54LS139DMQB [TI]

IC,DECODER/DEMUX,2-TO-4-LINE,LS-TTL,DIP,16PIN,CERAMIC;
54LS139DMQB
型号: 54LS139DMQB
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

IC,DECODER/DEMUX,2-TO-4-LINE,LS-TTL,DIP,16PIN,CERAMIC

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54LS138,54LS139,DM54LS138,DM54LS139,  
DM74LS138,DM74LS139  
54LS138 DM54LS138 DM74LS138 54LS139 DM54LS139 DM54LS139  
Decoders/Demultiplexers  
Literature Number: SNOS280A  
June 1989  
54LS138/DM54LS138/DM74LS138,  
54LS139/DM54LS139/DM74LS139  
Decoders/Demultiplexers  
General Description  
These Schottky-clamped circuits are designed to be used in  
high-performance memory-decoding or data-routing appli-  
cations, 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 intro-  
duced by the decoder is negligible.  
Schottky diodes to suppress line-ringing and simplify system  
design.  
Features  
Y
Designed specifically for high speed:  
Memory decoders  
Data transmission systems  
Y
LS138 3-to-8-line decoders incorpoable n-  
puts to simplify cascading nd/or dattion  
The LS138 decodes one-of-eight lines, based upon the con-  
ditions 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 inverters when ex-  
panding. A 24-line decoder can be implemented with no ex-  
ternal inverters, and a 32-line decoder requires only one  
inverter. An enable input can be used as a data input for  
demultiplexing applications.  
Y
LS139 contains two fully inndent 24-line ded-  
ers/demultiplexers  
Y
Schottky clamped for high perfornce  
Y
Typical propagation levels oogic
LS138 21 ns  
LS139 21 ns  
Y
Typicower di
LS138 2 mW  
LS139 mW  
The LS139 comprises two separate two-line-to-four-line de-  
coders in a single package. The active-low enable input can  
be used as a data line in demultiplexing applications.  
Y
Alternate  
Mary/Aerospace  
devices  
(54LS138,  
5are aable. Contact a National Semicon-  
Officestributor for specifications.  
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  
Connection Diagrams  
Dual-in-Line Package  
Dual-in-Line Package  
TL/F/6391–1  
Order Number 54LS138DMQB, 54LS138FMQB,  
54LS138LMQB, DM54LS138J, DM54LS138W,  
DM74LS138M or DM74LS138N  
TL/F/6391–2  
Order Number 54LS139DMQB, 54LS139FMQB,  
54LS139LMQB, DM54LS139J, DM54LS139W,  
DM74LS139M or DM74LS139N  
See NS Package Number E20A, J16A,  
M16A, N16E or W16A  
See NS Package Number E20A, J16A,  
M16A, N16E or W16A  
C
1995 National Semiconductor Corporation  
TL/F/6391  
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  
DM54LS138  
DM74LS138  
Symbol  
Parameter  
Units  
Min  
4.5  
2
Nom  
Max  
Min  
4.75  
2
Nom  
Max  
V
V
V
Supply Voltage  
5
5.5  
5
5.2
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
V
IL  
b
b
0.4  
I
I
0.4  
m
mA  
OH  
OL  
4
8
b
T
A
55  
125  
0
C
§
’LS138 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  
DM
M54  
M74  
DM74  
5  
2.7  
3.4  
3.4  
OH  
CC  
OH  
e
Max, V  
IL  
IH  
e
e
V
OL  
Low Level Output  
Voltage  
V
V
Min, I  
Ma
n  
0.25  
0.35  
0.25  
0.4  
CC  
O
e
Max, V  
IH  
IL  
0.5  
0.4  
V
e
I
C  
O
@
Input Current Max  
I
7V  
I
0.1  
20  
mA  
Input Voltage  
e
e
e
I
I
I
High Level
Low Lev
V
CC  
CC  
C  
M, V  
Max  
2.7V  
0.4V  
mA  
IH  
IL  
b
0.36  
mA  
I
b
b
Short C
DM54  
DM74  
20  
20  
100  
100  
OS  
mA  
mA  
Output C
ote 2)  
b
b
e
CC  
I
Supply Curr
V
Max (Note 3)  
6.3  
10  
CC  
e
Note 1: All typicals are at V  
5V,
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 enabled and open.  
CC  
2
’LS138 Switching Characteristics  
5V and T  
e
e
at V  
25 C (See Section 1 for Test Waveforms and Output Load)  
§
CC  
A
e
R
2 kX  
L
From (Input)  
To (Output)  
