DM74LS42 [NSC]
Decimal Decoders; 十进制解码器![DM74LS42](http://pdffile.icpdf.com/pdf1/p00086/img/icpdf/DM74LS42_454389_icpdf.jpg)
型号: | DM74LS42 |
厂家: | ![]() |
描述: | Decimal Decoders |
文件: | 总6页 (文件大小:131K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
June 1989
54LS42/DM54LS42/DM74LS42 BCD/Decimal Decoders
General Description
Features
Y
Diode clamped inputs
These BCD-to-decimal decoders consist of eight inverters
and ten, four-input NAND gates. The inverters are connect-
ed in pairs to make BCD input data available for decoding
by the NAND gates. Full decoding of input logic ensures
that all outputs remain off for all invalid (10–15) input condi-
tions.
Y
Also for applications as 4-line-to-16-line decoders; 3-
line-to-8-line decoders
Y
Y
All outputs are high for invalid input conditions
Alternate Military/Aerospace device (54LS42) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Function Table
Dual-In-Line Package
BCD Inputs
No.
Decimal Outputs
D
C
B
A
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
L
L
L
L
L
L
L
L
L
H
L
L
L
H
L
L
H
H
H
H
H
L
H
H
L
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
5
6
7
8
9
L
L
H
H
H
L
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
H
H
H
H
H
H
H
L
L
H
H
I
H
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
N
V
A
L
I
TL/F/6365–1
Order Number 54LS42DMQB, 54LS42FMQB,
H
H
H
H
L
H
L
DM54LS42J, DM54LS42W, DM74LS42M or DM74LS42N
See NS Package Number J16A, M16A, N16E or W16A
H
H
H
D
e
e
H
L
High Level
Low Level
Logic Diagram
TL/F/6365–2
C
1995 National Semiconductor Corporation
TL/F/6365
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
DM54LS42
DM74LS42
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
§
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
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
2.5
2.7
3.4
3.4
OH
CC
OH
V
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
V
e
e
I
4 mA, V
CC
Min
OL
@
Input Current Max
e
e
I
V
Max, V
7V
I
CC
I
0.1
20
mA
Input Voltage
e
e
e
e
e
I
I
I
High Level Input Current
Low Level Input Current
V
V
V
Max, V
Max, V
Max
2.7V
0.4V
mA
IH
IL
CC
CC
CC
I
b
0.4
100
100
mA
I
b
b
b
b
Short Circuit
DM54
DM74
20
20
OS
mA
mA
Output Current
(Note 2)
e
CC
I
Supply Current
V
Max (Note 3)
7
13
CC
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 all outputs open and all inputs grounded.
A
CC
2
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
Switching Characteristics at V
5V and T
§
CC
A
e
R
2 kX
L
From (Input)
To (Output)
e
e
L
Symbol
Parameter
C
15 pF
C
50 pF
Max
Units
L
Min
Max
Min
t
t
t
t
Propagation Delay Time
High to Low Level Output
A, B, C, or D (2 Levels
of Logic) to Output
PHL
PHL
PLH
PLH
25
30
35
30
35
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
A, B, C, or D (3 Levels
of Logic) to Output
30
25
30
Propagation Delay Time
Low to High Level Output
A, B, C, or D (2 Levels
of Logic) to Output
Propagation Delay Time
Low to High Level Output
A, B, C, or D (3 Levels
of Logic) to Output
3
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS42DMQB or DM54LS42J
NS Package Number J16A
4
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS42M
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS42N
NS Package Number N16E
5
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS42FMQB or DM54LS42W
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:
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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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