
2
9
1
I
3
2
I
2
3
I
1
4
I
0
5
Z
6
Z
7
E
8
GND
LOADING
(Note a)
PIN NAMES
S
0
– S
2
E
I
0
– I
7
Z
Z
Select Inputs
Enable (Active LOW) Input
Multiplexer Inputs
Multiplexer Output
Complementary Multiplexer Output
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 U.L.
5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
m
A HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 5 U.L. for Commercial (74) Temperature Ranges.
LOGIC SYMBOL
7 4 3 2 1 15 14 13 12
E I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
S
0
S
1
S
2
Z
Z
6
5
11
10
9
V
CC
= PIN 16
GND = PIN 8
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2
SN74LS151
LOGIC DIAGRAM
I
0
S
2
S
1
11
9
10
4
I
1
3
I
2
2
I
3
1
I
4
15
I
5
14
I
6
13
I
7
12
S
0
7
E
V
CC
= PIN 16
GND = PIN 8
= PIN NUMBERS
6
5
Z
Z
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, S
0
, S
1
, S
2
. 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
⋅
(I
0
⋅
S
0
⋅
S
1
⋅
S
2
+
⋅
I
1
⋅
S
0
⋅
S
1
⋅
S
2
+ I
2
⋅
S
0
⋅
S
1
⋅
S
2
+ I
3
⋅
S
0
⋅
S
1
⋅
S
2
+ I
4
⋅
S
0
⋅
S
1
⋅
S
2
+ I
5
⋅
S
0
⋅
S
1
⋅
S
2
+ I
6
⋅
S
0
⋅
S
1
⋅
S
2
+ I
7
⋅
S
0
⋅
S
1
⋅
S
2
).
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
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
S
2
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
S
1
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
S
0
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
I
0
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
I
1
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
I
2
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
I
3
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
I
4
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
I
5
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
I
6
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
I
7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
Z
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Z
L
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
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3
SN74LS151
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
V
IH
V
IL
V
IK
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
2.7
– 0.65
3.5
0.25
V
O
OL
Output LOW Voltage
0.35
I
IH
I
IL
I
OS
I
CC
Input HIGH Current
Input LOW Current
Short Circuit Current (Note 1)
Power Supply Current
– 20
0.5
20
0.1
– 0.4
– 100
10
V
µA
mA
mA
mA
mA
0.4
Min
2.0
0.8
– 1.5
Typ
Max
Unit
V
V
V
V
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
V
CC
= MIN, I
IN
= – 18 mA
V
CC
= MIN, I
OH
= MAX, V
IN
= V
IH
or V
IL
per Truth Table
I
OL
= 4.0 mA
I
OL
= 8.0 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
per Truth Table
V
CC
= MAX, V
IN
= 2.7 V
V
CC
= MAX, V
IN
= 7.0 V
V
CC
= MAX, V
IN
= 0.4 V
V
CC
= MAX
V
CC
= MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(T
A
= 25°C)
Limits
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
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
Min
Typ
27
18
14
20
26
20
15
18
20
16
13
12
Max
43
30
23
32
42
32
24
30
32
26
21
20
Unit
ns
ns
ns
ns
ns
ns
Test Conditions
V
CC
= 5.0 V
C
L
= 15 pF
AC WAVEFORMS
V
IN
1.3 V
t
PHL
1.3 V
t
PLH
1.3 V
V
IN
1.3 V
t
PHL
t
PLH
1.3 V
V
OUT
1.3 V
V
OUT
1.3 V
1.3 V
Figure 1.
Figure 2.
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4
SN74LS151
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
–A–
16
9
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
DIM
A
B
C
D
F
G
H
J
K
L
M
S
INCHES
MIN
MAX
0.740
0.770
0.250
0.270
0.145
0.175
0.015
0.021
0.040
0.70
0.100 BSC
0.050 BSC
0.008
0.015
0.110
0.130
0.295
0.305
0
_
10
_
0.020
0.040
MILLIMETERS
MIN
MAX
18.80
19.55
6.35
6.85
3.69
4.44
0.39
0.53
1.02
1.77
2.54 BSC
1.27 BSC
0.21
0.38
2.80
3.30
7.50
7.74
0
_
10
_
0.51
1.01
B
1
8
F
S
C
L
–T–
H
G
D
16 PL
SEATING
PLANE
K
J
T A
M
M
0.25 (0.010)
M
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