54LS157W [NSC]
Quad 2-Line to 1-Line Data Selectors/Multiplexers; 四路2号线到1线数据选择器/多路复用器
| 型号： | 54LS157W |
| 厂家： | 
National Semiconductor |
| 描述： | Quad 2-Line to 1-Line Data Selectors/Multiplexers |
| 文件： | 总8页 (文件大小：162K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54LS157/DM54LS157/DM74LS157,
54LS158/DM54LS158/DM74LS158
Quad 2-Line to 1-Line Data Selectors/Multiplexers
General Description
Features
Y
Buffered inputs and outputs
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 LS157 presents true data whereas the LS158
presents inverted data to minimize propagation delay time.
Y
Typical Propagation Time
LS157 9 ns
LS158 7 ns
Y
Typical Power Dissipation
LS157 49 mW
LS158 24 mW
Y
Applications
Y
Alternate
Military/Aerospace
device
(54LS157,
54LS158) is available. Contact a National Semiconduc-
tor Sales Office/Distributor for specifications.
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
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL/F/6396–2
TL/F/6396–1
Order Number 54LS158DMQB, 54LS158FMQB,
54LS158LMQB, DM54LS158J, DM54LS158W,
DM74LS158M or DM74LS158N
Order Number 54LS157DMQB, 54LS157FMQB,
54LS157LMQB, DM54LS157J, DM54LS157W,
DM74LS157M or DM74LS157N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs
Output Y
Strobe
Select
A
B
LS157
LS158
H
L
L
L
L
X
L
X
L
X
X
X
L
L
L
H
H
L
L
H
X
X
H
L
H
H
H
L
H
H
e
e
e
Low Level, X Don’t Care
H
High Level, L
C
1995 National Semiconductor Corporation
TL/F/6396
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.
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed. 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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
DM54LS and 54LS
DM74LS
b
b
a
a
55 C to 125 C
§
§
0 C to 70 C
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM54LS157
DM74LS157
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
0.4
I
I
0.4
mA
mA
OH
OL
4
8
b
T
A
55
125
0
70
C
§
’LS157 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
S or G
A or B
S or G
A or B
S or G
A or B
DM54
DM74
2.5
2.7
3.4
3.4
OH
CC
OH
e
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
0.25
0.35
0.25
0.4
CC
OL
e
Max, V
IH
IL
0.5
0.4
0.2
0.1
40
V
e
e
Min
I
4 mA, V
CC
OL
@
Input Current Max
e
CC
I
I
I
I
I
V
Max
I
mA
mA
mA
e
Input Voltage
V
I
7V
e
High Level Input
Current
V
V
Max
Max
Max
IH
CC
e
2.7V
I
20
e
b
0.8
Low Level Input
Current
V
V
IL
CC
e
0.4V
I
b
0.4
100
100
e
b
b
b
Short Circuit
V
CC
20
20
OS
CC
mA
mA
Output Current
(Note 2)
b
e
Supply Current
V
CC
Max (Note 3)
9.7
16
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with 4.5V applied to all inputs and all outputs open.
A
CC
2
’LS157 Switching Characteristics
5V and T
e
e
A
at V
25 C (See Section 1 for Test Waveforms and Output Load)
§
CC
e
R
L
2 kX
From (Input)
To (Output)
e
e
L
Symbol
Parameter
C
L
15 pF
C
50 pF
Max
Units
Min
Max
Min
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
Data
to Y
PLH
PHL
PLH
PHL
PLH
PHL
14
18
23
24
30
28
32
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
Data
to Y
14
20
21
23
27
Propagation Delay Time
Low to High Level Output
Strobe
to Y
Propagation Delay Time
High to Low Level Output
Strobe
to Y
Propagation Delay Time
Low to High Level Output
Select
to Y
Propagation Delay Time
High to Low Level Output
Select
to Y
Recommended Operating Conditions
DM54LS158
DM74LS158
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
0.4
I
I
0.4
mA
mA
OH
OL
4
8
b
T
A
55
125
0
70
C
§
’LS158 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
S or G
A or B
S or G
A or B
S or G
A or B
DM54
DM74
2.5
2.7
3.4
3.4
OH
CC
OH
e
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
0.25
0.35
0.25
0.4
CC
OL
e
Max, V
IH
IL
0.5
0.4
0.2
0.1
40
V
e
e
Min
I
4 mA, V
CC
OL
@
Input Current Max
e
CC
I
I
I
I
I
V
Max
I
mA
mA
mA
e
Input Voltage
V
I
7V
e
2.7V
High Level Input
Current
V
V
Max
Max
Max
IH
CC
e
I
20
e
0.4V
b
0.8
Low Level Input
Current
V
V
IL
CC
e
I
b
0.4
100
100
8
e
(Note 2)
b
b
b
Short Circuit
V
CC
20
20
OS
CC
mA
mA
Output Current
b
e
Supply Current
V
CC
Max (Note 3)
4.8
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with 4.5V applied to all inputs and all outputs open.
A
CC
3
’LS158 Switching Characteristics
5V and T
e
e
A
at V
25 C (See Section 1 for Test Waveforms and Output Load)
§
CC
e
R
L
2 kX
From (Input)
e
e
L
Symbol
Parameter
C
15 pF
C
50 pF
Max
Units
To (Output)
L
Min
Max
Min
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
Data
to Y
PLH
PHL
PLH
PHL
PLH
PHL
12
18
21
23
28
24
36
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
Data
to Y
12
17
18
20
24
Propagation Delay Time
Low to High Level Output
Strobe
to Y
Propagation Delay Time
High to Low Level Output
Strobe
to Y
Propagation Delay Time
Low to High Level Output
Select
to Y
Propagation Delay Time
High to Low Level Output
Select
to Y
Logic Diagrams
LS157
LS158
TL/F/6396–4
TL/F/6396–3
4
5
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS157LMQB or 54LS158LMQB
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS157DMQB, 54LS158DMQB, DM54LS157J or DM54LS158J
NS Package Number J16A
6
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS157M or DM74LS158M
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS157N or DM74LS158N
NS Package Number N16E
7
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS157FMQB, 54LS158FMQB, DM54LS157W or DM54LS158W
NS Package Number W16A
LIFE SUPPORT POLICY
NATIONAL’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 NATIONAL
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 whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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