DM74LS139N [FAIRCHILD]
Decoder/Demultiplexer; 解码器/多路解复用器
| 型号： | DM74LS139N |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Decoder/Demultiplexer |
| 文件： | 总7页 (文件大小：85K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 1986
Revised March 2000
DM74LS138 • DM74LS139
Decoder/Demultiplexer
General Description
Features
These Schottky-clamped circuits are designed to be used
in high-performance memory-decoding or data-routing
applications, requiring very short propagation delay times.
In high-performance memory systems these decoders can
be used to minimize the effects of system decoding. When
used with high-speed memories, the delay times of these
decoders are usually less than the typical access time of
the memory. This means that the effective system delay
introduced by the decoder is negligible.
■ Designed specifically for high speed:
Memory decoders
Data transmission systems
■ DM74LS138 3-to-8-line decoders incorporates 3 enable
inputs to simplify cascading and/or data reception
■ DM74LS139 contains two fully independent 2-to-4-line
decoders/demultiplexers
■ Schottky clamped for high performance
■ Typical propagation delay (3 levels of logic)
DM74LS138 21 ns
The DM74LS138 decodes one-of-eight lines, based upon
the conditions at the three binary select inputs and the
three enable inputs. Two active-low and one active-high
enable inputs reduce the need for external gates or invert-
ers when expanding. A 24-line decoder can be imple-
mented with no external inverters, and a 32-line decoder
requires only one inverter. An enable input can be used as
a data input for demultiplexing applications.
DM74LS139 21 ns
■ Typical power dissipation
DM74LS138 32 mW
DM74LS139 34 mW
The DM74LS139 comprises two separate two-line-to-four-
line decoders in a single package. The active-low enable
input can be used as a data line in demultiplexing applica-
tions.
All of these decoders/demultiplexers feature fully buffered
inputs, presenting only one normalized load to its driving
circuit. All inputs are clamped with high-performance
Schottky diodes to suppress line-ringing and simplify sys-
tem design.
Ordering Code:
Order Number Package Number
Package Description
DM74LS138M
DM74LS138SJ
DM74LS138N
DM74LS139M
DM74LS139SJ
DM74LS139N
M16A
M16D
N16E
M16A
M16D
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
© 2000 Fairchild Semiconductor Corporation
DS006391
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Connection Diagrams
DM74LS138
DM74LS139
Function Tables
DM74LS138
DM74LS139
Inputs
Inputs
Select
Outputs
Outputs
Enable
Select
Enable
G1 G2 (Note 1)
C
B
X
X
L
A
YO Y1 Y2 Y3 Y4 Y5 Y6 Y7
G
H
L
B
X
L
A
X
L
Y0
H
L
Y1
Y2
H
H
H
L
Y3
H
H
H
H
L
X
L
H
X
L
L
L
L
L
L
L
L
X
X
L
X
X
L
H
H
L
H
H
H
L
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
H
H
H
L
L
H
L
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H = HIGH Level
L = LOW Level
X = Don’t Care
H
H
H
H
H
H
Note 1: G2 = G2A + G2B
Logic Diagrams
DM74LS138
DM74LS139
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2
Absolute Maximum Ratings(Note 2)
Note 2: 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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
Storage Temperature Range
0°C to +70°C
−65°C to +150°C
DM74LS138 Recommended Operating Conditions
Symbol
Parameter
Min
4.75
2
Nom
Max
Units
V
VCC
VIH
VIL
IOH
IOL
TA
Supply Voltage
5
5.25
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
V
0.8
−0.4
8
V
mA
mA
°C
0
70
DM74LS138 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions
Input Clamp Voltage = Min, I = −18 mA
Typ
Min
Max
Units
(Note 3)
V
V
V
V
V
V
−1.5
V
V
I
CC
CC
CC
I
HIGH Level Output Voltage
LOW Level
= Min, I = Max, V = Max, V = Min
2.7
3.4
OH
OL
OH
IL
IH
= Min, I = Max, V = Max, V = Min
0.35
0.25
0.5
0.4
OL
IL
IH
V
Output Voltage
I
= 4 mA, V = Min
OL CC
I
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
V
V
V
V
V
= Max, V = 7V
0.1
mA
µA
I
CC
CC
CC
CC
CC
I
I
= Max, V = 2.7V
20
IH
I
I
= Max, V = 0.4V
−0.36
−100
10
mA
mA
mA
IL
I
I
= Max (Note 4)
= Max (Note 5)
−20
OS
I
6.3
CC
Note 3: All typicals are at V = 5V, T = 25°C.
CC
A
Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 5: I is measured with all outputs enabled and OPEN.
CC
DM74LS138 Switching Characteristics
at VCC = 5V and T = 25°C
A
R
= 2 kΩ
From (Input)
To (Output)
Levels
L
Symbol
Parameter
C
= 15 pF
C
= 50 pF
Units
of Delay
L
L
Min
Max
Min
Max
t
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
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
PLH
Select to Output
Select to Output
Select to Output
Select to Output
Enable to Output
Enable to Output
Enable to Output
Enable to Output
2
2
3
3
2
2
3
3
18
27
18
27
18
24
18
28
27
ns
ns
ns
ns
ns
ns
ns
ns
t
t
t
t
t
t
t
PHL
PLH
PHL
PLH
PHL
PLH
PHL
40
27
40
27
40
27
40
3
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DM74LS139 Recommended Operating Conditions
Symbol
Parameter
Min
4.75
2
Nom
Max
Units
V
VCC
VIH
VIL
IOH
IOL
TA
Supply Voltage
5
5.25
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
V
0.8
−0.4
8
V
mA
mA
°C
0
70
DM74LS139 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions
Input Clamp Voltage = Min, I = −18 mA
Typ
Min
Max
Units
(Note 6)
V
V
V
V
V
V
V
−1.5
V
V
I
CC
I
HIGH Level
= Min, I = Max,
OH
OH
CC
2.7
3.4
Output Voltage
LOW Level
= Max, V = Min
IH
IL
V
= Min, I = Max
OL
OL
CC
0.35
0.25
0.5
Output Voltage
= Max, V = Min
V
IL
IH
I
= 4 mA, V = Min
0.4
0.1
OL
CC
I
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
V
= Max, V = 7V
mA
µA
I
CC
CC
CC
CC
CC
I
I
V
V
V
V
= Max, V = 2.7V
20
IH
I
I
= Max, V = 0.4V
−0.36
−100
11
mA
mA
mA
IL
I
I
= Max (Note 7)
= Max (Note 8)
−20
OS
I
6.8
CC
Note 6: All typicals are at V = 5V, T = 25°C.
CC
A
Note 7: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 8: I is measured with all outputs enabled and OPEN.
CC
DM74LS139 Switching Characteristics
at VCC = 5V and T = 25°C
A
R
= 2 kΩ
From (Input)
L
Symbol
Parameter
C
= 15 pF
C
= 50 pF
Units
To (Output)
L
L
Min
Max
Min
Max
t
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
PLH
Select to Output
Select to Output
Enable to Output
Enable to Output
18
27
18
24
27
ns
ns
ns
ns
t
PHL
40
27
40
t
PLH
t
PHL
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4
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
5
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
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6
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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.
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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