54LS155LMQB [NSC]
Dual 2-Line to 4-Line Decoders/Demultiplexers; 双路2号线至4线解码器/多路解复用器
| 型号： | 54LS155LMQB |
| 厂家： | 
National Semiconductor |
| 描述： | Dual 2-Line to 4-Line Decoders/Demultiplexers |
| 文件： | 总8页 (文件大小：163K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54LS155/DM54LS155/DM74LS155,
54LS156/DM54LS156/DM74LS156
Dual 2-Line to 4-Line Decoders/Demultiplexers
Features
General Description
Y
Applications:
These TTL circuits feature dual 1-line-to-4-line demultiplex-
ers with individual strobes and common binary-address in-
puts in a single 16-pin package. When both sections are
enabled by the strobes, the common address inputs se-
quentially select and route associated input data to the ap-
propriate output of each section. The individual strobes per-
mit activating or inhibiting each of the 4-bit sections as de-
sired. Data applied to input C1 is inverted at its outputs and
data applied at C2 is true through its outputs. The inverter
following the C1 data input permits use as a 3-to-8-line de-
coder, or 1-to-8-line demultiplexer, without external gating.
Input clamping diodes are provided on these circuits to mini-
mize transmission-line effects and simplify system design.
Dual 2-to-4-line decoder
Dual 1-to-4-line demultiplexer
3-to-8-line decoder
1-to-8-line demultiplexer
Y
Individual strobes simplify cascading for decoding or
demultiplexing larger words
Y
Y
Input clamping diodes simplify system design
Choice of outputs:
Totem-pole (LS155)
Open-collector (LS156)
Y
Alternate Military/Aerospace device (54LS155/156) is
available. Contact a National Semiconductor Sales Of-
fice/Distributor for specifications.
Connection Diagram and Function Tables
Dual-In-Line Package
Order Number 54LS155DMQB, 54LS155FMQB,
54LS155LMQB, DM54LS155J, DM54LS155W,
DM74LS155M, DM74LS155N, 54LS156DMQB,
54LS156FMQB, DM54LS156J, DM54LS156W,
DM74LS156M or DM74LS156N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
2-Line-to-4-Line Decoder or
1-Line-to-4-Line Demultiplexer
Inputs
Strobe
G1
Outputs
Select
Data
C1
B
A
1Y0
1Y1
1Y2
1Y3
X
L
L
H
H
X
X
L
H
L
H
L
L
L
L
X
X
H
H
H
H
L
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
L
TL/F/6395–1
H
X
H
H
3-Line-to-8-Line Decoder or
1-Line-to-8-Line Demultiplexer
H
Inputs
Outputs
Inputs
Strobe
G2
Outputs
Strobe
Or Data
Select
Data
C2
Select
(0) (1) (2) (3) (4) (5) (6) (7)
2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3
B
A
2Y0
2Y1
2Y2
2Y3
²
³
G
C
B A
X
L
X
L
H
L
L
L
L
X
X
L
L
L
L
H
H
L
H
H
H
H
H
H
H
H
H
H
L
X
L
L
L
L
H
H
H
H
X X
L
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
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
L
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L H
H L
H H
H
H
H
H
H
H
H
H
H
X
H
X
H
H
H
L
L
L H
H L
H H
e
²
³
C
inputs C1 and C2 connected together
inputs G1 and G2 connected together
H
H
e
G
H
e
e
e
low level, X don’t care
H
high level, L
C
1995 National Semiconductor Corporation
TL/F/6395
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
DM54LS155
DM74LS155
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
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
0.4
mA
mA
OH
I
4
8
OL
b
T
A
55
125
0
70
C
§
’LS155 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
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
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
CC
V
CC
V
CC
Max, V
Max, V
Max
2.7V
0.4V
mA
IH
IL
I
b
0.36
mA
I
b
b
Short Circuit
DM54
DM74
20
20
100
100
OS
mA
mA
Output Current
(Note 2)
b
b
e
CC
I
Supply Current
V
Max (Note 3)
6.1
10
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, A,B, and C1 inputs at 4.5V, and C2, G1, and G2 inputs grounded.
A
CC
2
’LS155 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
A, B, C2, G1
or G2 to Y
PLH
PHL
PLH
PHL
PLH
PHL
18
22
35
24
35
24
35
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
A, B, C2, G1
or G2 to Y
27
18
27
20
27
Propagation Delay Time
Low to High Level Output
A or B
to Y
Propagation Delay Time
High to Low Level Output
A or B
to Y
Propagation Delay Time
Low to High Level Output
C1
to Y
Propagation Delay Time
High to Low Level Output
C1
to Y
Recommended Operating Conditions
DM54LS156
DM74LS156
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
IH
0.7
5.5
4
0.8
5.5
8
V
IL
High Level Output Voltage
Low Level Output Current
Free Air Operating Temperature
V
OH
I
mA
OL
b
T
A
55
125
0
70
C
§
’LS156 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
V
(Note 1)
e
e
e b
Min, I
I
b
1.5
V
I
Input Clamp Voltage
V
18 mA
CC
e
e
I
High Level Output
Current
V
V
Min, V
5.5V
Min
CEX
CC
O
100
mA
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
DM54
DM74
DM74
0.25
0.35
0.25
0.4
0.5
0.4
CC
OL
e
Max, V
IH
IL
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
Supply Current
V
CC
V
CC
V
CC
Max, V
Max, V
2.7V
0.4V
mA
mA
mA
IH
IL
I
b
0.36
10
I
Max (Note 2)
6.1
CC
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
is measured with all outputs open, A, B, and C1 inputs at 4.5V, and C2, G1, and G2 grounded.
CC
A
Note 2: I
CC
3
’LS156 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
A, B, C2, G1
or G2 to Y
PLH
PHL
PLH
PHL
PLH
PHL
28
53
43
53
43
53
43
ns
ns
ns
ns
ns
ns
Propagation Delay Time
High to Low Level Output
A, B, C2, G1
or G2 to Y
33
28
33
28
34
Propagation Delay Time
Low to High Level Output
A or B
to Y
Propagation Delay Time
High to Low Level Output
A or B
to Y
Propagation Delay Time
Low to High Level Output
C1
to Y
Propagation Delay Time
High to Low Level Output
C1
to Y
Logic Diagram
TL/F/6395–2
4
5
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier (E)
Order Number 54LS155LMQB
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS155DMQB, 54LS156DMQB, DM54LS155J or DM54LS156J
NS Package Number J16A
6
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS155M or DM74LS156M
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS155N or DM74LS156N
NS Package Number N16E
7
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS155FMQB, 54LS156FMQB, DM54LS155W or DM54LS156W
NS Package Number W16A
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