NSC JM38510-30903BF, JM38510-30903BE, JM38510-30903B2 Datasheet
TL/F/6396
54LS157/DM54LS157/DM74LS157, 54LS158/DM54LS158/DM74LS158
Quad 2-Line to 1-Line Data Selectors/Multiplexers
June 1989
54LS157/DM54LS157/DM74LS157,
54LS158/DM54LS158/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 output 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 LS157 presents true data whereas the LS158
presents inverted data to minimize propagation delay time.
Applications
Y
Expand any data input point
Y
Multiplex dual data buses
Y
Generate four functions of two variables (one variable
is common)
Y
Source programmable counters
Features
Y
Buffered inputs and outputs
Y
Typical Propagation Time
LS157 9 ns
LS158 7 ns
Y
Typical Power Dissipation
LS157 49 mW
LS158 24 mW
Y
Alternate Military/Aerospace device (54LS157,
54LS158) is available. Contact a National Semiconductor Sales Office/Distributor for specifications.
Connection Diagrams
Dual-In-Line Package
TL/F/6396– 1
Order Number 54LS157DMQB, 54LS157FMQB,
54LS157LMQB, DM54LS157J, DM54LS157W,
DM74LS157M or DM74LS157N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Dual-In-Line Package
TL/F/6396– 2
Order Number 54LS158DMQB, 54LS158FMQB,
54LS158LMQB, DM54LS158J, DM54LS158W,
DM74LS158M or DM74LS158N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs Output Y
Strobe Select A B LS157 LS158
HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL
H
e
High Level, LeLow Level, XeDon’t Care
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS and 54LS
b
55§Ctoa125§C
DM74LS 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
Note:
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’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
Recommended Operating Conditions
Symbol Parameter
DM54LS157 DM74LS157
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.7 0.8 V
I
OH
High Level Output Current
b
0.4
b
0.4 mA
I
OL
Low Level Output Current 4 8 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
’LS157 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
18 mA
b
1.5 V
V
OH
High Level Output V
CC
e
Min, I
OH
e
Max DM54 2.5 3.4
V
Voltage V
IL
e
Max, V
IH
e
Min
DM74 2.7 3.4
V
OL
Low Level Output V
CC
e
Min, I
OL
e
Max DM54 0.25 0.4
Voltage V
IL
e
Max, V
IH
e
Min
DM74 0.35 0.5 V
I
OL
e
4 mA, V
CC
e
Min DM74 0.25 0.4
I
I
Input Current@Max V
CC
e
Max S or G 0.2
mA
Input Voltage V
I
e
7V
AorB 0.1
I
IH
High Level Input V
CC
e
Max S or G 40
mA
Current V
I
e
2.7V
AorB 20
I
IL
Low Level Input V
CC
e
Max SorG
b
0.8
mA
Current V
I
e
0.4V
AorB
b
0.4
I
OS
Short Circuit V
CC
e
Max DM54
b
20
b
100
mA
Output Current (Note 2)
DM74
b
20
b
100
I
CC
Supply Current V
CC
e
Max (Note 3) 9.7 16 mA
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I
CC
is measured with 4.5V applied to all inputs and all outputs open.
2
’LS157 Switching Characteristics
at V
CC
e
5V and T
A
e
25§C (See Section 1 for Test Waveforms and Output Load)
From (Input)
R
L
e
2kX
Symbol Parameter
To (Output)
C
L
e
15 pF C
L
e
50 pF Units
Min Max Min Max
t
PLH
Propagation Delay Time Data
14 18 ns
Low to High Level Output to Y
t
PHL
Propagation Delay Time Data
14 23 ns
High to Low Level Output to Y
t
PLH
Propagation Delay Time Strobe
20 24 ns
Low to High Level Output to Y
t
PHL
Propagation Delay Time Strobe
21 30 ns
High to Low Level Output to Y
t
PLH
Propagation Delay Time Select
23 28 ns
Low to High Level Output to Y
t
PHL
Propagation Delay Time Select
27 32 ns
High to Low Level Output to Y
Recommended Operating Conditions
Symbol Parameter
DM54LS158 DM74LS158
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.7 0.8 V
I
OH
High Level Output Current
b
0.4
b
0.4 mA
I
OL
Low Level Output Current 4 8 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
’LS158 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
18 mA
b
1.5 V
V
OH
High Level Output V
CC
e
Min, I
OH
e
Max DM54 2.5 3.4
V
Voltage V
IL
e
Max, V
IH
e
Min
DM74 2.7 3.4
V
OL
Low Level Output V
CC
e
Min, I
OL
e
Max DM54 0.25 0.4
Voltage V
IL
e
Max, V
IH
e
Min
DM74 0.35 0.5 V
I
OL
e
4 mA, V
CC
e
Min DM74 0.25 0.4
I
I
Input Current@Max V
CC
e
Max S or G 0.2
mA
Input Voltage V
I
e
7V
AorB 0.1
I
IH
High Level Input V
CC
e
Max S or G 40
mA
Current V
I
e
2.7V
AorB 20
I
IL
Low Level Input V
CC
e
Max SorG
b
0.8
mA
Current V
I
e
0.4V
AorB
b
0.4
I
OS
Short Circuit V
CC
e
Max DM54
b
20
b
100
mA
Output Current (Note 2)
DM74
b
20
b
100
I
CC
Supply Current V
CC
e
Max (Note 3) 4.8 8 mA
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I
CC
is measured with 4.5V applied to all inputs and all outputs open.
3
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