2000 Fairchild Semiconductor Corporation
DS006396
www.fairchildsemi.com
September 1986
Revised April 2000
DM74LS157
D
M
74LS15
8
Quad 2-Li
ne to 1-Li
ne Data Sele
ctor
s/Mul
t
i
p
lexer
s
DM74LS157 DM74LS158
Quad 2-Line to 1-Line Data Selectors/Multiplexers
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four out-
put gates. A separate strobe input is provided. A 4-bit word
is selected from one of two sources and is routed to the
four outputs. The DM74LS157 presents true data whereas
the DM74LS158 presents inverted data to minimize propa-
gation delay time.
Applications
Expand any data input point
Multiplex dual data buses
Generate four functions of two variables
(one variable is common)
Source programmable counters
Features
s
Buffered inputs and outputs
s
Typical Propagation Time
DM74LS157
9 ns
DM74LS158
7 ns
s
Typical Power Dissipation
DM74LS157
49 mW
DM74LS158
24 mW
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagrams
DM74LS157
DM74LS158
Order Number
Package Number
Package Description
DM74LS157M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS157SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS157N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74LS158M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS158N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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2
DM74LS157
DM74LS158
Function Table
H
=
HIGH Level
L
=
LOW Level
X
=
Don't Care
Logic Diagrams
DM74LS157
DM74LS158
Inputs
Output Y
Strobe
Select
A
B
DM74LS157 DM74LS158
H
X
X
X
L
H
L
L
L
X
L
H
L
L
H
X
H
L
L
H
X
L
L
H
L
H
X
H
H
L
3
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DM74LS157
D
M
74LS15
8
Absolute Maximum Ratings
(Note 1)
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.
DM74LS157 Recommended Operating Conditions
DM74LS157 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at V
CC
=
5V, T
A
=
25
C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: I
CC
is measured with 4.5V applied to all inputs and all outputs OPEN.
DM74LS157 Switching Characteristics
at V
CC
=
5V and T
A
=
25
C
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
0.4
mA
I
OL
LOW Level Output Current
8
mA
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
18 mA
-
1.5
V
V
OH
HIGH Level Output Voltage
V
CC
=
Min, I
OH
=
Max, V
IL
=
Max, V
IH
=
Min
2.7
3.4
V
V
OL
LOW
Level V
CC
=
Min, I
OL
=
Max, V
IL
=
Max, V
IH
=
Min
0.35
0.5
V
Output Voltage
I
OL
=
4 mA, V
CC
=
Min
0.25
0.4
I
I
Input Current @ Max
V
CC
=
Max
S or G
0.2
mA
Input Voltage
V
I
=
7V
A or B
0.1
I
IH
HIGH Level
V
CC
=
Max
S or G
40
A
Input Current
V
I
=
2.7V
A or B
20
I
IL
LOW
Level V
CC
=
Max
S or G
-
0.8
mA
Input Current
V
I
=
0.4V
A or B
-
0.4
I
OS
Short Circuit Output Current
V
CC
=
Max (Note 3)
-
20
-
100
mA
I
CC
Supply Current
V
CC
=
Max (Note 4)
9.7
16
mA
From (Input)
R
L
=
2 k
Symbol
Parameter
To (Output)
C
L
=
15 pF
C
L
=
50 pF
Units
Min
Max
Min
Max
t
PLH
Propagation Delay Time
Data to Y
14
18
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Data to Y
14
23
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Strobe to Y
20
24
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Strobe to Y
21
30
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Select to Y
23
28
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Select to Y
27
32
ns
HIGH-to-LOW Level Output
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4
DM74LS157
DM74LS158
DM74LS158 Recommended Operating Conditions
DM74LS158 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 5: All typicals are at V
CC
=
5V, T
A
=
25
C.
Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 7: I
CC
is measured with 4.5V applied to all inputs and all outputs OPEN.
DM74LS158 Switching Characteristics
at V
CC
=
5V and T
A
=
25
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
0.4
mA
I
OL
LOW Level Output Current
8
mA
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 5)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
18 mA
-
1.5
V
V
OH
HIGH Level
V
CC
=
Min, I
OH
=
Max
2.7
3.4
V
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
OL
LOW
Level V
CC
=
Min, I
OL
=
Max
0.35
0.5
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
I
OL
=
4 mA, V
CC
=
Min
0.25
0.4
I
I
Input Current @ Max
V
CC
=
Max
S or G
0.2
mA
Input Voltage
V
I
=
7V
A or B
0.1
I
IH
HIGH Level
V
CC
=
Max
S or G
40
A
Input Current
V
I
=
2.7V
A or B
20
I
IL
LOW
Level V
CC
=
Max
S or G
-
0.8
mA
Input Current
V
I
=
0.4V
A or B
-
0.4
I
OS
Short Circuit Output Current
V
CC
=
Max (Note 6)
-
20
-
100
mA
I
CC
Supply Current
V
CC
=
Max (Note 7)
4.8
8
mA
From (Input)
R
L
=
2 k
Symbol
Parameter
To (Output)
C
L
=
15 pF
C
L
=
50 pF
Units
Min
Max
Min
Max
t
PLH
Propagation Delay Time
Data to Y
12
18
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Data to Y
12
21
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Strobe to Y
17
23
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Strobe to Y
18
28
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Select to Y
20
24
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Select to Y
24
36
ns
HIGH-to-LOW Level Output
5
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DM74LS157
D
M
74LS15
8
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
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