DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer
August 1986
Revised April 2000
DM74S157 • DM74S158
Quad 1 of 2 Line Data Selector/Multiplexer
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 DM74S157 presents true data whereas
the DM74S158 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
DM74S157
DM74S158
DM74S157
DM74S158
5 ns
4 ns
250 mW
195 mW
s
Typical power dissipation
Ordering Code:
Order Number
DM74S157N
DM74S158N
Package Number
N16E
N16E
Package Description
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagrams
DM74S157
DM74S158
© 2000 Fairchild Semiconductor Corporation
DS006470
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DM74S157 • DM74S158
Function Table
Inputs
Strobe
H
L
L
L
L
H
=
HIGH Level
L
=
LOW Level
X
=
Don’t Care
Output Y
A
X
L
H
X
X
B
X
X
X
L
H
DM74S157 DM74S158
L
L
H
L
H
H
H
L
H
L
Select
X
L
L
H
H
Logic Diagrams
DM74S157
DM74S158
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2
DM74S157 • DM74S158
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
5.5V
0°C to
+70°C
−65°C
to
+150°C
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.
DM74157 Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Parameter
Min
4.75
2
0.8
−1
20
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
DM74S157 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
HIGH Level
Input Current
HIGH Level
Input Current
Short Circuit Output Current
Supply Current
Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max
V
I
=
2.7V
V
CC
=
Max
V
I
=
0.5V
V
CC
=
Max (Note 3)
V
CC
=
Max (Note 4)
S or G
A or B
S or G
A or B
−40
50
2.7
3.4
0.5
1
100
50
−4
−2
−100
78
Min
Typ
(Note 2)
Max
−1.2
Units
V
V
V
mA
µA
mA
mA
mA
Input Current @ Max Input Voltage V
CC
=
Max, V
I
=
5.5V
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 4.5V applied to all inputs and all outputs OPEN.
DM74S157 Switching Characteristics
at V
CC
=
5V and T
A
=
25°C
R
L
=
280Ω
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
From (Input)
To (Output)
Data to Y
Data to Y
Strobe to Y
Strobe to Y
Select to Y
Select to Y
C
L
=
15 pF
Min
Max
7.5
6.5
12.5
12
15
15
C
L
=
50 pF
Min
Max
10
10
15
15
17
17
ns
ns
ns
ns
ns
ns
Units
3
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DM74S157 • DM74S158
DM74S158 Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Parameter
Min
4.75
2
0.8
−1
20
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
DM74S158 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CC1
I
CC2
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
HIGH Level
Input Current
LOW Level
Input Current
Short Circuit Output Current
Supply Current
Supply Current
Conditions
V
CC
=
Min, I
I
= −
18 mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max
V
I
=
2.7V
V
CC
=
Max
V
I
=
0.5V
V
CC
=
Max (Note 6)
V
CC
=
Max (Note 7)
V
CC
=
Max (Note 8)
S or G
A or B
S or G
A or B
−40
39
2.7
3.4
0.5
1
100
50
−4
−2
−100
61
81
Min
Typ
(Note 5)
Max
−1.2
Units
V
V
V
mA
µA
mA
mA
mA
mA
Input Current @ Max Input Voltage V
CC
=
Max, V
I
=
5.5V
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
CC1
is measured with all outputs OPEN and all inputs at 4.5V.
Note 8:
I
CC2
is measured with B, G, and S inputs grounded, A inputs at 4.5V, and all outputs OPEN.
DM74S158 Switching Characteristics
at V
CC
=
5V and T
A
=
25
°C
R
L
=
280Ω
Symbol
Parameter
From (Input)
To (Output)
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay Time
LOW to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Data to Y
Data to Y
Strobe to Y
Strobe to Y
Select to Y
Select to Y
C
L
=
15 pF
Min
Max
6
6
11.5
12
12
12
C
L
=
50 pF
Min
Max
9
9
12
14
15
15
ns
ns
ns
ns
ns
ns
Units
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4
DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
5
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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