Page 1
QUAD 2-INPUT MULTIPLEXER
The LSTTL/MSI SN54L/74LS158 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 LS158 can also generate any four of the 16 different
functions of two variables. The LS158 is fabricated with the Schottky barrier
diode process for high speed and is completely compatible with all Motorola
TTL families.
• Schottky Process for High Speed
• Multifunction Capability
• Inverted Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
• ESD > 3500 Volts
• Special Circuitry Ensures Glitch Free Multiplexing
SN54/74LS158
QUAD 2-INPUT MULTIPLEXER
LOW POWER SCHOTTKY
CONNECTION DIAGRAM DIP (TOP VIEW)
V
CC
16 15
123456
S
PIN NAMES LOADING (Note a)
S
E
I0a–I
0d
I1a–I
1d
Z
a–Zd
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.
I0cI
E
14 13 12 11 10 9
I0aI
1a
Common Select Input
Enable (Active LOW) Input
Data Inputs from Source 0
Data Inputs from Source 1
Inverted Outputs (Note b)
Z
1c
Z
aI0bI1bZb
I
c
0d
I
1d
7
Z
d
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
8
GND
HIGH
1.0 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
LOW
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
LOGIC DIAGRAM
I
0aI1aI0bI1bI0cI1cI0dI1d
3
5
14 126
11
13 15
E S
10
CERAMIC
16
1
16
1
16
1
CASE 620-09
N SUFFIX
CASE 648-08
D SUFFIX
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
15 2 3 5 6 14 13 11 10
J SUFFIX
PLASTIC
SOIC
4
Z
a
7
Z
b
EI0aI1aI0bI1bI0cI1cI0dI
1
S
ZaZbZcZ
4 7 12 9
VCC = PIN 16
GND = PIN 8
12
Z
c
9
Z
d
= PIN NUMBERS
VCC = PIN 16
GND = PIN 8
1d
d
FAST AND LS TTL DAT A
5-1
Page 2
SN54/74LS158
FUNCTIONAL DESCRIPTION
The LS158 is a Quad 2-input Multiplexer fabricated with the
Schottky barrier diode process for high speed. It 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
HIGH, all of the outputs (Z
other inputs.
The LS158 is the logic implementation of a 4-pole,
2-position switch where the position of the switch is deter-
) is active LOW. When E is
) are forced HIGH regardless of all
TRUTH TABLE
SELECT
ENABLE
E S I
H X X X H
L L L XH
L L HXL
L H XLH
L H XHL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
INPUT
mined by the logic levels supplied to the Select Input.
A common use of the LS158 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 LS158 can generate four functions of two
variables with one variable common. This is useful for
implementing gating functions.
INPUTS OUTPUT
0
I
1
Z
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
T
I
OH
I
OL
CC
A
Supply Voltage 54
74
Operating Ambient Temperature Range 54
74
Output Current — High 54, 74 –0.4 mA
Output Current — Low 54
74
4.5
4.75
–55
0
5.0
5.0
25
25
5.5
5.25
125
70
4.0
8.0
V
°C
mA
FAST AND LS TTL DATA
5-2
Page 3
SN54/74LS158
VILI
LOW Volt
V
pg
VOHOutput HIGH Volt
CC
,
OH
,
IN IH
VOLOutput LOW Volt
V
V
V
I
IH
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
V
IH
V
IK
I
IH
I
IL
I
OS
I
CC
I
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
Input HIGH Voltage 2.0 V
nput
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
Input HIGH Current
I0, I
1
E
, S
I0, I
1
E
, S
Input LOW Current
I0, I
1
E
, S
Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
Power Supply Current 8.0 mA VCC = MAX
Power Supply Current 11 mA VCC = MAX
age
age
age
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
Min Typ Max
0.1
0.2
–0.4
–0.8
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
20
40
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
IH
VCC = VCC MIN,
=
or
IN
IL
per Truth Table
All inputs at 4.5 V .
All outputs open.
All other input
combinations.
All outputs open.
IH
AC CHARACTERISTICS (T
Symbol Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay
Data to Output
Propagation Delay
Enable to Output
Propagation Delay
Select to Output
V
IN
V
OUT
A
1.3 V
= 25°C)
Limits
Min Typ Max
7.0
10
11
18
13
16
Unit Test Conditions
12
15
17
24
20
24
ns Figure 2
ns Figure 1
ns Figure 2
AC WAVEFORMS
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
Figure 1 Figure 2
1.3 V
VCC = 5.0 V
CL = 15 pF
t
PLH
1.3 V
FAST AND LS TTL DATA
5-3
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