Levels  
e
e
L
Symbol  
Parameter  
C
L
15 pF  
C
50 pF  
Max  
Units  
of Delay  
Min  
Max  
Min  
t
t
t
t
t
t
t
t
Propagation Delay Time  
Low to High Level Output  
Select to  
Output  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
PLH  
PHL  
2
2
3
3
2
2
3
3
18  
27  
40  
27  
40  
40  
40  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
Propagation Delay Time  
High to Low Level Output  
Select to  
Output  
27  
18  
27  
18  
24  
18  
Propagation Delay Time  
Low to High Level Output  
Select to  
Output  
Propagation Delay Time  
High to Low Level Output  
Select to  
Output  
Propagation Delay Time  
Low to High Level Output  
Enable to  
Output  
Propagation Delay Time  
High to Low Level Output  
Enable to  
Output  
Propagation Delay Time  
Low to High Level Output  
Enable to  
Output  
Propagation Delay Time  
High to Low Level Output  
Enable to  
Output  
Recommended Operating Conditions  
DM549  
DM74LS139  
Symbol  
Parameter  
Units  
Min  
4.5  
2
ax  
Min  
Nom  
Max  
V
V
V
Supply Voltage  
4.75  
2
5
5.25  
V
V
CC  
High Level Input Voltage  
Low Level Input Voltage  
High Level Output Current  
Low Level Output Current  
Free Air Operg Te
IH  
0.7  
0.8  
V
IL  
b
b
0.4  
I
I
0.4  
mA  
mA  
OH  
OL  
4
8
b
T
A
125  
0
70  
C
§
3
’LS139 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
b
Short Circuit  
DM54  
DM74  
20  
20  
OS  
mA  
mA  
Output Current  
(Note 2)  
b
e
CC  
I
Supply Current  
V
Max (Note 3)  
6.8  
1
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 enabled and open.  
A
CC  
’LS139 Switching Characteristics  
5V and T  
e
e
A
at V  
25 C (See Section 1 for Test Waveforms and Output Ld)  
§
CC  
e
L
2
From (Input)  
e
e
L
Symbol  
Parameter  
C
15 pF  
C
50 pF  
Max  
Units  
To (Output)  
ax  
Min  
t
t
t
t
Propagation Delay Time  
Low to High Level Output  
Select to  
Output  
PLH  
PHL  
PLH  
PHL  
27  
40  
27  
40  
ns  
ns  
ns  
ns  
Propagation Delay Time  
High to Low Level Output  
Select to  
Outpt  
27  
18  
24  
Propagation Delay Time  
Low to High Level Output  
Enabto  
Output  
Propagation Delay Te  
High to Low Level Out
e to  
Function Tables  
LS139  
Y0  
Inputs  
Enable Select  
G1 G2*  
Inputs  
Select  
Outputs  
Enable  
G
C
B
A
Y5 Y6 Y7  
B
A
Y1  
Y2  
Y3  
X
L
H
X
L
L
L
L
L
L
L
L
X
X
L
X
X
L
X
X
L
H
H
L
H
L
H
H
L
H
H
H
L
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
L
L
L
L
X
L
X
L
H
L
H
H
L
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
L
H
H
H
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
e
e
e
Low Level, X Don’t Care  
H
High Level, L  
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
e
a
G2B  
* G2  
G2A  
e
e
e
H
High Level, L  
Low Level, X  
Don’t Care  
4
Logic Diagrams  
LS138  
TL/F/6391–3  
LS139  
TL/F/6391–4  
5
Physical Dimensions inches (millimeters)  
Ceramic Leadless Chip Carrier Package (E)  
Order Number 54LS138LMQB or MQB  
NS Package Number
16-Lead Ceramic Dual-In-Line Package (J)  
Order Number 54LS138DMQB, 54LS139DMQB, DM54LS138J or DM54LS139J  
NS Package Number J16A  
6
Physical Dimensions inches (millimeters) (Continued)  
16-Lead Small Outline Molded ckage
Order Number DM74LS138M or DLS139
NS Packge Number M16A  
16-Lead Molded Dual-In-Line Package (N)  
Order Number DM74LS138N or DM74LS139N  
NS Package Number N16E  
7
Physical Dimensions inches (millimeters) (Continued)  
16-Lead Ceramic Flat Package (W)  
Order Number 54LS138FMQB, 54LS139FMQB, DM54LS138W 9W  
NS Package Number W16A  
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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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